JP3356415B2 - Film evaluation test method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film evaluation test method for measuring and evaluating characteristics of a film formed on a surface of a metal material, a synthetic resin material or the like.

[0002]

2. Description of the Related Art Metal materials such as gears and synthetic resin materials are used for improving the surface strength, abrasion resistance, corrosion resistance, and other surface modification. Various techniques have been proposed for providing a film on the surface of a synthetic resin material by a method such as plating, coating, diffusion infiltration, vapor deposition, or thermal spraying.

[0003] Incidentally, since this film is originally provided for the purpose of improving strength, abrasion resistance and corrosion resistance, the film is rubbed or corroded so that the actual film thickness is reduced. It is difficult to evaluate various mechanical properties such as mechanical properties such as strength, abrasion, and corrosion resistance.

[0004] For example, a blast erosion method has been proposed as a method for measuring the characteristics of this film.

In the blast erosion method, weight loss per unit time of a test object is measured by blowing abrasive grains together with compressed air, and the weight loss is divided by the bulk specific gravity of the film. When determining the weight loss, this unit time and volume loss are in a proportional relationship represented by a linear graph,
Since the gradient of this straight line (called erosion characteristic) shows a good relationship with the tensile strength, elongation, hardness, and fracture toughness value, by measuring the weight loss, it is easy to evaluate the film whose characteristics are difficult to evaluate in a short time. There is an advantage that it can be performed.

However, in the blast erosion method, since abrasive grains are easily scattered, the abrasive grains that can be handled have a diameter of several hundred μm or more, and a thin film of several tens μm or less formed by vapor deposition or sputtering. However, there is a problem that the characteristics cannot be evaluated.

Further, since the apparatus used for the blast erosion method is apt to cause the abrasive grains and the shavings of the subject to scatter in the air and flutter, the abrasive chamber and the like are prevented from leaking out of the injector chamber. In addition, it is necessary to increase the airtightness of the filter, and it is also necessary to attach a device such as a dust collecting filter or a cyclone for collecting abrasives, etc., which leads to a problem that the entire device is large, complicated, and expensive. is there.

In addition, since the abrasive grains continue to fly for a while after the injection material is injected, the abrasive grains may be scattered outside when the injection chamber is opened immediately after the test is completed to take out the test piece. Therefore, when removing the test piece after the test, it is necessary to wait until the abrasive grains flowing in the injection chamber are completely removed, so that there is a problem that one measurement takes a long time.

Further, in the method of mixing abrasive grains into compressed air, the impact force at which the abrasive grains collide with the test subject is affected by humidity, and the higher the humidity, the greater the error. There is also a problem that the spray chamber must be set to a constant humidity every time, and the test operation is extremely complicated and troublesome.

The present invention has been made in view of the above-mentioned problems, and can evaluate the characteristics of a thin film having a thickness of several tens μm or less.
Extremely innovative film evaluation that can measure abrasion in a very short time in a very simple operation procedure, has a small measurement error and is excellent in reproducibility, and can also reduce the size of the device.
It provides a test method .

[0011]

The gist of the present invention will be described with reference to the accompanying drawings.

A method for evaluating the characteristics of a film formed on the surface of a subject 1 such as a metal material or a synthetic resin material ,
A fixing mechanism 3 for fixing the subject 1, and an injection mechanism 5 for reducing the amount of the subject 1 by jetting an blasting material 4 in which abrasive grains are mixed with liquid to the subject 1 fixed to the fixing mechanism 3 together with compressed air.
The film evaluation tester 2 having the following formula is adopted, and the abrasive having a maximum particle size of 25 μm or less is used as the abrasive, and the spray mechanism 5
The injection material 4 together with the compressed air to reduce the weight of the subject 1
Causal relationship between the weight loss of subject 1 and the time required for the weight loss
And the film formed on the surface of the specimen 1 and the mother
Evaluate boundary characteristics such as adhesion and bonding strength at the interface with the material
The present invention relates to a film evaluation test method characterized in that:

In addition, a test object 1 such as a metal material or a synthetic resin material is used.
This is a method to evaluate the characteristics of the film formed on the surface of
Thus , a fixing mechanism 3 for fixing the subject 1, and the blasting material 4 in which abrasive particles are mixed with the liquid in the subject 1 fixed to the fixing mechanism 3
And a spraying mechanism 5 having a spraying mechanism 5 for spraying together with compressed air to reduce the amount of the subject 1, employing a maximum grain size of 25 μm or less as the abrasive grain, Injection machine
The injection material 4 is ejected from the structure 5 together with the compressed air, and the subject 1 is ejected.
Causal relationship between the weight loss of the subject 1 and the time required for the weight loss
Measuring the relationship, the multilayer formed on the surface of the specimen 1
The adhesiveness of the interface between the films or between the film and the base material
Coating characterized by evaluating boundary properties such as adhesive strength
It relates to an evaluation test method .

Further, according to any one of claims 1 and 2,
In the coating evaluation test method, the spraying material 4 is obtained by mixing abrasive grains made of resin grains, metal grains, ceramic grains, or glass grains into an aqueous solution such as water or alkali, or a solvent such as alcohol. Is provided with a turning mechanism 6 which can turn the subject 1 fixed to the fixing mechanism 3 to adjust the contact angle between the spray material 4 and the subject 1. Even if the subject 1 fixed to the fixing mechanism 3 is positioned on the axis line and the subject 1 is rotated, the ejection moving distance of the ejection material 4 ejected to the subject 1 does not change even if the subject 1 is rotated. A collection mechanism 7 is provided below the subject 1 fixed to the fixing mechanism 3 to collect the sprayed material 4 sprayed from the spray mechanism 5 to the subject 1. The collection mechanism 7 includes: The liquid of the blast material 4 and the abrasive grains in the collection mechanism 7 are mixed at a substantially constant ratio. Stirring mechanism 9 for mixing so that uniform is provided, the ejection mechanism 5 and the recovery mechanism 7 is connected by Ryusuru flow sending mechanism 8 feeding the injection material 4, subject 1
Is set so as to be injected again to the subject 1 together with the compressed air from the injection mechanism 5 via the recovery mechanism 7 and the flow sending mechanism 8, and the injection material 4, the compressed air, The present invention relates to a coating evaluation test method , characterized in that a pressure adjusting mechanism 16 for adjusting the spray pressure is provided.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention (how to implement the invention) which is considered to be preferable will be described with reference to the drawings, showing its operation and effects.

The spray material 4 which is jetted at high speed together with the compressed air collides with the surface of the test object 1, and the film formed on the surface of the test object 1 and the test object 1 itself (base material) are reduced.

At this time, since the abrasive 4 injected to the subject 1 is a mixture of abrasives in a liquid, there is no danger of scattering into the air, and small abrasives of 25 μm or less can be used. Thus, even for a thin film having a thickness of several tens μm or less, the characteristics can be evaluated by gradually reducing the amount of the film.

Further, when the propellant 4 in which the abrasive grains are mixed with the liquid and the compressed air are jetted together to the subject 1, the coating of the subject 1 can be reduced in a short time, and the influence of moisture and the like can be reduced. Since it is not received, it is easy to control, the measurement error is small, and the reproducibility is good.

Further, when a film evaluation test was actually performed, the weight loss time and the weight loss volume (measured by wear depth in the example)
Correlation with draw a straight line graph of different gradients in the coating part and the base material part, furthermore, depending on the material of the coating and the base material, a vertical gradient appears at the connection part of both linear graphs, or this linear gradient, Appearing at the boundary between the coating and the base material,
It appeared on the side of the film, and it was confirmed that the properties, material, interface adhesion and adhesive strength of the film could be evaluated.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings.

The present embodiment is a film evaluation tester 2 for measuring characteristics of a film formed on the surface of a test object 1 such as a metal material or a synthetic resin material, and a fixing mechanism 3 for fixing the test object 1. And an injection mechanism 5 for injecting, along with compressed air, an injection material 4 in which abrasive grains are mixed with the test object 1 fixed to the fixing mechanism 3 to reduce the amount of the test object 1. .

Abrasive grains having a maximum grain size of 25 μm or less are employed. Further, the abrasive grains having a maximum particle size of 1 μm or less may be adopted so that even a thin film having a thickness of several μm or less can be reduced with good reproducibility.

Further, as the abrasive grains, fine particles of synthetic resin, metal, ceramics, glass and the like are employed. The abrasive grains may be appropriately selected depending on the type of the film and the base material of the subject 1. For example, if the coating or the base material is a soft material, the use of hard abrasive grains causes the weight loss to proceed quickly and the error increases, so employ abrasive grains of a soft material such as synthetic resin, and use a diamond coating. In the case of a hard material such as a coating, soft abrasive grains take too much time to reduce the weight, so it is preferable to use abrasive grains of a hard material such as alumina.

The abrasives are dispersed in water to form a slurry, which constitutes the spray material 4. In addition to water, depending on the purpose, for example, an aqueous solution of an alkali or the like may be used for degreasing, or a solvent such as an alcohol may be used.

The spraying mechanism 5 comprises a spray nozzle 18 for spraying the spray material 4, and a mixing chamber 19 for spraying the spray material 4 from the spray nozzle 18 together with compressed air.

The fixing mechanism 3 is provided with a fastener 17.
The fastener 17 is configured to fasten and fix both ends of the subject 1.

The rotating mechanism 6 is provided in the fixing mechanism 3. The turning mechanism 6 is provided with a turning shaft 10 at each end of the fixing mechanism 3 for turning the fastener 17 and operating a turning knob 11 provided at an appropriate position of the film evaluation test machine 2. When the rotating shaft 10 is rotated, the subject 1 facing the spray 4 against the spray 4 injected from the spray mechanism 5
It is configured such that the angle of the surface can be changed.

The turning mechanism 6 includes a turning shaft 10 for turning the fixing mechanism 3 and a subject 1 fixed to the fixing mechanism 3.
Are arranged so as to be substantially in line with the test surface, so that even if the test object 1 is rotated, the jetting movement distance of the jetting material 4 jetted to the test object 1 does not change. In the drawing, reference numeral 3a denotes projections provided on the left and right sides of the fixing mechanism 3, and the fixing mechanism 3 and the rotating shaft 10 are connected to each other at the projections 3a to rotate the subject 1. The configuration is such that, when moved, the ejection movement distance of the ejection material 4 ejected to the subject 1 does not change.

Below the subject 1 fixed to the fixing mechanism 3, there is provided a collecting mechanism 7 for collecting the blasting material 4 falling on the subject 1.

The collecting mechanism 7 is configured as a water tank having a downward tapered shape, and is set so as to collect and collect the sprayed material 4 which has been sprayed and dropped from the spraying mechanism 5. A feed mechanism 8 communicating with the injection mechanism 5 is connected to the inside of the recovery mechanism 7, and the injection material 4 injected from the injection mechanism 5 is configured to be circulated in the apparatus.

Further, the recovery mechanism 7 is provided with a stirring mechanism 9 composed of stirring blades, which stirs the propellant 4 accumulated in the recovery mechanism 7 and mixes the water and the abrasive grains constituting the propellant 4 with each other. Is maintained in a dispersed state in which the concentration distribution is uniform and constant.

At the lowermost position of the collecting mechanism 7, there is provided a discharge section 20 for discharging the blasting material 4 when the blasting material 4 is contaminated by abrasion powder or the like.

In the drawing, reference numeral 12 denotes a transparent cover made of resin for preventing the blasting material 4 from scattering outside (the appearance of each part in the apparatus can be seen well because the cover 12 is transparent). 13 is a start button for injecting the spray material 4, 14 is a timer, 15 is a pressure gauge, and 16 is a pressure adjusting operation unit for adjusting the pressure of compressed air for spraying the spray material 4 from the spray nozzle 18.

Hereinafter, a specific method of using the present embodiment will be described in detail.

The subject 1 is previously processed into a predetermined shape (a shape that can be attached to and detached from the fixing mechanism 3), and the surface shape of the coating of the subject 1 is measured. As a means for measuring the surface shape, a stylus roughness meter is preferably used.

On the other hand, the coating evaluation tester 2 opens the lid 12 and puts predetermined amounts of water and abrasive grains as the blasting material 4 into the water tank as the recovery mechanism 7.

Subsequently, the lid 12 is closed, the timer 14 is set at an appropriate time, and the start button 13 is operated to inject the injection material 4 together with the compressed air from the injection mechanism 5. At this time, the jetting material 4 is stirred by the stirring mechanism 9 in the collection mechanism 7.

Subsequently, the apparatus waits until the injection of the injection material 4 is stabilized, and operates the pressure adjustment operation section 16 to adjust the injection pressure to a predetermined injection pressure. Further, the sprayed material 4 is collected, the concentration of the sprayed material 4 is measured, and it is confirmed whether or not the sprayed material 4 being sprayed from the spray nozzle 18 has a predetermined concentration (abrasive / water). Keep it.

Subsequently, the start button 13 is operated to stop the injection.

Subsequently, the lid 12 is opened, and the subject 1 is fixed to the fixing mechanism 3.

Subsequently, the cover 12 is closed, a timer 14 is set at a predetermined injection time, and after confirming that the concentration of the injection material 4 is constant by the stirring mechanism 9, the start button 13 is operated. To start the test.

During the test, the blasting material 4 and the compressed air are blasted together from the blasting mechanism 5 toward the test subject 1, and the surface (film or base material) of the test subject 1 is exposed to water and abrasive grains for a predetermined time. And a little by the synergistic effect of compressed air
Weight loss. At this time, the blast material 4 is blasted from the blast mechanism 5 and collides with the surface of the subject 1, scrapes off a part of the film or the base material and falls into the collection mechanism 7. The water and the abrasive grains constituting the blasting material 4 are stirred by the stirring mechanism 9 in the collecting mechanism 7 so that the abrasive grains are kept from settling under the collecting mechanism 7 and are kept at a uniform and predetermined concentration. The spray material 4 is again sent to the spray mechanism 5 by the flow mechanism 8 provided in the recovery mechanism 7 and circulates in the apparatus.

When the injection of the injection material 4 is completed after a predetermined time has elapsed, the lid 12 is opened and the subject 1 is taken out.
The propellant 4 attached to the sample 1 is washed away, and the subject 1 is dried.

Subsequently, the surface shape of the film of the subject 1 is measured again to measure the maximum wear depth, and the relationship between the wear time and the wear depth is graphed (for example, see FIGS. 3 to 6). Also,
The surface shape of the subject 1 may be evaluated.

When a film evaluation test was performed on various samples by the above method, the graph showed a straight line having a gentle gradient in the film portion, but a steep straight line in the base material portion. It is considered that this is because the coating portion is hard and cannot be easily cut by the spray material.

In some cases, a vertical straight line exists at the connection between the gentle gradient and the steep gradient (FIGS. 3, 4, and 5). This is considered to be due to the film falling off at a stretch when the film becomes thinner due to abrasion by the spray material. Therefore, if the length of the vertical straight portion is short, it is considered that the layer thickness of such a portion which is dropped at a stretch is thin, and it is considered that the adhesion between the film and the base material is high. Further, if there is no vertical straight line portion (FIG. 6), it is considered that the adhesion between the coating and the base material is extremely strong or there is no clear interface.

Further, when the vertical straight portion exists on the film side, it is considered that the layer thickness exhibiting the characteristics as the film is smaller than the actual thickness of the film.

As described above, according to this example, it was confirmed that various characteristics of the film became clear.

It has also been confirmed that the results of this experiment are extremely excellent in reproducibility. If data is collected in advance, the characteristics of an unknown film can be easily evaluated and analyzed.
It will be possible to specify.

Such experimental results have also been confirmed for a multilayer film provided on a semiconductor material, and it is possible to evaluate the interface state and adhesion between the respective layers.

By changing the projection angle of the blasting material 4 on the surface of the subject 1 by the rotating mechanism 6 and performing the test, the characteristic characteristic (angle dependency) of each film of each subject 1 is also improved. It was confirmed that the judgment could be made easily and clearly.
That is, by collecting a large number of such sample data, it is possible to easily determine the mechanical properties and chemical properties of each film by comparing the test data, and even in the case of a film whose material is unknown, the material can be easily determined by this embodiment. And can be identified.

The operation and effect of this embodiment are as follows.

Since the abrasive grains and abrasion powder (falling powder) are satisfactorily removed from the surface of the test subject 1 by the liquid in the spray material 4, the spray material 4 sprayed from the spray mechanism 5 is always applied to the film or the base material. Collisions are satisfactorily performed, and the weight loss of the film and the base material proceeds stably and well.

Since the abrasive grains in the blast material 4 are handled together with the liquid, even abrasive grains having a small particle size, for example, abrasive grains of several tens to several μm or abrasive grains of 1 μm or less can be handled well. Even an extremely thin film having a thickness of about several tens to several μm can be removed little by little and an experiment can be performed with good reproducibility, and the characteristics of the film can be accurately derived and evaluated.

In this respect, in the blast erosion method,
Since only abrasive grains having a large particle size can be used, when an extremely thin film having a thickness of about several μm is tested, the film falls off at a stretch, and the experiment cannot be performed with good reproducibility. Also,
When using large abrasive grains and slowing down the injection speed,
Since the film often has high abrasion by nature, the film cannot be abraded. In the present embodiment, since abrasive grains having a small particle diameter are used and the injection speed can be kept high, even a thin film can be cut little by little.

In the blast erosion method, a method of measuring the weight loss volume from the weight loss is adopted.
In the case of a thin film, the weight to be reduced is very small, and it is difficult to measure accurately. In the present embodiment, since a method of measuring the wear depth is employed, even a small amount of wear can be measured, and accurate measurement can be performed.

It is also conceivable to apply a scratch test method or a sliding wear test method. The former method can measure the adhesive strength at the interface of the film, but the other characteristics (abrasion resistance of the actual film) ) Cannot be measured accurately, and the latter does not progress with small loads, and must inevitably wear by applying a large load or increasing the sliding speed, In this case, since the load acting on the film is large, the film falls off in a short time, and it is extremely difficult to evaluate various characteristics of the film. In the present embodiment, even a thin film can be cut little by little, so that the characteristics (abrasive wear strength, cutting strength, etc.) of the film can be evaluated in a short time and with good reproducibility.

The heat generated when the surface of the subject 1 is worn by the liquid in the propellant 4 is removed well, so that the coating and the subject 1 are shaved at a certain temperature and reduced in weight.

Further, since a liquid film is formed on the abrasive grains in the blast material 4, the surface area of the abrasive grains increases, and the injection pressure is hardly lost.

Since the liquid and abrasive grains in the propellant 4 are formed into particles by the expansion of the compressed air and collide with the coating or the test object 1, when compared with the conventional blast erosion method,
High wear force can be exhibited with low injection force.

According to the above-described operation, the present embodiment can satisfactorily reduce the weight of an extremely thin film, and can perform a film evaluation test in a short time with a small measurement error and good reproducibility. .

Since the present embodiment is constructed as described above, it is possible to easily evaluate the film characteristics even with an extremely thin film by an extremely simple operation procedure, and has a small measurement error and excellent reproducibility. It is a coating evaluation tester with excellent practicality.

The sprayed material 4 collides with the surface of the subject 1 and falls immediately after the collision, so that the abrasive particles and abrasion powder of fine particles are not scattered in the air for a long time. It is not necessary to improve the airtightness of the spray chamber for spraying, and it is not necessary to install a device such as a dust collection filter or cyclone that collects abrasive particles, and it is easy to miniaturize the device. Becomes

Further, water droplets containing abrasive grains accumulate in a collecting mechanism 7 provided below the subject 1 fixed to the fixing mechanism 3. Since the jetting mechanism 5 is configured so that the jetting mechanism 5 can inject the jetting material again, the jetting material container and the collection container are not required, the apparatus can be downsized, and the jetting material 4 can be reused as it is. The film evaluation tester excels in practicality.

Since the recovery mechanism 7 is provided with the stirring mechanism 9, the abrasive grains in the blasting material 4 are uniformly dispersed, and the blasting material 4 is always sent to the blasting mechanism 5 at a constant abrasive grain concentration. As a result, there is no error due to unevenness in the abrasive grain concentration, and the coating evaluation tester is more practical because it hardly clogs the nozzles of the injection mechanism 5 and the feed mechanism 8.

Further, since the rotating mechanism 6 is provided in the fixing mechanism 3, the characteristics of the film can be further improved by performing tests by changing the angle of the surface of the test object 1 with respect to the jetting material 4 to be jetted in various ways. It is a coating evaluation tester that is more practical and can be grasped more accurately.

Further, since the moving distance of the blast material 4 sprayed onto the subject 1 is not changed even when the subject 1 is rotated by the rotating mechanism 6, the measurement is performed at various angles. This makes it possible to easily compare the evaluations of the coatings even when the coating is performed.

[0068]

According to the present invention, even abrasive grains having a small diameter can be used. Therefore, even a very thin film, which has been difficult to evaluate in the past, has extremely good reproducibility, high accuracy, and short length. It is a film evaluation tester with excellent practicality that can evaluate its characteristics in time.

Further , since the diameter of the abrasive grains in the sprayed material is very small, even if the coating has a thickness of about several tens to several μm, it can be satisfactorily abraded little by little and its characteristics can be evaluated .

The weight loss of the subject and the time required for the weight loss
By plotting the relationship between
And the state of the interface with the
Evaluate the adhesion and interface state to ensure the properties of the film
Innovative film evaluation with excellent practicality that can be evaluated
Test method.

Also, a multilayer film formed on a semiconductor or the like.
Practicality that can easily evaluate its characteristics
This is a revolutionary film evaluation test method with excellent properties.

According to the third aspect of the present invention, it is possible to easily evaluate the characteristics when the subject is turned by the turning mechanism to make the film an inclined surface .

Further, the jetting material can be repeatedly used by the collecting mechanism, and the jetting material is always kept in a constant state by the stirring mechanism, so that the characteristics of the film can be evaluated with good reproducibility .

Further, the characteristic evaluation when the injection pressure is changed by the pressure adjusting mechanism can be easily performed .

[Brief description of the drawings]

FIG. 1 is an explanatory side sectional view of this embodiment.

FIG. 2 is an explanatory plan sectional view of the present embodiment.

FIG. 3 is a graph showing an example of an experimental example.

FIG. 4 is a graph showing an example of an experimental example.

FIG. 5 is a graph showing an example of an experimental example.

FIG. 6 is a graph showing an example of an experimental example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Subject 2 Film evaluation test machine 3 Fixing mechanism 4 Injection material 5 Injection mechanism 6 Rotating mechanism 7 Recovery mechanism 8 Sending mechanism 9 Stirring mechanism 16 Pressure adjustment mechanism

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-366747 (JP, A) JP-A-8-62113 (JP, A) JP-A-58-211628 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) G01N 3/56 JICST file (JOIS)

Claims (3)

(57) [Claims] 1. A method for evaluating characteristics of a film formed on a surface of a subject such as a metal material or a synthetic resin material ,
A coating having a fixing mechanism for fixing a subject, and a jetting mechanism for reducing the quantity of the subject by jetting an blasting material in which abrasive grains are mixed with a liquid to the subject fixed to the fixing mechanism together with compressed air.
Adopted an evaluation tester , the maximum particle size of the abrasive was 25μ
m or less, and pressurized air from the injection mechanism
To reduce the weight of the subject,
The causal relationship with the time required for
Adhesion and adhesion strength at the interface between the formed film and the base material
Film evaluation test characterized by evaluating boundary characteristics such as
Method. 2. A method for evaluating characteristics of a film formed on a surface of a subject, such as a metal material or a synthetic resin material ,
A coating having a fixing mechanism for fixing a subject, and a jetting mechanism for reducing the quantity of the subject by jetting an blasting material in which abrasive grains are mixed with a liquid to the subject fixed to the fixing mechanism together with compressed air.
Adopted an evaluation tester , the maximum particle size of the abrasive was 25μ
m or less, and pressurized air from the injection mechanism
To reduce the weight of the subject,
The causal relationship with the time required for
The interface between the layers of the formed multilayer film or the film and the mother
Evaluate the boundary characteristics such as adhesion and bonding strength at the interface of the material.
And a coating evaluation test method. 3. The film according to claim 1, wherein
In the evaluation test method, the blasting material is obtained by mixing abrasive grains composed of resin grains, metal grains, ceramic grains or glass grains into a solution such as an aqueous solution such as water or alkali or a solvent such as alcohol. A rotating mechanism is provided that can rotate the subject fixed to the fixing mechanism to adjust the contact angle between the spray material and the subject, and the subject fixed to the fixing mechanism on the rotating axis of the rotating mechanism. Even if the body is set and the subject is rotated, the ejection movement distance of the injection material ejected to the subject is not changed even if the subject is rotated, and the body is positioned below the subject fixed to the fixing mechanism. The is provided with a collection mechanism for collecting the injection material injected from the injection mechanism to the subject,
The recovery mechanism is provided with a stirring mechanism that mixes the liquid of the propellant and the abrasive particles in the recovery mechanism at a substantially constant ratio and is uniform, and the recovery mechanism and the injection mechanism feed the propellant. It is connected by the flow sending mechanism that flows and is set so that the injection material injected to the subject is again injected from the injection mechanism to the subject together with the compressed air via the collection mechanism and the flow sending mechanism, The coating evaluation test , characterized in that a pressure adjustment mechanism for adjusting the injection pressure between the material and compressed air is provided.
Test method .