JP2022021196A - Ceramic-based composite material member, ceramic-based composite material member coated body, method for manufacturing ceramic-based composite material member, and method for manufacturing ceramic-based composite material member coated body - Google Patents

Abstract

To provide a ceramic-based composite material member which has corrosion resistance and heat resistance, a ceramic-based composite material member coated body, a method for manufacturing the ceramic-based composite material member, and a method for manufacturing the ceramic-based composite material member coated body.SOLUTION: A protective coating 1 is composed of a ceramic matrix composite (CMC) comprising an alumina fiber sheet 3 which is a ceramic fiber sheet formed in a woven fabric shape, and an alumina sol 4 which is a ceramic matrix containing alumina as a main material and having low viscosity and thixotropy. The protective coating covers an outer surface of a base material 2 made of SUS 430 to protect the base material 2 from molten aluminum.SELECTED DRAWING: Figure 1

Description

The present invention relates to a ceramic-based composite material member, a ceramic-based composite material member covering, a method for manufacturing a ceramic-based composite material member, and a method for manufacturing a ceramic-based composite material member covering.

In general, it is known that aluminum melted for casting (hereinafter, also referred to as molten aluminum) such as die casting has extremely high reactivity with other metals. Therefore, in order to prevent the holding container that holds the molten aluminum from melting due to the reaction with the molten aluminum, a special coating such as a surface treatment that forms a protective film by thermal spraying, oxidation, nitriding, etc. is applied. Used on. However, in the conventional method, the life of the protective film is short, and frequent maintenance such as periodically replacing the part in contact with the molten aluminum or re-applying the coating is required. In addition, the holding container for the molten aluminum, which may be subject to physical impact due to the introduction of aluminum ingots, needs to have mechanical strength to withstand long-term use. That is, there has been a demand for a protective film against molten aluminum, which has corrosion resistance that can withstand corrosion due to reaction with molten aluminum, heat resistance, and mechanical strength.
As a material having high heat resistance and mechanical strength, a ceramic-based composite material (hereinafter, also referred to as CMC) in which a ceramic substrate such as alumina and a reinforcing material made of ceramic fibers are combined is known. Some CMCs can withstand temperatures above 2000 ° C. without deterioration and have high mechanical strength. For example, Patent Document 1 describes a mullite-alumina-based ceramic substrate that has high heat resistance and high mechanical strength and can be used for spacecraft, aircraft, and the like exposed to extremely harsh environments. Patent Document 1 discloses a technique in which ceramic fibers are impregnated with a mullite-alumina ceramic substrate, the impregnated fibers are arranged on a tool, and then cured and fired to form CMC.

Japanese Patent No. 512997

It is considered that a protective film having heat resistance and mechanical strength can be formed by applying the CMC described in Patent Document 1 as a protective film for a holding container or the like for holding the molten aluminum. On the other hand, as described above, the protective film against the molten aluminum is required to have corrosion resistance that can withstand the high reactivity of the molten aluminum. However, Patent Document 1 does not describe or suggest corrosion resistance, and it is unclear whether sufficient corrosion resistance to molten aluminum can be obtained.

Therefore, an object of the present invention is to provide a ceramic-based composite material member having corrosion resistance and heat resistance, a ceramic-based composite material member covering, a method for manufacturing a ceramic-based composite material member, and a method for manufacturing a ceramic-based composite material member covering. There is something in it.

In order to achieve the above object, the invention according to claim 1 comprises a ceramic-based composite material member, which comprises ceramic fibers and alumina formed from an alumina sol impregnated in the ceramic fibers. It is characterized by being non-tick.
The invention according to claim 2 is characterized in that, in the above configuration, the viscosity of the alumina sol is 100 mPa · s or less.
The invention according to claim 3 is characterized in that, in the above configuration, the alumina sol and the ceramic fiber do not contain a heat radiating agent.
The invention according to claim 4 is characterized in that, in the above configuration, the alumina sol is impregnated under a reduced pressure lower than the atmospheric pressure.
The invention according to claim 5 is characterized in that, in the above configuration, the alumina contains γ-alumina.
The invention according to claim 6 includes the ceramic-based composite material member according to any one of claims 1 to 5, and a base material partially or wholly covered with the ceramic-based composite material member, wherein the base material is a base material. It has an insertion portion, and a part or all of the edge of the ceramic-based composite material member is inserted into the insertion portion.
The invention according to claim 7 includes the ceramic-based composite material member according to any one of claims 1 to 5, and a base material partially or wholly covered with the ceramic-based composite material member, wherein the base material is a base material. The ceramic-based composite material member has an end portion, and is characterized in that the ceramic-based composite material member is covered beyond the end portion of the base material, and the excess portion is sealed by being crushed.
The invention according to claim 8 is a method for manufacturing a ceramic-based composite material member, which comprises an impregnation step of impregnating ceramic fibers with a non-tixo-free alumina sol.
The invention according to claim 9 is characterized in that, in the above configuration, the viscosity of the alumina sol is 100 mPa · s or less.
The invention according to claim 10 is characterized in that, in the above configuration, the alumina sol and the ceramic fiber do not contain a heat radiating agent.
The invention according to claim 11 is characterized in that, in the above configuration, in the impregnation step, alumina sol is impregnated under a reduced pressure lower than the atmospheric pressure.
The invention according to claim 12 is characterized in that, in the above configuration, a preheat treatment step for heating the ceramic fiber is provided before the impregnation step.
The invention according to claim 13 is characterized in that, in the above configuration, the impregnation step is followed by a heat treatment step of exposing the ceramic fiber impregnated with alumina sol to an atmosphere of 800 ° C. or lower.
The invention according to claim 14 is a method for manufacturing a ceramic-based composite material member covering, wherein a coating step of covering a part or all of a base material with a ceramic fiber and a ceramic fiber covering the base material are not included. It is characterized by having an impregnation step of impregnating with a thixotropic alumina sol.
The invention according to claim 15 is characterized in that, in the above configuration, a part or all of the edge of the ceramic-based composite material member is inserted into the insertion portion of the base material having the insertion portion in the coating step. ..
In the invention according to claim 16, in the above configuration, in the coating step, the base material having an end portion is coated with a ceramic-based composite material member beyond the end portion of the base material, and the portion beyond the end portion is crushed. It is characterized by sealing by.

A main effect of the present invention is to provide a ceramic-based composite material member having corrosion resistance and heat resistance, and a method for manufacturing the ceramic-based composite material member.
Further, another main effect of the present invention is to provide a ceramic-based composite material member covering and a method for manufacturing a ceramic-based composite material member covering having corrosion resistance and heat resistance.

It is explanatory drawing which shows the protective film of embodiment of this invention. It is a graph which shows the viscosity change of an alumina sol with the passage of time. It is a flowchart which shows the formation procedure of the protective film of this invention. It is explanatory drawing which shows the base material before covering with a protective film. It is explanatory drawing which shows the covering body formed by winding the alumina fiber sheet around the base material. It is explanatory drawing which shows the dimension of the base material used in an Example and a comparative example. It is a photograph which shows the state of the comparative example after the repeated immersion test in the molten aluminum. It is a photograph which shows the state of Example 1-4 after the repeated immersion test in the molten aluminum. (A) is an SEM image of a cross section of a base metal of a comparative example after a repeated immersion test in a molten aluminum, (b) is an SEM image of a cross section of a base metal of Example 1 after a repeated immersion test in a molten aluminum, and (c) is an aluminum. It is an SEM image of the cross section of the base material of Example 2 after the repeated immersion test in the molten metal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing a protective film of the present invention.
The protective coating 1 which is a ceramic-based composite material member is formed on the surface of the base material 2 as a base material formed of a SUS material such as SUS430, particularly on the portion in contact with the molten aluminum, and is an alumina fiber reinforced alumina which is a kind of CMC. It is a matrix. The protective film 1 is formed by using an alumina fiber sheet 3 which is a ceramic fiber formed in the form of a woven fabric and an alumina sol 4. Further, the alumina sol 4 is γ alumina in the state of CMC. The base material 2 includes a heater portion (not shown) and a case (manufactured by SUS) thereof, and is for heating the molten aluminum to keep it in a molten state.

As the alumina fiber sheet 3, one formed of higher purity alumina fiber is effective in consideration of the reactivity with the molten aluminum. In the present invention, for example, ceramic fibers containing high-purity alumina such as Nextel (registered trademark) 610 and Nextel (registered trademark) 720 are spun by plain weave, twill weave or satin weave.
As the alumina sol 4, a sol having a high solid content concentration and a low viscosity, which does not contain a heat radiating agent, is effective in consideration of good matrix formation and impregnation between fibers and fiber bundles of the alumina fiber sheet 3. .. The solid content concentration of the alumina sol 4 is preferably 20 wt% or more. The viscosity of the alumina sol 4 is preferably 100 mPa · s or less at the time of the impregnation step described later. Among them, in consideration of impregnation efficiency, a sol having no thixo property, which increases in viscosity with the passage of time, is particularly preferable. For example, as shown in FIG. 2, which is a graph showing the change in the viscosity of the alumina sol over time, it is not a sol having a thixo property like AS-200 (manufactured by Nissan Chemical Industries, Ltd.) whose viscosity increases with the passage of time. , A thixo-free alumina sol such as AS-520-A (manufactured by Nissan Chemical Industries, Ltd.), which does not change its viscosity with the passage of time, is suitable.

It should be noted that the protective coating 1 which is a ceramic-based composite material member contains alumina formed from an alumina sol 4 having a thixo-free property, and may be considered to be specified by such a manufacturing method. Even so, it is considered that such identification is permissible because of the so-called impossible / impractical circumstances.
That is, there are a wide variety of non-tixo-free alumina sol, and specific examples are listed in order to distinguish it from the alumina in the ceramic fiber of the ceramic-based composite material member formed from the thixo-free alumina sol. It is practically impractical to directly identify the alumina in the ceramic fibers of a ceramic-based composite member formed from a thixophilic alumina sol by its structure or properties.
Further, the detailed structure and arrangement peculiar to alumina in the ceramic fiber of the ceramic-based composite material member are not known at present, and it is possible to search for the structure and arrangement even if such a structure and arrangement exist. It is considered almost impossible or impractical because it requires a lot of equipment and time.
Therefore, even if the alumina formed from the alumina sol in the ceramic fiber of the ceramic-based composite material member is considered to be specified by the manufacturing method, such specification should be allowed.

Next, a procedure for forming the covering body C by covering the base material 2 with the protective coating 1 will be described.
FIG. 3 is a flowchart showing the procedure for forming the protective film. FIG. 4 is an explanatory view showing a base material before covering with a protective film. FIG. 5 is an explanatory view showing a covering body formed by winding an alumina fiber sheet around a base material.
As described above, as the base material 2, a stainless steel member such as SUS430 is used here. For the sake of explanation, FIGS. 4 and 5 show a solid round bar formed according to Examples and Comparative Examples described later, but the shape of the base metal is not limited.
First, the base material processing step S1 is carried out.
In the base material processing step S1, a slit 5 as an insertion portion is formed in the range where the protective film 1 on the base material 2 is formed, as shown in FIG.

Subsequently, as a coating step, the winding step S2 is carried out. In the winding step S2, the alumina fiber sheet 3 is wound around the outer surface of the base material 2.
Before winding, the alumina fiber sheet 3 is cut into a size capable of making one or two turns on the outer surface of the base material 2. Further, as a pretreatment for preventing the edge of the alumina fiber sheet 3 from unraveling, a styrene-based adhesive is applied to the alumina fiber sheet 3. The handling property is improved by applying the adhesive.
Next, one end edge of the alumina fiber sheet 3 is inserted into the slit 5. After that, the alumina fiber sheet 3 is wound so as to be in close contact with the outer surface of the base material 2. By inserting one end edge of the alumina fiber sheet 3 into the slit 5 and then performing the winding operation, the formation of voids between the base material 2 and the protective coating 1 can be suppressed.

After winding the alumina fiber sheet 3 around the base material 2, as shown in FIG. 5, the end portion of the alumina fiber sheet 3 on the tip side of the base material 2 is made of two alumina and has cylindrical pins 6 and 6. It is sealed by sandwiching it, crushing it, and fixing it with platinum wire 7. A total of four pins 6, 6, 6, 6 are used to sandwich two places to ensure a secure seal. Here, the pins 6 and 6 are fixed by tying them with a platinum wire 7, but the fixing method is not limited. The pin 6 is not limited to a cylindrical shape, and may be a cylindrical shape, a square cylinder shape, a square pillar shape, or the like.
Further, in order to prevent the alumina fiber sheet 3 wound around the base material 2 from peeling off from the base material 2, the alumina fiber sheet 3 is attached to the base material 2 by using an alumina fixing jig 8 and a platinum wire 7. Temporarily fix it on top.

Subsequently, the preheat treatment step S3 is carried out. In the preheat treatment step S3, the alumina fiber sheet 3 is heat-treated at 700 ° C. By performing the preheat treatment on the alumina fiber sheet 3, the sizing agent of the alumina fiber sheet 3 is removed, and when the alumina fiber sheet 3 is impregnated with the alumina sol 4, between the fibers of the alumina fiber sheet 3 and between the fiber bundles. The alumina sol 4 is easily impregnated.

Next, the impregnation step S4 is carried out. In the impregnation step S4, the alumina fiber sheet 3 wound around the base material 2 is impregnated with the alumina sol 4.
The base material 2 around which the alumina fiber sheet 3 is wound is immersed in the alumina sol 4 for a predetermined time under a reduced pressure condition lower than the atmospheric pressure, and the alumina sol 4 is impregnated between the fibers of the alumina fiber sheet 3 and between the fiber bundles.

After that, the post-heat treatment step S5 is carried out. In the post-heat treatment step S5, the alumina fiber sheet 3 impregnated with the alumina sol 4 is exposed to an atmosphere of 800 ° C. and heated to form a CMC. By forming the CMC, high mechanical strength can be obtained.
Further, by heat-treating the alumina sol 4 at 800 ° C., γ-alumina is formed. High heat resistance can be obtained by forming γ-alumina that is stable against heat.

After performing the impregnation step S4 and the post-heat treatment step S5 at least once, the pin 6 and the fixing jig 8 are removed, and the impregnation step S4 and the post-heat treatment step S5 are carried out again. Through the above steps, a covering body C having a protective coating 1 formed on the outer surface of the base material 2 is obtained.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
A solid round bar (base material 2 without a heater) prepared by using SUS430 with the dimensions shown in FIG. 6 was used as a test piece. As the alumina fiber sheet 3, Nextel (registered trademark) 610 made of high-purity alumina fiber or Nextel (registered trademark) 720 having high alumina purity and containing a mullite component was used.
Further, the performance evaluation of the formed protective film 1 was performed by visual observation of the appearance, surface SEM observation, and cross-sectional SEM observation after the repeated immersion test in the molten aluminum.

<Example 1>
First, a slit 5 is formed in the base material 2, and Nextel (registered trademark) 610 as an alumina fiber sheet 3 is inserted into the slit 5 at one end edge thereof, and then one round is made so as to be in close contact with the outer surface of the base material 2. It was wound and fixed using a fixing jig 8 and a pin 6.
Next, a preheat treatment step at 700 ° C. for 1 hour was carried out using an electric furnace to remove the sizing agent from the alumina fiber sheet 3.
Subsequently, using a container such as a desiccator, the alumina fiber sheet 3 is impregnated with AS-520-A (Nissan Chemical Industries, Ltd.) as an alumina sol 4 under reduced pressure conditions (about 0.095 MPa) from atmospheric pressure for 15 minutes. I let you.
Then, a post-heat treatment step was carried out at 800 ° C. for 15 minutes using an electric furnace.
The impregnation step and the post-heat treatment step were performed again under the above conditions.
Further, the fixing jig 8 and the pin 6 were removed, and the impregnation step and the post-heat treatment step were performed again under the above conditions to obtain a coated body C on which the protective film 1a was formed.

<Example 2>
The protective film 1b was formed through the same steps as in Example 1 except that Nextel (registered trademark) 720 was used as the alumina fiber sheet 3.

<Example 3>
The protective film 1c was formed through the same steps as in Example 1 except that the impregnation step and the post-heat treatment step were performed four times before removing the fixing jig 8 and the pin 6.

<Example 4>
The protective film 1d was formed through the same steps as in Example 2 except that the impregnation step and the post-heat treatment step were performed 6 times before removing the fixing jig 8 and the pin 6.

<Comparison example>
As a comparative example, a base material 2 of SUS430 that does not form the protective film 1 was used.

<Repeated immersion test for molten aluminum>
For the molten aluminum (ADC12) heated to 750 ° C using an electric furnace (heater type carbon fiber pot furnace, 5 kW, Max 1200 ° C, manufactured by Kyoei Electric Furnace), use an elevating device to move the protective film 1 in the long direction. It was repeatedly moved up and down along the same to perform a repeated immersion test in the molten aluminum for 150 hours. The ascending / descending speed was one round trip per second, and the operating stroke was 50 mm. The height of the protective coating 1 is adjusted so that the base end side 1/3 is always in the air, the central third is the gas-liquid police box, and the tip side 1/3 is always in the liquid, and the test is conducted. Carried out.

<Appearance observation results>
Repeated immersion tests were performed on the molten aluminum, and the appearance was visually observed.
FIG. 7 is a photograph showing a state of a comparative example after repeated immersion tests in molten aluminum. FIG. 8 is a photograph showing the state of Examples 1-4 after the repeated immersion test in the molten aluminum.
In the comparative example, as is clear from FIG. 7, erosion was observed 45 minutes after the start of the test. Significant dissolution loss was confirmed in the tip-side one-third, which is always in the liquid. In addition, the solid metal derived from the molten aluminum was significantly adhered to the gas-liquid alternating portion.

On the other hand, in the protective coating 1a-1d formed in Example 1-4, even at the end of the 150-hour test, as is clear from FIG. 8, a slight adhesion of solid metal to the tip of the protective coating 1a-1d was confirmed. There was no change in appearance except that it was done and that blackening was confirmed in the gas-liquid alternation part. Therefore, it can be seen that the protective film 1a-1d has high heat resistance and excellent wettability against molten aluminum.

<Surface SEM observation results>
After the repeated immersion test in the molten aluminum, the surfaces of the protective coatings 1a and 1b were observed using SEM for Examples 1 and 2.
As a result, no significant damage to the CMC was confirmed in any of the protective coatings 1a and 1b, and good results were obtained. Therefore, it can be seen that the protective coatings 1a and 1b have high corrosion resistance to the molten aluminum. Further, it is self-evident that the same results as those of the protective coatings 1a and 1b can be obtained for the protective coatings 1c and 1d which have undergone more impregnation steps and post-heat treatment steps than the protective coatings 1a and 1b.

<Cross-section SEM observation results>
After the repeated immersion test in the molten aluminum, the cross sections of the base materials of Examples 1 and 2 and Comparative Examples were observed using SEM.
FIG. 9 (a) is an SEM image of a cross section of the base metal of the comparative example after the repeated immersion test in the molten aluminum, and FIG. 9 (b) is an SEM image of the cross section of the base metal of Example 1 after the repeated immersion test in the molten aluminum. 9 (c) is an SEM image of a cross section of the base metal of Example 2 after repeated immersion tests in molten aluminum.
As is clear from FIG. 9A, the base material 2 of the comparative example has a thick corrosive layer formed from the surface to the inside of the base material 2.
On the other hand, as is clear from FIGS. 9 (b) and 9 (c), no corrosive layer was observed in the base materials of Examples 1 and 2, and good results were obtained. Therefore, it can be seen that the protective coatings 1a and 1b have high corrosion resistance to the molten aluminum. Further, it is self-evident that the same results as those of the protective coatings 1a and 1b can be obtained for the protective coatings 1c and 1d which have undergone more impregnation steps and post-heat treatment steps than the protective coatings 1a and 1b.

The protective coating 1 in the above form is made of a ceramic-based composite material (CMC) including an alumina fiber sheet 3 formed in a woven fabric shape and alumina formed from an alumina sol 4 having low viscosity and non-tixo property, and is made of SUS430. By covering the outer surface of the base material 2 made of the material, the base material 2 can be protected from the molten aluminum.
According to the protective film 1 thus formed, the alumina sol 4 is efficiently impregnated between the fibers of the alumina fiber sheet 3 and between the fiber bundles by using the low-viscosity and non-tixo-free alumina sol when forming the CMC. Therefore, good corrosion resistance to molten aluminum can be obtained. Therefore, by using the covering body C in which the protective coating 1 having corrosion resistance, heat resistance and mechanical strength against molten aluminum is formed on the base material 2, aluminum that can be used for a long period of time without requiring frequent maintenance is used. It becomes possible to manufacture a holding container for molten metal and the like.

Further, the protective film 1 is formed through a step of impregnating the alumina fiber sheet 3 with the alumina sol 4 under reduced pressure conditions.
Therefore, since the alumina sol 4 can be efficiently impregnated between the fibers of the alumina fiber sheet 3 and between the fiber bundles, the protective film 1 exhibiting poor wettability to the molten aluminum and having high corrosion resistance to the molten aluminum can be obtained.

Further, the protective film 1 is characterized by containing γ-alumina.
Therefore, by containing stable γ-alumina, the protective film 1 having high heat resistance can be obtained.

Further, one end edge of the alumina fiber sheet 3 is inserted into the slit 5 formed in the base material 2.
Therefore, since one end edge of the alumina fiber sheet 3 can be fixed to the base material 2, it becomes easy to process the alumina fiber sheet 3 along the shape of the base material 2. In addition, it is possible to prevent problems such as the alumina fiber sheet 3 being unraveled during CMC formation.

The above is a description of the present invention based on the illustrated examples, and the technical scope thereof is not limited thereto. For example, the base material may be used for purposes other than the heater. Further, the shape of the base material is not limited to the round bar shape, and any shape such as a plate shape, a tubular shape, a gutter shape (including a U shape), and the like can be selected. Further, as for the material of the base material, any material can be selected according to the application.
Further, the ceramic fiber may be in the form of a woven fabric, and the weaving method thereof is not limited.
Further, the material of the ceramic fiber is preferably mainly containing alumina, but can be arbitrarily selected.
Further, the composition of the alumina sol is not limited as long as it mainly contains alumina and has low viscosity and non-tixo property.
Further, the use of the protective film and the covering body is not limited to the holding of the molten aluminum, and can be used for any use such as holding and transporting other molten metals and arbitrary fluids, solids or gases.

1 ... Protective coating (ceramic base composite material member), 2 ... base material (base material), 3 ... alumina fiber sheet (ceramic fiber), 4 ... alumina sol, 5 ... slit (insertion part), 6 ...・ Pin, 8 ・ ・ Fixing jig.

Claims (16)

With ceramic fiber
Containing alumina formed from the alumina sol impregnated in the ceramic fibers,
The alumina sol is a ceramic-based composite material member characterized by being non-tixotic. The ceramic-based composite material member according to claim 1, wherein the alumina sol has a viscosity of 100 mPa · s or less. The ceramic-based composite material member according to claim 1 or 2, wherein the alumina sol and the ceramic fiber do not contain a heat radiating agent. The ceramic-based composite material member according to any one of claims 1 to 3, wherein the alumina sol is impregnated under a reduced pressure lower than atmospheric pressure. The ceramic-based composite material member according to any one of claims 1 to 4, wherein the alumina contains γ-alumina. The ceramic-based composite material member according to any one of claims 1 to 5.
Includes a substrate that is partially or wholly covered by the ceramic-based composite material member.
The base material has an insertion portion and has an insertion portion.
A ceramic-based composite material member covering, wherein a part or all of the edge of the ceramic-based composite material member is inserted into the insertion portion. The ceramic-based composite material member according to any one of claims 1 to 5.
Includes a substrate that is partially or wholly covered by the ceramic-based composite material member.
The base material has an end portion and has an end portion.
The ceramic-based composite material member covering is characterized in that the ceramic-based composite material member is covered beyond the end portion of the base material, and the excess portion is sealed by being crushed. A method for producing a ceramic-based composite material member, which comprises an impregnation step of impregnating a ceramic fiber with a thixo-free alumina sol. The method for manufacturing a ceramic-based composite material member according to claim 8, wherein the alumina sol has a viscosity of 100 mPa · s or less. The method for producing a ceramic-based composite material member according to claim 8 or 9, wherein the alumina sol and the ceramic fiber do not contain a heat radiating agent. The method for producing a ceramic-based composite material member according to any one of claims 8 to 10, wherein in the impregnation step, the alumina sol is impregnated under a reduced pressure lower than atmospheric pressure. The method for producing a ceramic-based composite material member according to any one of claims 8 to 11, further comprising a preheat treatment step for heating the ceramic fiber before the impregnation step. The ceramic-based composite material member according to any one of claims 8 to 12, further comprising a post-heat treatment step of exposing the ceramic fiber impregnated with the alumina sol to an atmosphere of 800 ° C. or lower after the impregnation step. Manufacturing method. A coating process in which a part or all of the base material is covered with ceramic fibers,
A method for producing a ceramic-based composite material member coating, which comprises an impregnation step of impregnating the ceramic fiber covering the base material with a thixo-free alumina sol. The ceramic-based composite material according to claim 14, wherein in the coating step, a part or all of the edge of the ceramic-based composite material member is inserted into the insertion portion of the base material having the insertion portion. A method for manufacturing a member covering body. In the coating step, the base material having an end portion is coated with the ceramic group composite material member beyond the end portion of the base material, and the excess portion is sealed by crushing. The method for manufacturing a ceramic-based composite material member coating according to claim 14 or 15.

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