JP6827352B2 - Method for measuring physical characteristics of test pieces and method for measuring Young's modulus of thermal barrier coating layer - Google Patents

Description

The present invention relates to a method for measuring physical characteristics of a test piece and a method for measuring Young's modulus of a heat shield coating layer.

Thermal Barrier Coating (TBC) is applied to the surface of turbine members and the like exposed to high-temperature gas. This thermal barrier coating consists of a metal adhesive layer that is sprayed onto the base metal and a ceramic layer that is sprayed onto the metal adhesive layer. By forming this heat-shielding coating, the heat-shielding property and durability of the turbine member and the like are improved.

Physical property values such as Young's modulus of such a heat-shielding coating affect durability and remaining life. Therefore, the measurement of Young's modulus of the heat shield coating is standardized by, for example, a four-point bending method (JIS H 8454).
Patent Document 1 describes a method of estimating a physical property value that affects the durability and the remaining life of the ceramic layer in order to estimate the durability and the remaining life of the heat shield coating layer. In Patent Document 1, the Larson mirror parameter is calculated from the heating time and the heating temperature of the ceramic layer, and the ceramic layer is calculated from the correlation diagram between the Larson mirror parameter and the porosity and the correlation diagram between the porosity and the physical property value of the ceramic. We are looking for the physical properties of.

Japanese Unexamined Patent Publication No. 2009-236630

However, since the technique described in Patent Document 1 is a method of estimating the physical property value of the ceramic layer at room temperature from the heating time and the heating temperature, there is a problem that the physical property value under a high temperature environment cannot be estimated.
In addition, when acquiring physical property values by the 4-point bending method, it is necessary to attach a strain gauge to the test piece having a heat shield coating layer, but since the strain gauge cannot be used in a high temperature environment, measurement in a high temperature environment There is a problem that it cannot be done.
The present invention has been made in view of the above circumstances, and provides a method for measuring the physical property value of a test piece and a method for measuring the Young's modulus of a heat shield coating layer, which can accurately measure the physical property value even in a high temperature environment. It is a thing.

The following configuration is adopted to solve the above problems.
According to the first aspect of the present invention, the method for measuring the physical property value of the test piece is to obtain the relationship between the stroke amount and the strain by performing a four-point bending method on the test piece provided with the heat shield coating layer and the base material layer. In the stroke-strain relationship acquisition step, the stroke-load relationship acquisition step for acquiring the relationship between the stroke amount and the load by performing a four-point bending method with the test piece heated, and the stroke-strain relationship acquisition step. Strain-load relationship to acquire the relationship between the strain and load of the test piece based on the relationship between the acquired stroke amount and strain and the relationship between the stroke amount and load acquired in the stroke-load relationship acquisition process. Including the acquisition process.
Here, since the relationship between the stroke amount and the strain in the elastic region does not change even in a high temperature environment, it can be measured at room temperature, for example. Since the stroke amount and the load can be measured at a place away from the test piece, the test piece can be measured even in a high temperature environment. Then, the relationship between the strain and the load can be obtained from the relationship between the stroke amount and the strain and the relationship between the stroke amount and the load. Therefore, the relationship between the strain of the test piece and the load can be obtained without measuring the strain in a high temperature environment.
As a result, the physical characteristics of the test piece can be measured accurately even in a high temperature environment.

According to the second aspect of the present invention, in the method for measuring the physical property value of the test piece according to the first aspect, two support rolls arranged at intervals in the first direction are provided, and the first support roll is used. A support base for supporting the test piece from a second direction orthogonal to the direction of the above, and two load rolls arranged inside the two support rolls and spaced apart from each other in the first direction. A load table that sandwiches the test piece in the second direction and applies a load to the test piece by the load roll from a side opposite to the support table, and the support table and the load table in the second direction. A pushing mechanism that pushes at least one of the support base and the load base in the direction of approaching the support base, a load detector that detects the load applied to the support base or the load base, and the pushing mechanism in the second direction. A stroke detector that detects the relative displacement of the load platform with respect to the support platform, a strain detector that detects the strain of the test piece, and the support platform and the load platform are accommodated to raise the internal space. A four-point bending test apparatus including a possible heating furnace may be used to acquire the load, the stroke amount, and the strain of the test piece.
With this configuration, the relationship between the stroke amount and the strain with respect to the test piece can be obtained, for example, by the 4-point bending method using the 4-point bending test apparatus. Further, the relationship between the stroke amount and the load can be obtained by the four-point bending method for the test piece heated by the heating furnace.

According to the third aspect of the present invention, in the method for measuring the physical characteristic value of the test piece according to the second aspect, at least one of the support base and the load base may be formed of ceramic.
With this configuration, it is possible to suppress the influence of the temperature characteristics of the support base and the load base on the measurement result of the physical property value.

According to the fourth aspect of the present invention, in the method for measuring the physical characteristics of the test piece according to the second or third aspect, the stroke detector may be a laser displacement meter.
With this configuration, the stroke amount can be detected more accurately.

According to the fifth aspect of the present invention, in the method for measuring the physical property value of the test piece according to any one of the first to fourth aspects, the relationship between the strain and the load acquired by the strain-load relationship acquisition step is determined. A Young's modulus calculation step of calculating the Young's modulus of the test piece based on the test piece may be included.
With this configuration, the Young's modulus of the test piece can be calculated without measuring the strain of the test piece in a high temperature environment.

According to the sixth aspect of the present invention, it is a method for measuring the Youngness ratio of the heat shield coating layer including the method for measuring the physical property value of the test piece according to the fifth aspect, and the strain and the load are combined by the strain-load relationship acquisition step. A removal step of removing only the heat-shielding coating layer from the test piece for which a relationship has been obtained to obtain a test piece after removal, and a four-point bending method for the test piece after removal are performed to determine the relationship between the stroke amount and strain. The post-removal stroke-strain relationship acquisition step to be acquired, the post-removal stroke-load relationship acquisition step to acquire the relationship between the stroke amount and the load by performing a 4-point bending method with the post-removal test piece heated, and the above. Post-removal stroke-strain relationship The relationship between the stroke amount and strain acquired in the acquisition process and the relationship between the stroke amount and load acquired in the post-removal stroke-load relationship acquisition process, and the post-removal test piece Removal that calculates the Young's ratio of the post-removal test piece based on the relationship between the post-removal strain-load relationship acquisition process that acquires the relationship between strain and load and the strain and load acquired in the above-mentioned strain-load relationship acquisition process. The young rate of the test piece calculated by the post-young rate calculation step, the young rate calculation step, and the young rate of the post-removal test piece calculated by the removal young rate calculation step. It may include a step of calculating the heat shield coating young rate for obtaining the young rate of the heat shield coating layer.
With this configuration, based on the Young's modulus of the test piece having the heat shield coating layer and the Young's modulus of the test piece not having the heat shield coating layer, the Young's modulus of only the heat shield coating layer of the test piece You can find the rate. That is, the Young's modulus of the heat shield coating layer of the test piece can be accurately obtained without measuring the strain in a high temperature environment.

According to the method for measuring the physical characteristic value of the test piece, the physical characteristic value can be measured accurately even in a high temperature environment.

It is a partial cross-sectional perspective view of the 1st test piece in embodiment of this invention. It is a figure which shows the schematic structure of the 4-point bending test apparatus in embodiment of this invention. It is a flowchart of the Young's modulus measurement method of the top coat layer in embodiment of this invention. It is a graph in which the vertical axis is strain (ε) and the horizontal axis is stroke amount (mm). It is a graph in which the vertical axis is a load (kgf) and the horizontal axis is a stroke amount (mm). It is a graph in which the vertical axis is a load (kgf) and the horizontal axis is a strain (ε). It is a figure corresponding to FIG. 2 in the modification of the embodiment of this invention.

Next, a method for measuring the physical characteristics of the test piece and a method for measuring the Young's modulus of the heat shield coating layer according to the embodiment of the present invention will be described with reference to the drawings. There are two types of test pieces in this embodiment, the first test piece 1A and the second test piece 1B. In the following description, when it is not necessary to distinguish between the first test piece 1A and the second test piece 1B, it may be simply referred to as "test piece 1".

FIG. 1 is a partial cross-sectional perspective view of the first test piece according to the embodiment of the present invention.
As shown in FIG. 1, the first test piece 1A is formed by simulating the surface of a turbine blade or the like of a gas turbine. The first test piece 1A includes a base material layer 10 and a coat layer 11.

A heat-resistant alloy such as a nickel (Ni) -based alloy can be used for the base material layer 10. The base material layer 10 may have sufficient rigidity so as not to cause plastic deformation during the test described later.
The coat layer 11 is formed on one surface (lower surface in FIG. 1) of the base material layer 10. The coat layer 11 includes a bond coat layer 12 and a top coat layer 13.

The bond coat layer 12 suppresses the top coat layer 13 from peeling off from the base material layer 10. The bond coat layer 12 is a metal bonding layer having excellent corrosion resistance and oxidation resistance. The bond coat layer 12 can be formed, for example, by spraying a metal spray powder of MCrAlY alloy as a spray material onto the surface of the base material layer 10. Here, "M" of the MCrAlY alloy constituting the bond coat layer 12 indicates a metal element. The metal element "M" is composed of, for example, a single metal element such as Ni or Co, or a combination of two or more of these.

The top coat layer 13 is laminated on the surface of the bond coat layer 12. The top coat layer 13 can be formed by spraying a thermal spray material containing ceramic onto the surface of the bond coat layer 12. A zirconia-based ceramic can be used as the thermal spraying material used when forming the top coat layer 13. Examples of the zirconia-based ceramic include yttria-stabilized zirconia (YSZ) and ytterbium-stabilized zirconia (YbSZ), which is zirconia (ZrO ₂ ) partially stabilized with ytterbium oxide (Yb ₂ O ₃ ).

In the first test piece 1A illustrated in this embodiment, the coat layer 11 is arranged on the back surface (lower surface in FIG. 1), and the base material layer 10 is arranged on the front surface (upper surface in FIG. 1). That is, the metal forming the base material layer 10 is exposed on the surface side of the first test piece 1A. The thickness of the base material layer 10 in this embodiment may be formed to be, for example, the same thickness as the base material of the turbine blade of the gas turbine which is an actual machine.

The second test piece 1B is obtained by removing the top coat layer 13 from the first test piece 1A described above. That is, the second test piece 1B has the same configuration as the first test piece 1A except that the top coat layer 13 is removed. Therefore, the detailed description of the second test piece 1B will be omitted.
The test piece 1 illustrated in this embodiment is formed in the shape of a rectangular plate.

FIG. 2 is a diagram showing a schematic configuration of a four-point bending test apparatus according to an embodiment of the present invention.
As shown in FIG. 2, the four-point bending test apparatus 20 includes a four-point bending jig portion 21, a pushing mechanism 22, a load detector 23, a stroke detector 24, a strain detector 25, and a heating furnace. 26 and, respectively.
The four-point bending test apparatus 20 determines the relationship between strain and load in a high temperature environment for the above-mentioned first test piece 1A and second test piece 1B by a four-point bending method (for example, JIS H 8454). Various measurements are possible. In this embodiment, the Young's modulus of the first test piece 1A in the high temperature environment and the second in the high temperature environment are obtained from the relationship between the strain and the load in the high temperature environment obtained from the test results of the 4-point bending test apparatus 20. The Young's modulus of the test piece 1B is calculated respectively.

The 4-point bending jig portion 21 can support the test piece 1 by sandwiching it. The four-point bending jig portion 21 includes a support base 30, a load base 31, a first rod R1, and a second rod R2. The 4-point bending jig portion 21 may be formed of, for example, a material such as ceramic, which is less affected by the temperature rise, like the top coat layer 13. The four-point bending jig portion 21 in this embodiment supports the test piece 1 in a posture in which the front and back surfaces thereof spread in the horizontal direction. Further, in this embodiment, the case where the support base 30 is arranged below and the load base 31 is arranged above is illustrated, but the arrangement is not limited to this.

The support base 30 in this embodiment supports the test piece 1 from below. The support base 30 includes a support base main body 32 and two support rolls 33.
The support base main body 32 is formed in a U shape that opens upward in the front view shown in FIG. In other words, the support base main body 32 includes two support arm portions 32a that project upward and are separated from each other in the first direction D1 of the horizontal direction Dh. The upper end surfaces 32b of these support arm portions 32a are arranged at the same positions in the vertical direction Dv.

One support roll 33 is formed on each of the upper end surfaces 32b of the two support arm portions 32a, and the support rolls 33 are arranged at intervals of a predetermined distance L1 in the first direction D1. These support rolls 33, together with the load roll 35 described later, support the test piece 1 from the second direction D2 orthogonal to the first direction D1. The second direction D2 in this embodiment coincides with the vertical direction Dv.

These support rolls 33 project from the upper end surface 32b in the second direction D2 and extend in the third direction D3 (the front and back directions of the paper surface of FIG. 2) orthogonal to the first direction D1 in the horizontal direction Dh. The support roll 33 has a semicircular shape in which the upper end portion 33a thereof is convex upward in the front view shown in FIG. The support roll 33 illustrated in this embodiment is arranged on the innermost side of the upper end surfaces 32b of the two support arm portions 32a, but is not limited to this arrangement.

The load base 31 can apply a load to the test piece 1 from above, which is opposite to the support base 30 in the second direction D2 with the test piece 1 in between. The load base 31 includes a load base main body 34 and two load rolls 35.
The load base main body 34 is formed in a U shape that opens downward in the front view shown in FIG. In other words, the load base body 34 includes two load arm portions 34a that project downward and are separated from each other in the first direction D1. The lower end surfaces 34b of these load arm portions 34a are arranged at the same positions in the vertical direction Dv.

One load roll 35 is formed on each of the lower end surfaces 34b of the two load arm portions 34a. These load rolls 35 are arranged apart by a predetermined distance L2 (for example, about 1/3 of the predetermined distance L1) smaller than the predetermined distance L1 in the first direction D1. The center lines O2 of the two load rolls 35 in the first direction D1 are arranged at the same positions in the first direction D1 with respect to the center lines O1 of the two support rolls 33 in the first direction D1. ..

These load rolls 35 project from the lower end surface 34b in the second direction D2 and extend in the third direction D3 orthogonal to the first direction D1 in the horizontal direction Dh. In the front view shown in FIG. 2, the load roll 35 has a semicircular shape in which the lower end portion 35a thereof is convex downward. The semicircle of the load roll 35 and the semicircle of the support roll described above are formed with the same radius (about 2.0 mm to 3.0 mm), respectively. The support roll 33 illustrated in this embodiment is arranged on the innermost side of the lower end surfaces 34b of the two load arm portions 34a, but is not limited to this arrangement.

The pushing mechanism 22 is capable of pushing at least one of the support base 30 and the load base 31 in the direction in which the support base 30 and the load base 31 are brought closer to each other in the second direction D2. The pushing mechanism 22 in this embodiment presses the support base 30 in the direction approaching the load base 31, that is, upward, while maintaining the position of the load base 31. The pushing mechanism 22 in this embodiment is connected to a first rod R1 extending downward from the support base 30 and a second rod R2 extending upward from the load base 31, respectively. By this pushing mechanism 22, the support base 30 and the load base 31 are pushed in the direction of approaching each other in the second direction D2, and a load can be applied to the test piece 1 in the second direction D2. The pushing operation by the pushing mechanism 22 is performed, for example, by controlling the stroke amount (for example, 1/200 mm pitch).

The load detector 23 detects the load applied to the support base 30 or the load base 31. More specifically, the load detector 23 detects the load applied to the support base 30 or the load base 31 in the second direction D2. The load detector 23 illustrated in this embodiment is attached to the first rod R1 that supports the load base 31. A load cell can be used as the load detector 23. The load detection result by the load detector 23 may be displayed on a display (not shown) connected to the load detector 23, or may be printed by a printing machine, for example. Further, the load detection result by the load detector 23 may be recorded on a recording medium (hereinafter, the same applies to the stroke detector 24).

The stroke detector 24 detects the stroke amount due to the pushing operation of the pushing mechanism 22. As the stroke detector 24, for example, a differential transformer type extensometer (DTF) can be used. The stroke detector 24 illustrated in this embodiment is attached to the pushing mechanism 22 to detect the stroke amount due to the pushing operation of the pushing mechanism 22. This stroke amount can also be said to be the relative displacement amount between the load base 31 and the support base 30 in the second direction D2.

The strain detector 25 detects the strain of the test piece 1. The strain detector 25 includes a strain gauge 25a and a dynamic strain gauge (not shown). The strain gauge 25a is attached to the surface of the top coat layer 13 of the first test piece 1A. The strain gauge 25a is preferably attached near the center of the surface of the top coat layer 13. The strain gauge 25a is connected to a dynamic strain gauge (not shown) via gauge wiring (not shown). The dynamic strain gauge (not shown) amplifies the output of the strain gauge 25a to obtain the strain (in other words, dynamic strain) of the test piece 1, and displays data, records data, and the like.

The heating furnace 26 accommodates the support base 30 and the load base 31 in the internal space 36. The heating furnace 26 can raise the temperature of the test piece 1 sandwiched between the support base 30 and the load base 31 by raising the temperature of the internal space 36 (for example, 1000 ° C. or higher). As the heating furnace 26, an electric furnace or the like can be used. The heating furnace 26 has a penetrating portion 26a through which the first rod R1 and the second rod R2 can penetrate, above and below. As a result, while the test piece 1 is heated in the internal space 36 of the heating furnace 26, the support base 30 and the load base 31 can be displaced so as to approach each other in the second direction D2 by the pushing mechanism 22.
The load detector 23 and the stroke detector 24 described above are installed outside the heating furnace 26. The above-mentioned four-point bending test apparatus illustrates a case where a thermocouple 37 is attached to the load table 31 in order to monitor the temperature inside the heating furnace 26, that is, the temperature of the test piece 1. .. However, the detection of the temperature of the test piece 1 is not limited to the thermocouple 37. For example, a laser thermometer, a thermoviewer, or the like may be used.

The four-point bending test apparatus 20 in this embodiment has the above-described configuration. Next, a method for measuring the physical characteristics of the test piece and a method for measuring the Young's modulus of the heat shield coating layer using the four-point bending test apparatus 20 will be described with reference to the drawings.
FIG. 3 is a flowchart of a method for measuring Young's modulus of the top coat layer according to the embodiment of the present invention.
First, as a preparatory step (not shown), a strain gauge 25a is attached to the first test piece 1A, and the first test piece 1A is sandwiched between the support base 30 and the load base 31. At this time, for example, a low pressure prescale or the like may be used to check the contact state of the first test piece 1A and the support base 30, and the contact state of the first test piece 1A and the load base 31.

Next, as shown in FIG. 3, a 4-point bending method is performed on the first test piece 1A, and a stroke-strain relationship acquisition step for acquiring the relationship between the stroke amount and the strain is performed (step S01). This stroke-strain relationship acquisition step is performed in a temperature environment where a strain gauge can be used, such as room temperature. In this stroke-strain relationship acquisition step, the relationship between the stroke amount detected by the stroke detector 24 and the strain detected by the strain detector 25 is acquired while performing the pushing operation by the pushing mechanism 22.

FIG. 4 is a graph in which the vertical axis is strain (ε) and the horizontal axis is stroke amount (mm).
As shown in FIG. 4, the relationship between the strain acquired in the stroke-strain relationship acquisition step and the stroke amount is a linear relationship in which the strain increases as the stroke amount increases.

Next, in a state where the temperature of the first test piece 1A is raised by the heating furnace 26 (for example, 1000 ° C. or higher), the 4-point bending method is performed again to acquire the relationship between the stroke amount and the load. Stroke-load relationship The acquisition step is performed (step S02). In this stroke-load relationship acquisition step, the relationship between the stroke amount detected by the stroke detector 24 and the load detected by the load detector 23 is acquired while performing the pushing operation by the pushing mechanism 22. Before raising the temperature of the first test piece 1A by the heating furnace 26, the gauge wiring is removed from the strain gauge 25a, and the stroke-load relationship acquisition step is performed.

FIG. 5 is a graph in which the vertical axis is the load (kgf) and the horizontal axis is the stroke amount (mm).
As shown in FIG. 5, the relationship between the stroke amount acquired in the stroke-load relationship acquisition step and the load is such that the load value decreases as the stroke amount increases. The relationship between the stroke amount acquired in the stroke-load relationship acquisition process and the load is linear.
Here, in the load detector 23 in this embodiment, the load acting in the compression direction is detected as a negative value. That is, as for the relationship between the stroke amount acquired in the stroke-load relationship acquisition step and the load, in reality, the larger the load, the larger the load acting on the load detector 23.

Next, the strain of the first test piece 1A is based on the relationship between the stroke amount and the strain acquired in the stroke-strain relationship acquisition process and the relationship between the stroke amount and the load acquired in the stroke-load relationship acquisition process. The strain-load relationship acquisition step for acquiring the relationship with the load is performed (step S03). In this strain-load relationship acquisition process, for example, the relationship between the stroke amount acquired at room temperature and the strain is applied to the relationship between the stroke amount acquired at high temperature and the load, and the relationship between the load and the strain is obtained. get. In other words, using the relationship between the stroke amount and the load and the relationship between the stroke amount and the strain, for example, the stroke amounts of each other are replaced with the load or the strain to obtain the relationship between the load and the strain. Here, the relationship between the stroke amount and the strain described above does not change with temperature in the elastic region. Therefore, even if the relationship between the stroke amount and the strain is acquired in a high temperature environment, the result is the same as the relationship between the stroke amount and the strain acquired at room temperature or the like.

FIG. 6 is a graph in which the vertical axis is the load (kgf) and the horizontal axis is the strain (ε).
The graph of the load and the strain shown in FIG. 6 can be obtained from the graph shown in FIG. 4 and the graph shown in FIG. Here, in FIG. 6, as in FIG. 5, the load in the direction of compressing the test piece 1 is detected as a negative value. Therefore, also in FIG. 6, the load value becomes smaller as the strain becomes larger. That is, in reality, the smaller the load value, the larger the load acting on the load detector 23. As shown in FIG. 6, the relationship between these loads and strains is linear.

Next, a Young's modulus calculation step of calculating the Young's modulus of the first test piece 1A based on the relationship between the strain and the load acquired in the strain-load relationship acquisition step is performed (step S04). More specifically, the Young's modulus of the first test piece 1A is calculated by the beam theory from the relationship between the strain and the load acquired in the strain-load relationship acquisition step (see, for example, JIS H8454).

Further, after stopping the temperature rise by the heating furnace 26 to lower the temperature of the first test piece 1A, the first test piece 1A is taken out from the 4-point bending test apparatus, and the top coat layer of the first test piece 1A is taken out. A removal step of removing only 13 is performed (step S05). In this removing step, for example, the top coat layer 13 is removed by a blast treatment to obtain a second test piece 1B. After that, the Young's modulus is calculated for the second test piece 1B through the same steps as for the first test piece 1A described above.

That is, first, the strain gauge 25a is attached to the second test piece 1B, and the second test piece 1B is sandwiched between the support base 30 and the load base 31. At this time, the strain gauge 25a is attached to the bond coat layer 12 or the base material layer 10 instead of the top coat layer 13.
Next, a 4-point bending method is performed on the second test piece 1B, and a post-removal stroke-strain relationship acquisition step for acquiring the relationship between the stroke amount and the strain is performed (step S06). This post-removal stroke-strain relationship acquisition step is performed in a temperature environment where a strain gauge can be used, such as room temperature. In this post-removal stroke-strain relationship acquisition step, the relationship between the stroke amount detected by the stroke detector 24 and the strain detected by the strain detector 25 is acquired while performing the pushing operation by the pushing mechanism 22.

Next, in a state where the temperature of the second test piece 1B is raised by the heating furnace 26 (for example, 1000 ° C. or higher), the four-point bending method is performed again to obtain the relationship between the stroke amount and the load. The load relationship acquisition step is performed (step S07). In this post-removal stroke-load relationship acquisition step, the relationship between the stroke amount detected by the stroke detector 24 and the load detected by the load detector 23 is acquired while performing the pushing operation by the pushing mechanism 22. ..

Next, the second test piece is based on the relationship between the stroke amount and the strain acquired in the post-removal stroke-strain relationship acquisition process and the relationship between the stroke amount and the load acquired in the post-removal stroke-load relationship acquisition process. The post-removal strain-load relationship acquisition step of acquiring the relationship between the strain and the load of 1B is performed (step S08).

Further, a post-removal Young's modulus calculation step of calculating the Young's modulus of the second test piece 1B based on the relationship between the strain and the load acquired in the post-removal strain-load relationship acquisition step is performed (step S09). More specifically, the Young's modulus of the second test piece 1B is calculated by the beam theory from the relationship between the strain and the load acquired in the post-removal strain-load relationship acquisition step (see, for example, JIS H8454).

After that, only the Young's modulus of the first test piece 1A calculated in the Young's modulus calculation step (step S04) and the top coat layer 13 calculated in the post-removal Young's modulus calculation step (step S09) were removed. A heat shield coating Young's modulus calculation step (step S10) for obtaining the Young's modulus of the top coat layer 13 is performed based on the Young's modulus of 1B. The Young's modulus of the top coat layer 13 can be obtained by the equation (2) of JIS H8454. In this case, the second test piece 1B having no top coat layer 13 is referred to as a "base material", and the first test piece 1A including the top coat layer 13 is referred to as "BC".

Therefore, according to the above-described embodiment, the strain and the load are based on the relationship between the stroke amount and the strain that can be measured at room temperature and the stroke amount and the load that can be measured at a place away from the test piece 1 in a high temperature environment. The relationship with can be found. Therefore, the relationship between the strain of the test piece 1 and the load can be obtained without measuring the strain of the test piece 1 in a high temperature environment. As a result, the physical property value of the test piece 1 can be accurately measured even in a high temperature environment.

Further, since the Young's modulus of the test piece 1 can be calculated based on the relationship between the acquired strain and the load, the Young's modulus of the test piece 1 can be accurately measured without measuring the strain of the test piece 1 in a high temperature environment. Can be calculated.

Further, by the 4-point bending method using a 4-point bending test apparatus, for example, the relationship between the stroke amount and the strain with respect to the test piece 1 can be easily obtained at room temperature. Further, the relationship between the stroke amount and the load with respect to the test piece 1 heated by the heating furnace 26 can be obtained by the 4-point bending method using the 4-point bending test apparatus.

Further, when the four-point bending jig portion 21 is made of ceramic, it is possible to suppress the influence of the temperature characteristics of the support base 30 and the load base 31 on the measurement result of the physical property value.

Further, the Young's modulus of only the top coat layer 13 is obtained based on the Young's modulus of the first test piece 1A having the top coat layer 13 and the Young's modulus of the second test piece 1B having no top coat layer 13. be able to. That is, the Young's modulus of only the top coat layer 13 of the first test piece 1A can be accurately obtained without measuring the strain in a high temperature environment.

(Modified example of embodiment)
FIG. 7 is a diagram corresponding to FIG. 2 in a modified example of the embodiment of the present invention.
For example, in the above-described embodiment, a case where a differential transformer type extensometer (DTF) is used as the stroke detector 24 has been described.
However, as shown in FIG. 7, for example, a laser displacement meter may be used as the stroke detector 24B. The stroke detector 24B detects the stroke amount of the pushing mechanism 22 by, for example, irradiating the target 40 arranged on the outer surface of the heating furnace 26 with a laser beam and detecting the reflected light.
By using the laser displacement meter as the stroke detector 24B in this way, the stroke amount can be detected more accurately. As a result, the Young's modulus of the topcoat layer 13 can be measured more accurately.

The present invention is not limited to the configuration of the above-described embodiment, and the design can be changed without departing from the gist thereof.

1 Test piece 10 Base material layer 11 Coat layer 12 Bond coat layer 13 Top coat layer (heat shield coating layer)
20 4-point bending test device 21 4-point bending jig 22 Pushing mechanism 23 Load detector 24, 24B Stroke detector 25 Strain detector 25a Strain gauge 26 Heating furnace 26a Penetration part 30 Support base 31 Load base 32 Support base body 32a Support arm 32b Upper end surface 33 Support roll 33a Upper end 34 Load base body 34a Load arm 34b Lower end surface 35 Load roll 35a Lower end 36 Internal space 40 Target R1 First rod R2 Second rod

Claims (6)

A stroke-strain relationship acquisition process for acquiring the relationship between stroke amount and strain by performing a 4-point bending method on a test piece having a heat shield coating layer and a base material layer.
A stroke-load relationship acquisition process for acquiring the relationship between the stroke amount and the load by performing a four-point bending method with the test piece heated.
The strain and load of the test piece are based on the relationship between the stroke amount and the strain acquired in the stroke-strain relationship acquisition step and the relationship between the stroke amount and the load acquired in the stroke-load relationship acquisition step. Strain-load relationship acquisition process to acquire relationship and
A method for measuring physical characteristics of a test piece including. A support base provided with two support rolls spaced apart from each other in the first direction and supporting the test piece from a second direction orthogonal to the first direction by the support rolls.
It includes two load rolls arranged inside the two support rolls and spaced apart from each other in the first direction, with the test piece sandwiched in the second direction and opposite to the support base. With a load table that applies a load to the test piece with the load roll
A pushing mechanism that pushes at least one of the support base and the load base in a direction that brings the support base and the load base closer to each other in the second direction.
A load detector that detects the load applied to the support base or the load base, and
A stroke detector that detects the relative displacement of the load platform with respect to the support platform in the second direction by the pushing mechanism, and
A strain detector that detects the strain of the test piece and
A heating furnace capable of accommodating the support base and the load base and raising the temperature of the internal space,
The method for measuring a physical characteristic value of a test piece according to claim 1, wherein the load, the stroke amount, and the strain of the test piece are acquired by using a four-point bending test device. The method for measuring a physical characteristic value of a test piece according to claim 2, wherein at least one of the support base and the load base is made of ceramic. The method for measuring a physical characteristic value of a test piece according to claim 2 or 3, wherein the stroke detector is a laser displacement meter. The test piece according to any one of claims 1 to 4, which includes a Young's modulus calculation step of calculating the Young's modulus of the test piece based on the relationship between the strain and the load acquired in the strain-load relationship acquisition step. Physical property value measurement method. A method for measuring Young's modulus of a heat-shielding coating layer, which comprises the method for measuring physical characteristics of a test piece according to claim 5.
A removal step of obtaining a test piece obtained by removing only the heat shield coating layer from the test piece obtained by acquiring the relationship between strain and load by the strain-load relationship acquisition step.
A post-removal stroke-strain relationship acquisition step for acquiring the relationship between the stroke amount and strain by performing a 4-point bending method on the test piece from which only the heat shield coating layer has been removed,
A post-removal stroke-load relationship acquisition step for acquiring the relationship between the stroke amount and the load by performing a 4-point bending method in a state where the temperature of the test piece from which only the heat shield coating layer has been removed has been raised.
The heat shield coating layer is based on the relationship between the stroke amount and the strain acquired in the post-removal stroke-strain relationship acquisition step and the relationship between the stroke amount and the load acquired in the post-removal stroke-load relationship acquisition step. The post-removal strain-load relationship acquisition process to acquire the relationship between the strain and load of the test piece from which only the test piece has been removed,
A post-removal Young's modulus calculation step of calculating the Young's modulus of a test piece from which only the heat shield coating layer has been removed based on the relationship between the strain and the load acquired in the strain-load relationship acquisition step.
Based on the Young's modulus of the test piece calculated by the Young's modulus calculation step and the Young's modulus of the test piece obtained by removing only the thermal barrier coating layer calculated by the Young's modulus calculation step after removal, the shield. The process of calculating the Young's modulus of the thermal barrier coating to obtain the Young's modulus of the thermal coating layer, and
A method for measuring Young's modulus of a heat shield coating layer including.

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