JP7049869B2 - Silicon impregnated ceramic composite manufacturing method, friction plate manufacturing method, and brake disc manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a silicon-impregnated ceramic composite material, a method for manufacturing a friction plate, and a method for manufacturing a brake disc.

As a silicon-impregnated ceramic composite material, for example, an impermeable heat-resistant structural composite material disclosed in Patent Document 1 is known. The impermeable heat-resistant structural composite material of Patent Document 1 is composed of a porous base material having a matrix made of carbon and silicon carbide and fire-resistant fibers, and silicon impregnated in the porous base material. Such a silicon-impregnated ceramic composite has mechanical properties suitable for constituting structural elements, and can retain the mechanical properties even at high temperatures.

Japanese Unexamined Patent Publication No. 2005-320236

By the way, the silicon-impregnated ceramic composite material disclosed in Patent Document 1 is manufactured as follows. First, a matrix is formed on a fiber reinforced material made by combining refractory fibers to obtain a porous base material (ceramic composite material). The matrix is heated by a gas process in which pyrolytic carbon and silicon carbide are deposited on the fibers of the fiber reinforcing material by chemical steam infiltration, or by heating the fiber reinforcing material in a state of being impregnated with a liquid composition containing a precursor. It is formed by a liquid process that converts the precursor into carbon or silicon carbide. Next, the porous base material is impregnated with molten metallic silicon by utilizing the capillary phenomenon.

In such a manufacturing method disclosed in Patent Document 1, it is necessary to form a ceramic composite material in advance before impregnating with metallic silicon. Therefore, two heat treatments are required, one for forming the ceramic composite material (forming the matrix) and the other for impregnating the metallic silicon, which complicates the manufacturing work.

The present invention has been made in view of these circumstances, and an object of the present invention is to simplify the manufacturing process of a silicon-impregnated ceramic composite material such as a friction plate and a brake disc.

The method for producing a silicon-impregnated ceramic composite material for achieving the above object is to heat a molded body containing a ceramic fiber and a ceramic precursor to ceramicize the ceramic precursor to obtain a ceramic composite material. A method for producing a silicon-impregnated ceramic composite material, which comprises a step and an impregnation step of impregnating the ceramic composite material with metallic silicon, wherein the molded body is formed inside a container for accommodating solid metallic silicon via a support. After performing the firing step with the temperature in the container set to the temperature at which the ceramic precursor is ceramicized and the first temperature lower than the melting point of the metallic silicon, the temperature in the container is set to the second temperature equal to or higher than the melting point of the metallic silicon. By raising the temperature, the impregnation step of impregnating the ceramic composite material with the molten metallic silicon through the support made of a porous material is performed.

According to the above configuration, by setting the temperature inside the container to the first temperature at which the ceramic precursor is ceramicized, the ceramic precursor contained in the molded body is ceramicized to obtain a ceramic composite material having voids. Since the first temperature at this time is a temperature lower than the melting point of the metallic silicon, the metallic silicon contained in the container is maintained in a solid state. Then, by raising the temperature inside the container to a second temperature equal to or higher than the melting point of the metallic silicon, the metallic silicon is melted. The molten metallic silicon impregnates the voids of the ceramic composite through the support to obtain a silicon-impregnated ceramic composite. As described above, by controlling the temperature inside the container, the firing step and the impregnation step can be continuously performed in one heat treatment, and as a result, the manufacturing step of the silicon-impregnated ceramic composite material is simplified.

In the method for producing a silicon-impregnated ceramic composite material of the present invention, the first temperature is preferably 500 ° C. or higher and 1400 ° C. or lower, and the second temperature is preferably 1410 ° C. or higher and 2000 ° C. or lower.

According to the first temperature of the above configuration, the ceramic precursor is more preferably ceramic while suppressing the metal silicon from melting and impregnating the molded product during the heat treatment at the first temperature corresponding to the firing step. It is possible to form a void at the same time. Further, according to the second temperature having the above configuration, the impregnation of the metallic silicon into the voids of the ceramic composite material can be suitably promoted at the time of the heat treatment at the second temperature corresponding to the impregnation step, and the ceramic composite material is excessively heated. Deterioration due to being done can be suppressed.

In the method for producing a silicon-impregnated ceramic composite material of the present invention, the ceramic fiber is preferably at least one selected from carbon fiber and silicon carbide fiber.
According to the above configuration, the metallic silicon is easily impregnated into the ceramic composite material in the impregnation step due to the properties of carbon and silicon carbide having high affinity for metallic silicon. As a result, a dense silicon-impregnated ceramic composite material with few voids can be obtained.

In the method for producing a silicon-impregnated ceramic composite material of the present invention, the ceramic precursor is at least one selected from a carbon-based precursor that becomes carbon by heating and a silicon carbide-based precursor that becomes silicon carbide by heating. preferable.

According to the above configuration, in the firing step, a ceramic composite material having a matrix (porous matrix) composed of at least one of carbon and silicon carbide can be obtained while forming voids. Therefore, based on the properties of carbon and silicon carbide having high affinity for metallic silicon, metallic silicon is likely to be impregnated into the voids of the ceramic composite material in the impregnation step. As a result, a dense silicon-impregnated ceramic composite material with few voids can be obtained.

In the method for producing a silicon-impregnated ceramic composite material of the present invention, the temperature inside the container is changed from the first temperature to the second temperature based on the change in the decomposition gas derived from the ceramic precursor contained in the molded product. It is preferable to raise the temperature.

According to the above configuration, it is possible to prevent the heating time due to the first temperature from becoming insufficient or excessive. That is, when the molded product is heated at the first temperature, the ceramic precursor contained in the molded product becomes ceramic. Along with this ceramicization, decomposition gas derived from the ceramic precursor is generated. Therefore, by raising the temperature from the first temperature to the second temperature based on the generation state of the decomposition gas derived from the ceramic precursor, the heating time at the first temperature can be set to an arbitrary state in which the ceramicization of the ceramic precursor progresses. For example, it can be easily adjusted to the time when it becomes completely ceramicized).

The method for manufacturing a friction plate for achieving the above object includes the above method for manufacturing a silicon-impregnated ceramic composite material.
According to the above configuration, the manufacturing process of the friction plate can be simplified.

The method for manufacturing a brake disc for achieving the above object includes the above method for manufacturing a silicon-impregnated ceramic composite material.
According to the above configuration, the manufacturing process of the brake disc can be simplified.

According to the present invention, the manufacturing process of the silicon-impregnated ceramic composite material can be simplified.

(A) is a schematic diagram of a fiber structure, (b) is a schematic diagram of a molded body, (c) is a schematic diagram of a ceramic composite material, and (d) is a schematic diagram of a silicon-impregnated ceramic composite material. Explanatory drawing which shows the state which the molded body is arranged in a container. A graph showing the temperature change in the container. A graph showing the temperature change of the modified example.

Hereinafter, an embodiment of a method for manufacturing a silicon-impregnated ceramic composite material will be described.
The silicon-impregnated ceramic composite material is manufactured by going through the molding step, the firing step, and the impregnation step described below in this order.

(Molding process)
The molding step is a step of molding a molded body containing a ceramic fiber and a ceramic precursor.

As shown in FIG. 1A, the fiber structure 12 constituting the aggregate portion of the molded body is formed by combining a plurality of ceramic fibers 11. The method for forming the fiber structure 12 is not particularly limited, and a known method used for producing a silicon-impregnated ceramic composite material can be used. Examples of the known method include a method of stacking sheet-shaped two-dimensional fiber layers such as woven fabric and non-woven fabric, and a method of using three-dimensional weaving. FIG. 1A illustrates a fiber structure 12 in which a plurality of ceramic fibers 11 are stacked.

Examples of the ceramic fiber 11 include carbon fiber, silicon carbide fiber, alumina fiber, and mullite fiber. Among these, carbon fibers and silicon carbide fibers are particularly preferable from the viewpoint of improving the impregnation efficiency of metallic silicon in the impregnation step described later. The fiber structure 12 may be made of one kind of ceramic fiber 11 or may be made of a plurality of kinds of ceramic fiber 11. The diameter of the ceramic fiber 11 is, for example, 5 to 30 μm.

Next, as shown in FIG. 1 (b), the gaps between the fibers of the fiber structure 12 and the surface of the fiber structure 12 are filled with a filler containing a ceramic precursor as a main component for molding. Form the body 13a. The molded body 13a has a skeleton portion 14 made of a fiber structure 12 and a matrix portion 15a made of a ceramic precursor (filler).

The ceramic precursor is a precursor used in the polymer impregnation firing method (PIP method). Examples of the ceramic precursor include a carbon-based precursor that becomes carbon by heating, a silicon carbide-based precursor that becomes silicon carbide by heating, and a metal alkoxide-based precursor that becomes an oxide-based ceramic by heating. Examples of the carbon-based precursor include pitch, phenol resin, furan resin, polyvinyl alcohol, copna resin and the like. Examples of the silicon carbide-based precursor include polycarbosilane and its derivatives, and a mixture of a siloxane-based resin and a carbon-based precursor. Examples of the metal alkoxide-based precursor include sodium methoxide, sodium ethoxide, potassium t-butoxide and the like. Among these, from the viewpoint of improving the impregnation efficiency of metallic silicon in the impregnation step described later, a carbon-based precursor, a silicon carbide-based precursor, and a combination of a carbon-based precursor and a silicon carbide-based precursor are particularly preferable. The filler may be composed of one kind of ceramic precursor or may be composed of a plurality of kinds of ceramic precursors.

If the ceramic precursor contained in the molded body 13a is thermosetting, it is preferable to cure it in advance before the firing step. By curing in advance, it is possible to prevent deformation due to softening in the firing process. The curing method is not particularly limited, and a method using a reaction catalyst, a method of heat curing, and the like can be used. The term "thermosetting" means a resin in which the monomers are bonded in a network shape and does not flow even when heated, and is said to be thermosetting even if it can be cured by a method other than heating.

Further, the filler may contain other components other than the ceramic precursor such as a solvent and a ceramic powder.
(Baking process)
The firing step is a step of obtaining a ceramic composite material 13b by ceramicizing the ceramic precursor contained in the molded body 13a by heating. As shown in FIG. 1 (c), the ceramic composite 13b has a skeleton portion 14 made of a fiber structure 12 and a matrix portion 15b made of a ceramic derived from a ceramic precursor. The matrix portion 15b has voids formed by the ceramicization of the ceramic precursor, and the ceramic composite 13b is a porous body having the voids.

(Immersion process)
The impregnation step is a step of obtaining a silicon-impregnated ceramic composite material 13c by impregnating the voids of the ceramic composite material 13b with metallic silicon melted by heating. As shown in FIG. 1 (d), the silicon-impregnated ceramic composite 13c has a skeleton portion 14 composed of a fiber structure 12 and a matrix portion 15c composed of ceramic derived from a ceramic precursor and metallic silicon. It is a dense body.

In the production method of the present embodiment, the firing step and the impregnation step are continuously performed by a multi-step heat treatment in different temperature ranges.
As shown in FIG. 2, the molded body 13a is arranged in a bottomed box-shaped heat-resistant container 20 made of ceramic or the like. The molded body 13a is placed in the container 20 via the support 21 by being placed on the support 21 arranged on the bottom surface of the container 20. The support 21 is formed in a size and shape that contacts only a part of the lower surface of the molded body 13a, and supports the molded body 13a at one or several points on the lower surface of the molded body 13a. The number of supports 21 may be singular or plural.

Examples of the shape of the support 21 include a prismatic shape, a cylindrical shape, a pyramidal cone shape, and a truncated cone shape. Among these, a pyramidal cone shape or a truncated cone shape is particularly preferable from the viewpoint that the number of contacts with the lower surface of the molded body 13a can be reduced.

The support 21 is made of a porous material having continuous pores having a size sufficient to cause a capillary phenomenon. Examples of the porous material constituting the support 21 include a porous material made of silicon carbide and a porous material made of carbon such as graphite. The porosity of the porous material constituting the support 21 is, for example, 20 to 60%.

Further, solid metallic silicon 22 such as powder, granules, and lumps is arranged in the gap S between the bottom surface of the container 20 and the molded body 13a placed on the support 21. The purity of metallic silicon is, for example, 95% or more.

The amount of the metallic silicon 22 contained in the container 20 is, for example, an amount corresponding to the sum of the pore volumes of the ceramic composite material 13b and the pore volumes of the support 21 (for example, 1.00 to 1.05 times the sum of the above sums). The amount corresponding to the volume of). In this case, the porosity of the silicon-impregnated ceramic composite material 13c can be brought close to 0%. In addition, the amount of metallic silicon 22 used can be suppressed, and the manufacturing cost can be suppressed.

As described above, with the molded body 13a and the metallic silicon 22 arranged in the container 20, the container 20 is placed in an inert atmosphere such as argon or nitrogen or under vacuum using a known heating means such as a firing furnace. To heat. At this time, the container 20 is heated in multiple stages in different temperature ranges.

Specifically, as shown in FIG. 3, the temperature inside the container 20 is raised to the first temperature and held at the first temperature for a certain period of time to perform primary heating. After that, the temperature inside the container 20 is raised to a second temperature higher than the first temperature and held for a certain period of time to perform secondary heating. After that, the temperature inside the container 20 is lowered.

The primary heating is a heat treatment corresponding to the firing step. The first temperature of the primary heating is a temperature at which the ceramic precursor is ceramicized and a temperature lower than the melting point of the metallic silicon, and is set according to the type of the ceramic precursor contained in the molded body 13a. By the primary heating, the ceramic precursor contained in the molded body 13a is thermally decomposed and converted into ceramic, and voids are formed, so that the molded body 13a becomes the ceramic composite material 13b. At this time, since the temperature inside the container 20 (first temperature) is lower than the melting point of the metallic silicon, the metallic silicon 22 housed in the container 20 is maintained in a solid state.

The first temperature is, for example, preferably 500 ° C. or higher and 1400 ° C. or lower, and more preferably 1200 ° C. or higher and 1350 ° C. or lower. By setting the temperature in the above temperature range, it is possible to more preferably suppress the melting of the metallic silicon 22 while ceramicizing the ceramic precursor to form voids at the same time.

The primary heating is preferably performed until the ceramic precursor contained in the molded product 13a is sufficiently ceramicized. Whether or not the ceramic precursor is sufficiently ceramicized can be determined, for example, based on the change in the decomposition gas generated from the molded body 13a. That is, when the ceramic precursor is ceramicized by heating, decomposition gas is generated due to the thermal decomposition of the ceramic precursor. Therefore, by measuring this decomposition gas, the total amount of decomposition gas generated, the amount of change in the amount of decomposition gas generated per unit time, the concentration and type of decomposition gas in the furnace, and the concentration of decomposition gas per unit time Based on the amount of change and the like, it can be determined that the ceramic precursor contained in the molded body 13a is sufficiently (for example, 90% or more) ceramicized.

The secondary heating is a heat treatment corresponding to the impregnation step. The second temperature of the secondary heating is set to be equal to or higher than the melting point of metallic silicon. The secondary heating melts the metallic silicon 22 contained in the container 20. Then, the molten metallic silicon enters the voids of the ceramic composite material 13b through the support 21 made of a porous material due to the capillary phenomenon, and the voids are impregnated with the metallic silicon 22. As a result, the ceramic composite material 13b becomes a silicon-impregnated ceramic composite material 13c impregnated with the metallic silicon 22.

The second temperature is preferably, for example, a temperature of 1410 ° C. or higher and 2000 ° C. or lower. By setting the temperature in the above temperature range, it is possible to more reliably impregnate the metallic silicon while suppressing the deterioration of the skeleton portion 14 and the matrix portion 15b of the ceramic composite material 13b due to exposure to a high temperature.

The secondary heating is preferably performed until the voids existing inside the ceramic composite material 13b are sufficiently impregnated with metallic silicon. For example, when the amount of metallic silicon 22 contained in the container 20 is an amount corresponding to the sum of the pore volume of the ceramic composite material 13b and the pore volume of the support 21, all the metallic silicon 22 is impregnated. Therefore, it can be determined that the metallic silicon is sufficiently impregnated.

Then, after the secondary heating, the temperature inside the container 20 is lowered, the silicon-impregnated ceramic composite material 13c is taken out from the container 20, and the support 21 integrated with the lower surface of the silicon-impregnated ceramic composite material 13c is separated. As a result, the silicon-impregnated ceramic composite material 13c is obtained.

The application of the silicon-impregnated ceramic composite material 13c manufactured by the manufacturing method of the present embodiment is not particularly limited, but it can be applied as a friction plate such as a brake disc or a clutch disc, for example. Therefore, the manufacturing method of the present embodiment can also be applied as one step in the case of manufacturing a friction plate such as a brake disc or a clutch disc.

Next, the effect of this embodiment will be described.
(1) The method for producing a silicon-impregnated ceramic composite material includes a firing step of heating a molded body containing a ceramic fiber and a ceramic precursor to ceramicize the ceramic precursor to obtain a ceramic composite material, and a ceramic composite. It has an impregnation step of impregnating the material with metallic silicon. The molded product is placed inside a container containing solid metallic silicon via a support. After performing the firing step with the temperature inside the container set to the temperature at which the ceramic precursor is ceramicized and below the melting point of metallic silicon, the temperature is raised to a second temperature above the melting point of metallic silicon to melt the mixture. An impregnation step of impregnating the ceramic composite material with metallic silicon through a support made of a porous material is performed.

According to the above configuration, by controlling the temperature inside the container, the firing step and the impregnation step can be continuously performed in one heat treatment, and as a result, the manufacturing step of the silicon-impregnated ceramic composite material is simplified. ..

(2) The first temperature is a temperature of 500 ° C. or higher and 1400 ° C. or lower.
According to the above configuration, in the primary heating corresponding to the firing step, it is possible to more preferably suppress the metal silicon from melting and impregnating the molded product, and at the same time, the ceramic precursor is ceramicized to form voids. can.

(3) The second temperature is a temperature of 1410 ° C. or higher and 2000 ° C. or lower.
According to the above configuration, in the secondary heating corresponding to the impregnation step, the impregnation of metallic silicon into the voids of the ceramic composite material can be suitably promoted, and deterioration due to excessive heating can be suppressed.

(4) The ceramic fiber is at least one selected from carbon fiber and silicon carbide fiber.
According to the above configuration, the ceramic composite material is easily impregnated with metallic silicon in the impregnation step due to the properties of carbon and silicon carbide having high affinity for metallic silicon. As a result, a dense silicon-impregnated ceramic composite material with few voids can be obtained.

(5) The ceramic precursor is at least one selected from a carbon-based precursor that becomes carbon by heating and a silicon carbide-based precursor that becomes silicon carbide by heating.
According to the above configuration, in the firing step, a ceramic composite material having a matrix (porous matrix) composed of at least one of carbon and silicon carbide can be obtained while forming voids. Therefore, based on the properties of carbon and silicon carbide having high affinity for metallic silicon, metallic silicon is likely to be impregnated into the voids of the ceramic composite material in the impregnation step. As a result, a dense silicon-impregnated ceramic composite material with few voids can be obtained.

(6) The temperature inside the container is raised from the first temperature to the second temperature based on the change in the decomposition gas derived from the ceramic precursor contained in the molded product.
According to the above configuration, by raising the temperature from the first temperature to the second temperature based on the generation state of the decomposition gas derived from the ceramic precursor, the heating time at the first temperature is set, and the progress of the ceramicization of the ceramic precursor progresses. It can be easily adjusted to an arbitrary state (for example, a completely ceramicized state). Therefore, it is possible to prevent the heating time due to the first temperature from becoming insufficient or excessive.

(7) Based on the amount of change in the amount of decomposition gas generated per unit time, the amount of change in the concentration of decomposition gas in the firing furnace per unit time, or the type of decomposition gas. The temperature inside the container is raised from the first temperature to the second temperature.

According to the above configuration, the heating time at the first temperature can be easily adjusted to the time during which the ceramic precursor is sufficiently ceramicized. Therefore, the impregnation step is performed by raising the temperature to the second temperature in a state where the ceramic precursor is not sufficiently ceramicized, and heating at the first temperature continues even after the ceramic precursor is sufficiently ceramicized. It can be suppressed.

The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

In the above embodiment, the molded body 13a is formed by filling the fiber structure 12 formed by combining the ceramic fibers 11 with a filler containing a ceramic precursor. However, a method for forming the molded body 13a. Is not limited to this. For example, the fiber structure 12 may be filled with a filler and then subjected to processing such as cutting to obtain a molded body 13a. Further, the molded body 13a may be formed by molding the mixed material containing the ceramic precursor and the ceramic fiber 11 into a predetermined shape.

-In the above embodiment, the support 21 made of a porous material is used, but the support 21 has a porous shape that causes a capillary phenomenon when the secondary heating (impregnation step) is performed. good. For example, the support tool 21 made of a filler used for forming the molded body 13a or the support tool 21 made of a cut piece generated when the molded body 13a is obtained may be used. In this case, by undergoing the primary heating (firing step), the support 21 is also ceramicized in the same manner as the molded body 13a, and voids are formed to form the support 21 having a porous structure. Further, in the molding step, the support 21 portion may be integrally formed with the molded body 13a, and the molded body 13a having the support 21 portion may be directly placed on the container 20.

-The method of setting the timing for raising the temperature in the container 20 from the first temperature to the second temperature may be changed. For example, by a preliminary test in advance, the heating time at which the progress of ceramicization of the ceramic precursor contained in the molded body 13a is in an arbitrary state is measured, and the temperature inside the container 20 is measured with the passage of the heating time. The temperature may be raised from the first temperature to the second temperature.

-The primary heating corresponding to the firing step may change the temperature within the range of the first temperature. For example, as shown in FIG. 4, the temperature inside the container 20 may be continuously raised to the second temperature, and the period of staying in the first temperature range (first temperature range) in the middle of the temperature may be set as the primary heating. In this case, it is preferable to adjust the temperature rise curve in the container 20 so that the period of staying in the first temperature range is sufficiently secured. Similarly, the temperature of the secondary heating corresponding to the impregnation step may be changed within the range of the second temperature.

Hereinafter, examples in which the above embodiment is further embodied will be described.
As shown in FIGS. 1 (a) and 1 (b), a disk-shaped molded body having a diameter of 300 mm and a thickness of 10 mm is formed by filling the gaps and surfaces of the fiber structure in which ceramic fibers are stacked with a filler. do. As the ceramic fiber, a plain weave woven fabric using a silicon carbide fiber having a diameter of 12 μm is used, and five of these woven fabrics are laminated and used as an aggregate. The obtained aggregate is impregnated with a liquid phenol resin as a filler, and then placed in a dryer to be cured. In the dryer, the phenol resin can be thermally cured, and a molded product that does not undergo thermal deformation in the subsequent firing step can be obtained.

Next, as shown in FIG. 2, a molded body is placed in a ceramic container via a support made of a porous material of silicon carbide, and powdered metallic silicon is placed. Then, using a firing furnace, the molded body and the container containing the metallic silicon are subjected to a two-step heat treatment at the first temperature and the second temperature under an argon atmosphere, as shown in FIG. Thereby, a silicon-impregnated ceramic composite material can be obtained. The temperature conditions for the heat treatment are as follows.

First temperature: 1300 ° C
Heating time by first temperature: 60 minutes Second temperature: 1500 ° C
Heating time at the second temperature: 20 minutes In addition, the amount of decomposition gas generated in the firing furnace during the heat treatment is measured. The decomposition gas continues to be generated from the phenol resin (ceramic precursor) until the temperature rises to the first temperature and the temperature is maintained at the first temperature, but the generation of the decomposition gas converges with the passage of time. After confirming that the generation of the decomposition gas has converged, the temperature is raised to the second temperature. At the second temperature, the metallic silicon filled in the ceramic container is melted, and a support made of a porous material is transmitted to impregnate the ceramic composite material, so that firing and silicon impregnation can be continuously performed. ..

In the method for producing a silicon-impregnated ceramic composite material of this embodiment, the ceramic precursor is thermally cured in the firing step, and deformation during firing can be prevented.

S ... Gap, 11 ... Ceramic fiber, 12 ... Fiber structure, 13a ... Molded body, 13b ... Ceramic composite material, 13c ... Silicon-impregnated ceramic composite material, 14 ... Skeletal part, 15a, 15b, 15c ... Matrix part, 20 ... Container, 21 ... Support, 22 ... Metallic silicon.

Claims (8)

A firing step of heating a molded body containing a ceramic fiber and a ceramic precursor to obtain a ceramic composite material by ceramicizing the ceramic precursor.
A method for producing a silicon-impregnated ceramic composite material, which comprises an impregnation step of impregnating the ceramic composite material with metallic silicon.
The molded product is placed inside a container containing solid metallic silicon via a support.
After performing the firing step with the temperature inside the container set to the temperature at which the ceramic precursor is ceramicized and the first temperature lower than the melting point of the metallic silicon, the temperature is raised to a second temperature equal to or higher than the melting point of the metallic silicon. A method for producing a silicon-impregnated ceramic composite material, which comprises performing the impregnation step of impregnating the ceramic composite material with the molten metallic silicon through the support tool made of a porous material. The ceramic precursor is thermosetting and is thermosetting.
The method for producing a silicon-impregnated ceramic composite material according to claim 1, wherein the molded product is pre-cured before the firing step. The first temperature is a temperature of 500 ° C. or higher and 1400 ° C. or lower.
The method for producing a silicon-impregnated ceramic composite material according to claim 1 or 2 , wherein the second temperature is a temperature of 1410 ° C. or higher and 2000 ° C. or lower. The method for producing a silicon-impregnated ceramic composite material according to any one of claims 1 to 3, wherein the ceramic fiber is at least one selected from carbon fiber and silicon carbide fiber. One of claims 1 to 4 , wherein the ceramic precursor is at least one selected from a carbon-based precursor that becomes carbon by heating and a silicon carbide-based precursor that becomes silicon carbide by heating. The method for producing a silicon-impregnated ceramic composite material according to. Claims 1 to 5 are characterized in that the temperature inside the container is raised from the first temperature to the second temperature based on the change in the decomposition gas derived from the ceramic precursor contained in the molded product. The method for producing a silicon-impregnated ceramic composite material according to any one of the above. A method for manufacturing a friction plate made of a silicon-impregnated ceramic composite material.
A method for manufacturing a friction plate, which comprises the method for manufacturing a silicon-impregnated ceramic composite material according to any one of claims 1 to 6 . A method for manufacturing brake discs made of silicon-impregnated ceramic composite material.
A method for manufacturing a brake disc, which comprises the method for manufacturing a silicon-impregnated ceramic composite material according to any one of claims 1 to 6 .

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