TW201607915A - Method for producing carbon fiber reinforced silicon carbide molded body - Google Patents

Abstract

The present invention provides a method for producing a C/SiC article in which extraneous matter of residue Si on surface and variation of Si in the internal portion are suppressed. The method for producing a C/SiC article of the present invention comprises: a C/C block formation step S4, in which a C/C block is formed by calcination of resin and carbon fiber; a semi-finished product formation step S5, in which the C/C block into a plurality of semi parts; a semi-finished product fixing step S6, in which each of the semi parts is fixed in each of a plurality of concave parts of a silicon providing jig by a fixing means; silicon providing step S7, in which a silicon is provided in the concave parts; a silicon-melting and impregnating step S8, in which Si is impregnated into the inner part of the semi-finished parts by heating and melting the Si; and a non-processed-finished product removing step S9, in which a non-processed processed parts composed of C/SiC by impregnation of Si into the semi-parts and chemical reaction is removed from the silicon providing jig at the fixing means.

Description

Method for producing carbon fiber-reinforced carbonized niobium formed body

The present invention relates to a method for producing a molded body comprising a composite material of carbon fiber-reinforced tantalum carbide (C/SiC) having high rigidity, electric resistance value and high thermal conductivity.

In general, machine parts and the like require high characteristics, good workability, and low manufacturing cost, so metal members are often used.

However, the metal has a high specific gravity, and in a machine using a magnet or the like, there is a problem due to the influence of its electrical characteristics. For example, there is a problem of heat generation due to an eddy current due to a magnetic field and poor heat dissipation.

Therefore, the use of plastics or the like as a lightweight member is increasing, but the range of application is limited due to poor mechanical properties.

Therefore, it is expected that a machine-based material having a mechanical property equivalent to that of a metal and having no conductivity and thus not being affected by a magnet is expected. Among them, a review is made to apply a composite material having a ceramic on a substrate.

The application of a part of a molded product composed of a carbon fiber-reinforced cerium carbide (C/SiC) composite material as a ceramic matrix composite material is under study Research.

Since the composite material of C/SiC has high rigidity, electric resistance value, and high thermal conductivity, it is not affected by eddy current and has high heat rejection characteristics, and therefore is suitable as a material for solving the above problems.

In the method of producing a component having a complicated shape using the C/SiC composite material, for example, in the production method described in Patent Document 1, first, after mixing the raw material powder, the pressure molding is performed to a larger shape than the intended shape. After the block shape, a carbon fiber-reinforced carbon (C/C) block in which carbonization of the raw material resin is performed is formed.

Next, the C/S block is formed into a semi-molded article having a shape close to the final shape by cutting and polishing, and then cerium (Si) is melt-impregnated into the semi-molded article, thereby producing C/S. A component made of a composite material of SiC is a molded article.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent No. 5068218

In the production of the component composed of the composite material of C/SiC described above, when Si is impregnated, Si is melted by excessively disposing the metal Si on the upper surface and the lower surface of the semi-molded article, so that many Si are attached to the surface. The residue is removed by mechanical processing to remove the residual Si in the final finishing step.

However, in the step of removing residual Si by machining, it takes a long time, and the manufacturing time of the parts of the formed body composed of the C/SiC composite material is increased, and in particular, the mass production of small parts is greatly hindered. The problem.

Further, in addition to the surface deposits, there is a difference in the specific gravity of C/C and Si when Si is melted, and C/C floats in the molten Si, which causes a problem of unevenness of Si inside the part.

In order to solve such a problem, an object of the present invention is to provide a method for producing a carbon fiber-reinforced tantalum carbide molded body, which is capable of suppressing residual Si on a surface when a molded body composed of a carbon fiber-reinforced tantalum carbide composite material is produced. The deposits and the Si inside are uneven.

The method for producing a carbon fiber-reinforced tantalum carbide molded body according to the present invention comprises: a carbon fiber-reinforced carbon block forming step of forming a carbon fiber-reinforced carbon block obtained by sintering a resin and carbon fibers; and a semi-molded product forming step of the carbon fiber-reinforced carbon Forming a plurality of semi-molded articles by block processing; fixing the semi-molded articles to a plurality of recessed portions formed in the cymbal arranging aid by fixing means; and arranging the cymbal The depressed portion; the enthalpy melt impregnation step, wherein the ruthenium is impregnated into the interior of the semi-molded article by heating the ruthenium, and the ruthenium is impregnated into the semi-formed product by a step of removing the unprocessed molded article An unprocessed product comprising carbon fiber-reinforced lanthanum carbide produced by a chemical reaction is removed from the arranging aid at a portion of the fixing means; and a finishing step is performed to finish the unprocessed product A molded article is formed.

According to the method for producing a carbon fiber-reinforced yttrium carbide formed article of the present invention, after the semi-molded article is fixed to the depressed portion of the arranging auxiliary device in which the enamel is disposed by the fixing means, the heat-melted ruthenium is impregnated into the half The inside of the molded product. As a result, a deposit of residual ruthenium on the surface and a carbon fiber-reinforced yttrium carbide formed body in which unevenness in the interior of the crucible is suppressed can be obtained.

1, 20‧‧‧ parts (formed products)

2, 21‧‧‧ small diameter department

3, 22‧‧‧ Large Path Department

4‧‧‧PAN carbon fiber

5‧‧‧Asphalt fiber

6‧‧‧ phenol resin particles

7‧‧‧Graphite particles

8‧‧‧ mixed powder

9‧‧‧Metal mold

10‧‧‧Carbon fiber-reinforced carbon (C/C) blocks

11, 24‧‧‧Half parts (semi-finished products)

12, 25‧‧‧矽 configuration aids

13, 26‧‧ ‧ male thread department

14‧‧‧矽(Si)

15, 23‧‧‧ female thread

16‧‧‧BN coating

17, 27‧‧‧Depression

18, 28‧‧‧Unprocessed parts

19, 29‧‧ ‧ remnants

30‧‧‧Blocked structures

S1 to S10‧‧‧ steps

Fig. 1 is a flow chart showing a method of producing a carbon fiber-reinforced tantalum carbide member according to Embodiment 1 of the present invention.

Fig. 2(a) is a front view of a part manufactured by the manufacturing method of Fig. 1, and Fig. 2(b) is a plan view of Fig. 2(a).

Fig. 3 (a) and (b) are views showing a powder press forming step of the manufacturing steps of the parts of Fig. 2.

Figure 4 is a graph showing the change in weight of a phenol resin.

Fig. 5 (a) and (b) are views showing half of the parts in the middle of the manufacture of the parts of Fig. 2.

Figure 6 (a) is a melt impregnation after the manufacturing steps of the parts in Figure 2. A plan view of the carbon-based arranging aid used in the step, and Fig. 6(b) is an arrow sectional view taken along line A-A of Fig. 6(a).

Fig. 7 is a view showing the enthalpy of the enthalpy of the manufacturing process of the parts of Fig. 2;

Fig. 8 is a view showing the unprocessed part removing step of the part manufacturing step of Fig. 2.

Fig. 9 is a graph comparing the yield of the unprocessed parts obtained by the first embodiment and the unprocessed parts obtained by the conventional method.

Fig. 10 is a graph comparing the specific gravity of the unprocessed part obtained by the first embodiment and the unprocessed part obtained by the conventional method.

Fig. 11 is a partial cross-sectional plan view showing a part produced by the method for producing a carbon fiber-reinforced tantalum carbide member according to the second embodiment of the present invention.

Fig. 12(a) is a front sectional view showing a carbon-made arranging aid used in the enthalpy melting step of the part manufacturing step of Fig. 11, and Fig. 12(b) is a part manufacturing step of Fig. 11. The graph of the melt impregnation step is followed.

Fig. 13 is a view showing the unprocessed part removing step of the part manufacturing step of Fig. 11.

In the following, a method of producing a carbon fiber-reinforced cerium carbide (C/SiC) molded body according to each embodiment of the present invention will be described with reference to the drawings, and the same or equivalent members and portions will be denoted by the same reference numerals throughout the drawings.

Further, the present invention is not limited to the following embodiments, as long as it is not off Any change can be made within the scope of the gist of the invention.

(Embodiment 1)

Fig. 1 is a flow chart showing a method of manufacturing a C/SiC part according to the first embodiment of the present invention, and Fig. 2(a) is a view showing a part 1 of a molded body produced by the manufacturing method shown in Fig. 1. The front view, Fig. 2(b) is a plan view of Fig. 2(a).

The part 1 is composed of a small-diameter portion 2 having a cylindrical shape and a hollow large-diameter portion 3, and the small-diameter portion 2 has a length of several tens of mm, and the large-diameter portion 3 has a smaller diameter portion 2 The diameter is tens of mm in diameter and the length is the same as that of the small diameter portion 2.

First, a method of manufacturing the component 1 will be described based on the flowchart of Fig. 1.

When the component 1 is produced, first, each raw material of the PAN-based carbon fiber 4, the pitch-based fiber 5, the phenol resin particle 6, and the graphite particle 7 is mixed to prepare a mixed powder (S1: raw material powder mixing step) .

Next, the mixed powder 8 is press-formed (S2: powder press forming step).

Thereafter, the phenol resin particles 6 are heat-cured by pressure heat forming to form a carbon fiber reinforced resin (CFRP) (S3: resin hardening step in powder).

Next, the phenol resin in the CFRP is carbonized to form a carbon fiber-reinforced carbon (C/C) block (S4: C/C bulk forming step).

Next, the C/C block is processed into a desired shape to form a half-piece of the semi-molded article (S5: semi-molded article forming step).

After that, the half part is fixed by the fixing means in the configuration Each recessed portion of the auxiliary tool (S6: semi-molded article fixing step).

Thereafter, the crucible is placed in the recessed portion of the crucible configuration aid (S7: 矽 configuration step).

Then, Si is heated and melted, whereby Si is impregnated into the interior of the half part by capillary action, and carbon (C) in the composition is carbonized (SiC) by chemical reaction to form C/SiC. An unprocessed part of the unformed molded product (S8: 矽 melt impregnation step).

Next, the unprocessed part is broken by the fixing means from the 矽 placement aid, and is removed from the 矽 placement aid (S9: Unprocessed product removal step).

Finally, the unprocessed part is finished to form the part 1 of the molded product (S10: finishing step).

Next, a method of manufacturing the component 1 of the molded body comprising the composite material of C/SiC according to the first embodiment of the present invention will be described in further detail with reference to Figs. 3 to 10 .

In the raw material powder mixing step S1, each raw material of the PAN-based carbon fiber 4, the pitch-based fiber 5, the phenol resin particles 6, and the graphite particles 7 is loaded into a mixer at a specific weight ratio, and then uniformly mixed. The mixed powder 8 was obtained.

In the powder press molding step S2, as shown in Fig. 3 (a) and (b), the mixed powder 8 is introduced into the mold 9 and the softening temperature by the phenol resin particles 6 (70 ° C) The bulk structure 30 is formed by pressurization at the following temperature.

The formation of the block structure 30 can be utilized in addition to the method of press forming by the metal mold 9, and can also be utilized in the manufacture of FRP materials. General injection molding method, etc.

The material density of the bulk structure 30 in the temporarily hardened state is pressurized at a condition of 0.8 to 0.9 g/cm ³ , whereby the impregnation efficiency in accordance with the Si impregnation and the cylindrical structure as the attachment difference can be produced. The material composition ratio of the rigidity of the part 1 is a component 1 composed of a composite material of SiC of 70 to 80%, C of less than 10%, and Si of 15 to 20% of C/SiC.

The material density of the temporarily hardened bulk structure 30 is controlled by adjusting the amount of pressurization in accordance with the characteristics of the molded article and the material composition ratio.

In the resin hardening step S3 in the above-described powder after the formation of the bulk structure 30, the bulk structure 30 which has been temporarily hardened is subjected to resin curing conditions, for example, phenol resin at 15 ° C for 1 hour. Hardening is performed, whereby a bulk CFRP structure can be formed. In the curing step of the phenol resin, it is carried out in an oven without being pressurized.

In the C/C bulk forming step S4 after the CFRP structure is formed, the CFRP structure is carbonized to form a C/C block shown in Fig. 5(a) composed of a C/C composite material. 10.

In the present embodiment, carbonization was carried out under the conditions of a temperature increase rate of 10 ° C / min in a vacuum atmosphere at 800 ° C for 1 hour.

Fig. 4 shows the results of measurement of the phenol resin by a thermal analysis device (TGA).

The horizontal axis temperature and the left vertical axis show the weight of the material at each temperature when the initial weight of the material is 100%, and the right vertical axis shows the weight per unit temperature. Rate of change.

As a result, it was confirmed that the weight began to change rapidly in a temperature region exceeding 375 ° C, and the thermal decomposition was almost completed up to 550 ° C.

According to the results, in the CFRP structure using the phenol resin, the carbonization conditions are as shown in the data of the TGA measurement of the phenol resin as shown in Fig. 4, which is based on the rapid thermal decomposition. It is ideal to carry out the above 600 °C.

Since this condition differs depending on the carbonization conditions of the resin to be used, when a resin material other than the phenol resin is used as the material to be used, the carbonization temperature must be determined depending on the result of analysis of the material obtained by using the resin.

Further, since the atmosphere in the carbonization treatment must prevent oxidation and reaction of the carbon material, it is not limited to the vacuum atmosphere shown in the present embodiment, and is also included in an inert atmosphere such as argon or a nitrogen atmosphere.

In the semi-molded article forming step S5 after the C/C block 10 is formed, as shown in Fig. 5(b), the C/C block 10 is formed into a semi-molded article by general machining. Half part 11.

The half piece 11 has a male thread portion 13.

In addition to the carbon arranging aid 12 used for fixing the semi-molded article fixing step S6 in the next step, the male screw portion 13 also has a break in the valley portion in the unprocessed molded article removing step S9. The stress concentration portion of the male screw portion 13.

The processed shape of the half part 11 is a shape which is considered to be a final desired shape after impregnation of Si 14 in consideration of volume shrinkage caused by impregnation of Si 14 in the subsequent tantalum melt impregnation step S8.

In this case, it is estimated that there is a shrinkage of 0.3 to 0.5% in the diameter direction to perform processing including the shape of the final machining allowance.

The diameter of the male screw portion 13 must be changed according to the shape of the necessary component. However, when the diameter of the valley portion of the male screw portion 13 is increased, it is difficult to break the male screw portion 13 in the unprocessed molded product removing step S9. The diameter of the male screw portion 13 may be determined within a range in which the male screw portion 13 can be broken in the unprocessed molded article removal step S9.

Usually, the diameter of the male thread portion 13 is preferably M6 or less.

Further, in the present embodiment, the male screw portion 13 is the same member that is integrated with the half piece 11, and for example, the fixed half piece is fixed by the transmission relay member in comparison with the cymbal arrangement aid, and since there is no relay member, It is ensured that Si is immersed in the internal uniformity of each of the unprocessed parts 18 (Fig. 8), and the quality of each part 1 when a large number of parts 1 are manufactured can be extremely reduced.

In the above-described semi-molded article fixing step S6 after the half-piece 11 is formed, the crucible-distributing aid 12 made of carbon having the BN-coated 16 on the surface shown in Fig. 6 is used.

In the carbon argon arrangement assisting device 12, a plurality of depressed portions 17 are formed at equal intervals. A female thread 15 is formed at a central portion of the bottom surface of the recessed portion 17.

By screwing the male screw portion 13 of the half part 11 to the female screw portion 15, the half piece 11 is fixed to the cymbal placement aid 12 as shown in Fig. 7.

In addition, the male threaded portion 13 and the cymbal configuration aid of the half part 11 The female screw portion 15 of 12 constitutes a fixing means for fixing the half piece 11 to the cymbal placement aid 12.

Next, the flaky Si 14 before melting is placed in the depressed portion 17 (矽 arrangement step S7), and then the 矽 arrangement assisting device 12 is heated to melt the Si 14 . The molten Si 14 is caused to rise due to capillary action and is impregnated into the interior of the half part 11.

Further, the Si 14 system is impregnated from the lower portion of the half part 11 by capillary action, and the molten Si 14 can be supplied to the inside of the half part 11 from the upper portion and the side surface portion.

In the present embodiment, the amount of Si 14 supplied is 9.0 g per half part 11. The amount of Si 14 is obtained from the shape and density calculation of the part 1 of the final molded article.

Further, Si 14 is subjected to heat treatment under the conditions of a temperature increase rate of 7 ° C/min and 150 ° C in a vacuum atmosphere, and is melted and impregnated, and is formed by chemical reaction of the semi-parts 11 and C of the semi-molded article. Unprocessed part 18 made of C/SiC.

Regarding the temperature increase rate and the impregnation temperature in the heat treatment, the temperature of each can be changed, thereby changing the final composition of the component 1.

The BN coating 16 applied to the surface of the auxiliary device 12 in the carbon system is used to prevent the reaction with the molten Si 14.

As for the material and coating material of the iridium distribution aid, a material which can withstand the melting temperature of Si 14 and which does not have reactivity with C and Si of the material of the ruthenium auxiliary aid and SiC of the reaction product, for example, BN can be used. Wait.

Unformed in the carbon raft configuration aid 12 The unprocessed part 18 of the product is broken from the valley portion of the male screw portion 13 as shown in Fig. 8 and is removed from the cymbal placement aid 12 (the unprocessed product removal step S9).

At this time, the valley portion of the male screw portion 13 serves as a stress concentration portion, and the male screw portion 13 can be broken without being damaged.

Fig. 9 is a graph showing the yield of the unprocessed product obtained by the conventional method of the male thread portion 13 having no constituent means of the fixing means, and the yield of the unprocessed part 18 obtained by the method of the present embodiment. A diagram to compare.

In the conventional method, although half of the semi-molded article is impregnated into the Si-dissolved enamel-distributing aid and impregnated with Si in the half-piece, the half-piece is fixed to the 矽-configuration aid through the Si and is not processed. Parts are fragmented and so on.

Further, in the present embodiment, it is considered that the chip or the like is generated in the unprocessed molded article removal step S9.

As a result of calculating the yield, in the case of the conventional method, a defective ratio of about 30% was generated, but in the present embodiment, it was 0%, and the yield was improved by 30%.

In addition, Figure 10 shows the ratio of the weight of the unmachined part 18 to the target weight. In the state of C/SiC, in terms of specific gravity, 2.9 g/cm ³ was set as the target specific gravity. Fig. 10 is a view showing the average weight of the entire unprocessed part 18 when the weight of the unprocessed part 18 which is the target specific gravity is 100%, and the error bar (error) when the volume is calculated from the shape of the unmachined part 18. Bar).

In the above conventional method, the parts move due to Si impregnation, etc. On the other hand, the impregnation unevenness of Si was generated, and it was confirmed that the weight was about 5 to 10% with respect to the target specific gravity, and it was confirmed that the error bar was large and the specific gravity was uneven.

On the other hand, in the present embodiment, since the target weight is obtained by the average value and the impregnation unevenness of Si is within 10%, it is confirmed that the unevenness of Si inside the component 1 is improved.

The unprocessed part 18 obtained through each of the above steps S1 to S9 removes the residual portion 19 of the male thread portion 13, and performs finishing of the cutting surface or the like to become a predetermined size to form the part 1 of the final product (finishing step) S10).

The unprocessed part 18 was confirmed to have a shape change of about 0.5% in size in the step of changing from CFRP to C/SiC. The degree of this shape change is equal to or less than the margin (0.7 to 1.0%) of the final shape set in the powder press forming step S2.

That is, a shape having a size of a cutting allowance of 0.5% or less can be produced, and it is confirmed that a structure having a precise shape can be formed by the finishing step S10.

Meanwhile, in the above-described conventional method, it is necessary to cause the adhesion of the Si residue on the surface, and the surface is processed for a long time after the Si is impregnated to obtain the shape accuracy. However, in the present embodiment, the residual adhesion has also been confirmed. Si is generated only in the vicinity of the residual portion 19 of the male screw portion 13 which does not affect the shape of the part 1 as a breaking allowance (the residual adhesion Si is generated in the residual portion 19 because it is to be compared with the half part 11 The Si 14 having a larger amount of Si 14 is disposed in the depressed portion 17). Therefore, compared to the above The conventional method can greatly shorten the time for performing the finishing step S10 by machining.

In addition, it has been confirmed that there is no fixing of the auxiliary arrangement 12 or the like in the component 1, and there is no damage, crack, or the like of the component 1.

Further, since the Si 14 was impregnated into the half part 11 in each of the depressed portions 17, it was confirmed that all of the parts 1 processed at one time were sufficiently impregnated with Si 14, and it was confirmed that the Si was not jagged or impregnated. equal.

It has also been confirmed that the yield of the component 1 can be greatly improved by suppressing the damage, the debris, and the unevenness of the Si of the component 1.

As described above, according to the method for manufacturing the component 1 composed of C/SiC according to the present embodiment, the surface residual Si generated during the manufacture of the conventional C/SiC component can be greatly reduced, so that the need for finishing can be greatly shortened. Time, and good yield can be achieved, especially the mass production of small parts 1.

(Embodiment 2)

Fig. 11 is a partial cross-sectional view showing the part 20 of the molded article obtained by the method of the second embodiment of the present invention, and Fig. 12(a) is a view showing the manufacturing step of the part 20 of Fig. 11 and the molten impregnation step S8. FIG. 12(b) is a view showing a manufacturing step of the part 20 of FIG. 11 and a molten impregnation step S8, and FIG. 13 is a view showing the eleventh. The unprocessed molded article in the manufacturing step of the component 20 of the figure is removed from the diagram of the step S9.

The part 20 is a cylindrical shape having a stepped portion formed by a small diameter portion 21 having a female screw portion 23 of M6 and a hollow large diameter portion 22 having a diameter of 10 mm.

Although the component 20 has the female screw portion 23, when the component 1 obtained by the method of the first embodiment is to form the female screw portion 23, the component 1 is formed of C/SiC having high hardness, so the female screw portion 23 is formed. Processing difficulties.

In the present embodiment, since the female screw portion 23 is formed at the stage of carbon fiber-reinforced carbon (C/C), the component 20 having the female screw portion 23 of M6 can be manufactured.

In the method of manufacturing the component 20 of the second embodiment, the raw material powder mixing step S1 to the C/C bulk forming step S4 are the same as those of the first embodiment.

In the present embodiment, in the semi-molded article forming step S5, the C/C block 10 is machined to form the half-piece 24 of the semi-finished product of Fig. 12(b).

In the crucible melt impregnation step S8, the male screw portion 26 of the carbon assisting device 25 having the BN coating 16 is applied to the surface, the female screw portion 23 of the half member 24 is screwed, and the half member 24 is fixed to矽 Configure the aid 25.

Thereafter, as shown in Fig. 12(b), the flaky Si 14 before melting is placed in the recessed portion 27 around the male screw portion 25 (矽 arrangement step S7), and then the cymbal placement aid 24 is heated. Si 14 melts. The molten Si 14 is impregnated by the capillary phenomenon and impregnated into the interior of the half part 24 (矽 molten impregnation step S8).

Thereafter, in the unprocessed molded article removal step S9, the male screw portion 26 of the arranging assisting device 24 is broken, and the unprocessed component 28 of the unprocessed molded article is removed from the cymbal arranging aid 24.

At this time, the valley portion of the male screw portion 26 serves as a stress concentration portion, and the male screw portion 26 can be broken without being damaged.

In the unprocessed part 28 obtained thereby, there is no deposit or damage, and there is no unevenness of Si impregnation.

After that, the residual portion 29 of the male screw portion 26 that is screwed to the unmachined part 28 is removed by machining, and the cutting is performed to a predetermined size, and the part 20 having the female screw portion 23 can be easily manufactured ( Finishing step S10).

Further, in the above-described first and second embodiments, the component 1 having the cylindrical structure with a stepped difference has been described as a molded body, but it is of course not limited to the shape and size, and is not limited to the component.

Further, although the male screw portions 13 and 26 and the female screw portions 15 and 23 are used as the fixing means as the fixing means, for example, one of the half parts or the cymbal arrangement assisting device may be formed to have a circumferential direction. The column portion of the groove is formed, and the other portion of the cymbal arrangement aid or the half piece is formed as a concave portion that is engaged with the column portion, and is a fixing means having the column portion and the concave portion as constituent elements.

4‧‧‧PAN carbon fiber

5‧‧‧Asphalt fiber

6‧‧‧ phenol resin particles

7‧‧‧Graphite particles

8‧‧‧ mixed powder

S1 to S10‧‧‧ steps

Claims (10)

A method for producing a carbon fiber-reinforced carbonized niobium formed body, comprising: a carbon fiber-reinforced carbon block forming step, forming a carbon fiber-reinforced carbon block obtained by sintering a resin and carbon fibers; and a semi-molded product forming step, the carbon fiber-reinforced carbon block Forming a plurality of semi-molded articles by a body process; and fixing the semi-molded articles to a plurality of recessed portions formed in the argon-arrangement aid by a fixing means; and arranging the rafts in the foregoing a depressed portion; a crucible melt impregnation step, wherein the crucible is impregnated into the interior of the semi-molded article by heating the crucible, and the unprocessed product is removed, and the crucible is impregnated into the semi-molded article and borrowed An unprocessed product comprising carbon fiber-reinforced lanthanum carbide produced by a chemical reaction is removed from the arranging aid at a portion of the fixing means; and a finishing step is performed to finish the unprocessed product to form a molded article . The method for producing a carbon fiber-reinforced cerium carbide formed article according to the first aspect of the invention, wherein the carbon fiber-reinforced carbon block forming step is carbonized in an inert atmosphere. The method for producing a carbon fiber-reinforced cerium carbide formed article according to the first or second aspect of the invention, wherein in the enthalpy melt impregnation step, the carbon fiber-reinforced lanthanum carbide is formed under the vacuum atmosphere The above-mentioned unprocessed molded article. The method for producing a carbon fiber-reinforced cerium carbide formed article according to the first aspect or the second aspect, wherein the lanthanum melt impregnation step is caused by a capillary phenomenon and impregnated into the semi-molded article. The aforementioned internal. The method for producing a carbon fiber-reinforced cerium carbide molded article according to the first or second aspect, wherein the fixing means is formed by a male screw portion formed in the semi-molded article and formed in the cymbal arranging aid And the female thread portion of the male screw portion is screwed, and the semi-molded product is broken at the valley portion of the male screw portion and is removed from the cymbal placement aid. The method for producing a carbon fiber-reinforced cerium carbide molded article according to the first or second aspect of the invention, wherein the fixing means is formed by a male screw portion formed in the cymbal placement aid and formed in the semi-molded article And the female thread portion of the male screw portion is screwed, and the semi-molded product is broken at the valley portion of the male screw portion and is removed from the cymbal placement aid. The method for producing a carbon fiber-reinforced carbonized niobium formed body according to the first or second aspect of the invention, wherein the fixing means is a column portion formed on one of the tantalum placement aid and the semi-molded article, and The semi-molded article is formed in the other half of the semi-molded article and the cymbal arrangement aid, and the recessed portion is fitted to the column portion, and the semi-molded article is broken at the column portion and is removed from the cymbal placement aid. Carbon fiber reinforced carbonized niobium forming as described in claim 7 In the method of manufacturing a body, the column portion has a groove portion extending in a circumferential direction. The method for producing a carbon fiber-reinforced cerium carbide formed article according to the first or second aspect of the invention, wherein the arranging aid is a carbon arranging aid. The method for producing a carbon fiber-reinforced cerium carbide formed article according to claim 9, wherein the argon-arranged auxiliary device made of carbon is coated with BN on the surface.