JPS60226406A - Preparation of beta-silicon carbide - Google Patents

Abstract

PURPOSE:To prepare easily sinterable SiC powder with high efficiency, by firing a specific with high efficiency, by firing a specific precursor material containing Si, O and C in a nonoxidizing atmosphere. CONSTITUTION:(A) A liquid silicon compound, e.g. a compound prepared by dccomposing an aqueous solution of an alkali silicate with an acid or dealkalizing the solution, is incorporated with (B) a liquid organic compound, having functional group, and forming carbon by heating, e.g. a liquid phenolib resin with a high residual carbon ratio, at about 1<C/Si<10 ratio (atomic ratio, provided that C is expressed in terms of residual carbon content at 800-1,400 deg.C) and further with (C) a polymerization or crosslinking catalyst to give a mixture, which is then heat-treated at about 600-1,000 deg.C in an inert gas atmosphere to form a homogeneous amorphous material containing Si, O and C. The resultant amorphous material is then heat-treated at about 1,400-2,000 deg.C in a nonoxidizing atmosphere to prepare the aimed beta-silicon carbide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing silicon carbide (hereinafter referred to as SiC). More specifically, the present invention relates to a method for producing fine, 3C, IA single-phase, easily sinterable β-type SiO powder.

SiC sintered bodies have high hardness and strength, excellent heat resistance, and are chemically stable, so they are widely used in wear-resistant mechanical parts, twisted materials, heat-resistant materials, and the like.

5i (3 powder has two crystal forms, α and β, and β toughness S
Conventionally known methods for producing iO powder include (1) reaction of S102 and C, (2) reaction of 5ki- and C, and (3) gas phase synthesis from Si compounds and hydrocarbons. Industrially, it is produced by the method (1) above. This is due to one of the following reactions at high temperatures.

5in2+ 3C→SiC+ 2CO(9)N) However, (2) represents a scum-like substance.

Since the reaction (2) is a non-uniform body-gas reaction, it is difficult to obtain a homogeneous powder with a uniform particle size.
A small amount of iO is mixed in. This α-3iC promotes grain growth during sintering and is harmful to densification.

Therefore, the reaction (1) above is used, but in order to promote the reaction (1), it is necessary to uniformly mix 5in2 and C, and various methods of mixing have been proposed in the past. There is.

For example, if a silicic acid solution is used instead of the solid powder that has traditionally been used as a raw material, and a carbonaceous powder is used, it is possible to obtain a uniform carbonaceous material by treating the carbon precursor, i.e., by mixing it in the liquid phase. There is a known method (Japanese Unexamined Patent Publication No. 88019/1983) in which SiO is produced by obtaining a pickled metal and heating the mixture in a non-oxidizing atmosphere.

However, according to this method, although a physically homogeneous product is obtained, silica sol is generated and molecularly non-uniform, and when producing SiO, α of 2H is added to β-type SiC powder.
There was a problem in that several percent or more of the -8iC phase was present, making it impossible to obtain single-phase β-type SiC.

The present invention was made to solve this problem, and its purpose is to provide a method for producing single-phase β-type SiC using raw materials that are molecularly uniformly mixed.

As a result of research to achieve the above object, the present inventors used a liquid silicon compound and a liquid organic compound as a carbon source that has a functional group and produces carbon when heated, and uniformly dissolved this mixture and catalyst. After that, it is made into sand by polymerization or crosslinking reaction, and Si, Ol and C are molecularly uniformly mixed.
It was discovered that single-phase β-type SiC can be obtained by using this as a raw material, and based on this knowledge, the present invention was completed.

That is, the gist of the present invention is to produce silicon carbide by heating a raw material containing silicon and carbon in a non-oxidizing atmosphere, and to produce silicon carbide by heating a raw material containing a liquid silicon compound and a sulfuric functional group. A process for producing β-type silicon carbide characterized by using a precursor material containing Sl, 0, and C obtained by uniformly dissolving the produced liquid organic compound and polymerization or crosslinking catalyst, and then subjecting it to offshore or crosslinking reaction. It's in the manufacturing method.

Examples of liquid silicon compounds used in this study include (1) those obtained by acid decomposition or dealkalization of an aqueous alkali silicate solution, such as silicic acid polymers obtained by dealkalization of water glass, (2) Esters of organic compounds with OH groups and silicic acid, such as a group of polymers obtained by trimethylsilylation of silicic acid polymers, as shown below Color) Esters of hydrolyzable silicic acid compounds with organic or organometallic compounds, such as ethyl Examples include silicate C2H5.

As a carbon source, liquid organic compounds that have a functional group and generate carbon when heated, especially those with a high residual carbon content, catalysts or IJI
Organic compounds that undergo υ polymerization or crosslinking by I heat, such as resins such as phenol resin, furan resin, polyimide, polyurethane, polyacrylonitrile, polyvinyl alcohol, and polyvinyl acetate, are preferred, and in addition, cellulose, sucrose, and pitch.

Tar and the like can also be used.

A liquid organic compound having a functional group and a polymerization or crosslinking catalyst is dissolved in the liquid silicon compound, and a polymerization or crosslinking reaction is carried out by heating to obtain a solid.

Polymerization, crosslinking, or crosslinking reaction is carried out between (1) the functional group-containing organic compound and the liquid silicon compound, and (2) the functional group-containing liquid organic compound.

(2) Reaction between the silanol group in the silicic acid polymer and the methylol group of the organic compound A solid is formed by the reaction H2.

The catalyst may be selected from catalysts used in polymerization or crosslinking reactions, and includes, for example, mineral acids such as hydrochloric acid, sulfuric acid, and oxalic acid, alkalis such as sodium ethylate, organic peroxides, and organic sulfonic acids.

The mixing ratio of a liquid silicon compound and a liquid organic compound having a functional group is such that the atomic ratio of C and 81 is 1〈0/SIL, calculated by the amount of residual carbon in the organic compound at 800 to 1400°C.
<10, preferably (3/Si23). If C remains in the synthesized precursor material, C/Si>3.

Add a polymerization or crosslinking catalyst to the mixture in the above ratio.
When a metal article is treated at 600-1000''C in an inert gas atmosphere, a homogeneous non-article containing Si, O, and C is obtained.

SiC is obtained by heat-treating this non-article at 1400 to 2000°C in a non-oxidizing atmosphere, such as vacuum, nitrogen, helium, or argon. The heat treatment temperature is preferably around 1,600°C; if it is lower than 1,400°C, the reaction is slow, and there is no need for a temperature exceeding 2,000°C, so 1. Such temperatures are economically disadvantageous.

The obtained SiO powder was fine and had a uniform particle size distribution, and as a result of X-ray analysis, it was found to be β-8iO powder containing no α phase such as 2H.

Furthermore, when the Si/C molar ratio in the raw material is set to 3, a pure β-type SiC powder with no residual carbon can be obtained, and no decarburization purification treatment is required.

Example 1 Ethyl silicate containing 41% by weight of 5in2 was used as a liquid silicon compound, and a resol type phenol resin with a residual carbon content of 40% was used as a liquid organic compound having a functional group.

62% by weight of ethyl nosilicate and 38% of the phenolic resin
The weight percent mixture was cured under acid catalyst to obtain a transparent resinous solid. This was heated under a nitrogen atmosphere at a heating rate of 10°C/
It was heated to 1000°C at min.

The obtained solid was a homogeneous and dense solid, and the content of C and Si was considered to be C/Si = 3 based on the residual carbon ratio. The powder X-ray diffraction diagram of this solid was as shown in FIG.

In powder X-ray diffraction analysis, only a line with a width characteristic of amorphous carbon-based materials was broken, and no other diffraction lines were detected. This shows that the solid is an amorphous solid containing Si, O, and 0. Further, this was heated to 1600° under an argon atmosphere at a heating rate of 30°C/min and held for 4 hours to obtain β-8iO powder. The properties of the powder were as follows.

True specific gravity 3. '19~3.21 f/CI" Crystal form Cubic crystal (3C) single phase average particle size 0.15-→-H=μm Impurity At O,03% by weight Fe O,03tT G O,51 Color yellow The powder xIIIj! Diffraction diagram of the powder is shown in Figure 2.
The powder shape was as shown in Figure 3. It can be seen from FIG. 2 that it is β-type SiC that does not contain α-phase SiG such as 2H, and from FIG. 3 that it is a fine powder with a uniform particle size.

Comparative example 1. (Example 4 of JP-A No. 57-88019) A water glass No. 3 diluted aqueous solution (concentration: 8% for 5 in 2 minutes) was desodium-removed in a column packed with cation exchange resin Amberly 2000 (H+ type). Acid solution (
Concentration: 5102 min (5% by weight) 1 to 2 parts of dextran aqueous solution
02 (dextran-containing 42) was added.

Mixed and spray dried. The obtained white powder was heated at 1440° C. for 14 hours in a helium atmosphere to obtain 5i(3 powder).

The obtained SiC powder was SiG with a particle size of 061 to 0.2 μ, a crystal phase of 309Q%, and 2H2O%.

As is clear from the Examples and Comparative Examples, the method of the present invention yields a highly pure single-phase β-type SiO powder, whereas the method of the Comparative Example contains 2H α-phase SiG in the crystal phase.
It will be a mixture of. This 2H α-phase SiO is easily transformed at high temperatures, promotes grain growth during sintering, and inhibits densification.

The reason why 2H α-phase SiG is not mixed in the method of the present invention is considered to be that molecularly homogeneous mixing is achieved through polymerization or crosslinking reaction.

Example 2 A liquid silicic acid compound was obtained by dealkalizing and extracting water glass (silicic acid No. 4) with hydrochloric acid and tetrahydrofuran by a known method. This, a resol type phenol resin, and an acid catalyst were dissolved in the presence of alcohol, and heated to solidify. The mixing ratio of liquid metal silicate and phenolic resin is 4.
The weight ratio is 7153. The obtained resinous solid was prepared in Example 1.
The solid obtained after the 1000°C treatment was heated to 1000″C in the same manner as above and further heat-treated at 1600°C.
It was a homogeneous amorphous substance composed of Q and O, and was O/Si Yu3.

The β-8iO powder obtained after the 1600°C treatment was a fine powder, and the powder X-ray diffraction and powder shape were the same as in Example 1. The properties of the powder were as follows.

True specific gravity 3.19-3.21? /cm3 Crystal form Cubic (3C) single-phase grain Diameter 0.15-0.20 μm Impurities A4 Q, 04% by weight Fe O, 02# Na O, 12l G O, 6' Color Yellow Example 3゜Water glass (Silic acid No. 4) was extracted with hydrochloric acid and tetrahydrofuran, and trimethylsilylated by a known method to obtain a liquid silicic acid compound. This, a resol type phenolic resin, and an acid catalyst were dissolved and cured to form a homogeneous solid. The mixing weight ratio of liquid silicic acid compound and phenolic resin is 5
It is 4/46.

Thereafter, the same heat treatment as in Example 1.2 was performed. The obtained powder was a single-phase β-8iO fine powder. In this example, since an excessive amount of phenolic resin as a carbon source was added, the generated β
-3iC powder contained about 3% free carbon. 5i(l
Since it is necessary to add carbon to the sintering of the powder, it is effective for the powder to contain free carbon. The properties of the powder were as follows.

True specific gravity 3.19-3.20 f//cm' Crystal form Cubic (3C) single phase grain Diameter 0.15-0.20 μm Impurity AI 0.03% by weight Fe O, 02x Na O, 10# Free Carbon 3.0% by weight As described above, according to the method of the present invention, 2H α phase 5i
A uniform fine powder of β-type SiC without any mixture of Ci can be easily obtained. Therefore, this sintered body has no grain growth during sintering, and
It has the effect of becoming denser.

[Brief explanation of drawings]

Figure 1 shows the powder X-ray diffraction pattern (amorphous) of the SiO precursor material treated at 1000°C used in the method of the present invention;
Figure 2 is a powder X-ray diffraction pattern of β-type SiC powder produced by the method of the present invention (β-type SiC single-phase), and Figure 3 is an SEM photograph of β-type SiC powder produced by the method of the present invention. It is. Patent Applicant: Yu Goto, Director, Institute of Inorganic Materials, Science and Technology Agency (1 μm, 1,000 corrections ψ) Month 22, 1930 [J] Incident indication: Showa γ/Year patent application No.: ≠ γ 2 Name of the invention: 3. Relationship between the person making the amendment and the matter Patent applicant name Sheep 1 Science and Technology Agency Inorganic Agricultural Research Institute IU.
, "14 Supplement, iE instruction] 1 4 Self... q 佀wa °1 斗'/nzu (tsu 5 Specification subject to amendment Document 1, Name of the invention Process for producing β-type silicon carbide 2, Patent Claim 1: In producing silicon carbide by heating a raw material containing silicon and carbon in a non-oxidizing atmosphere, as a raw material,
Si obtained by uniformly dissolving a liquid silicon compound, a liquid organic compound having a functional group and generating carbon upon heating, and a polymerization or crosslinking agent, and then subjecting the mixture to a polymerization or crosslinking reaction.
, O, and C. 2. The method for producing β-type silicon carbide according to claim 1, wherein the liquid silicon compound is obtained by acid decomposition or dealkalization of an aqueous alkali silicate solution. 3. The method for producing β-type silicon carbide according to claim 1, wherein the liquid silicon compound is an ester of an organic compound having a hydroxyl group and silicic acid. 4. The method for producing β-type silicon carbide according to claim 1, wherein the liquid silicon compound is an ester obtained by reacting a hydrolyzable silicon compound with an organic compound or an organometallic compound. 5. The method for producing β-type silicon carbide according to claim 1, wherein the polymerization or crosslinking reaction is catalyzed by an organic compound having a functional group and generating carbon upon heating. 6. The β-type silicon carbide according to claim 1, wherein the polymerization or crosslinking reaction is a catalytic polymerization or crosslinking reaction of a liquid silicon compound and an organic compound having a functional group and producing carbon upon heating. Production method. 3. Detailed Description of the Invention The present invention relates to a method for producing silicon carbide (hereinafter referred to as SiC). More specifically, the present invention relates to a method for producing fine, 3C (β) single-phase, easily sinterable β-type SiC powder. SiC sintered bodies have high hardness and strength, excellent heat resistance, and are chemically stable, so they are widely used in wear-resistant mechanical parts, structural materials, heat-resistant materials, etc. SiC powder has α and β There are two crystal forms of
Conventionally, as a manufacturing method of iC powder, (1) 5ift
(2) Reaction of Si & C, T3) Gas phase synthesis method from Si compound and hydrocarbon are known, but it is industrially produced by the method (1) above. This is due to one of the following reactions at high temperatures. Since the reaction (2) above is a non-uniform solid-gas reaction, it is difficult to obtain a homogeneous powder with a uniform particle size (also, it is difficult to obtain a powder with a uniform particle size).
A small amount of iC (a-3iC) promotes grain growth during sintering and is harmful to densification. Therefore, the reaction (1) above is used; In order to promote this process, it is necessary to uniformly mix SiQ and C, and various methods have been proposed for this mixing method. A method of processing carbonaceous powder or a carbon precursor material using a method, that is, a method of producing SiC by mixing in a liquid phase to obtain a homogeneous mixture and heating this mixture in a non-oxidizing atmosphere (especially Kaisho 50-88
No. 019) is known. However, according to this method, although a physically homogeneous product is obtained, silica sol is generated and molecularly non-uniform, and when producing SiC, 2H α-
There was a problem in that several percent or more of the 8iC phase was mixed, making it impossible to obtain single-phase β-type SiC. The present invention has been made to solve this problem, and its purpose is to provide a method for producing single-phase β-type SiC using raw materials that are molecularly uniformly mixed. They achieved the above objective by using a liquid silicon compound and a liquid organic compound as a carbon source that has a functional group and generates carbon when heated, and after uniformly dissolving this mixture and the catalyst. , is cured by polymerization or crosslinking reaction to form a SiC precursor material containing a molecularly uniform mixture of Si, 0, and C, and when used as a raw material, single-phase β-type SiC can be obtained. The present invention was completed based on this finding.That is, the gist of the present invention is to produce silicon carbide by heating raw materials containing silicon and carbon in a non-oxidizing atmosphere, using liquid silicon as a raw material. After uniformly dissolving an elementary compound, a liquid organic compound having a functional group and generating carbon upon heating, and a polymerization or crosslinking catalyst, a precursor substance containing Si, O, and C obtained by a polymerization or crosslinking reaction is used. The present invention provides a method for producing β-type silicon carbide. Examples of the liquid silicon compound used in the present invention include (1) one obtained by acid decomposition or dealkalization of an aqueous alkali silicate solution; For example, silicic acid polymers obtained by dealkalization of water glass, (2) esters of silicic acid and organic compounds with OH groups, the following group of polymers obtained by trimethylsilylation of silicic acid polymers, (3) hydrated Examples include esters of decomposable silicic acid compounds and organic compounds or organometallic compounds, such as ethyl silicate.As a carbon source, liquid organic compounds that have a functional group and generate carbon when heated, especially those with a low residual carbon content. Preferred are organic compounds that polymerize or crosslink with catalysts or heat, such as phenol resins, furan resins, polyimides, polyurethanes, polyacrylonitrile, polyvinyl alcohol, polyvinyl acetate, and other resins such as cellulose, sucrose, pitch, tar, etc. The liquid organic compound having a functional group and a polymerization or crosslinking catalyst is dissolved in the liquid silicon compound, and a polymerization or crosslinking reaction is performed by heating to obtain a solid.Polymerization, Alternatively, the crosslinking reaction is carried out between (1) the functional group of an organic compound having a functional group and a liquid silicon compound, and (2) the functional group of a liquid organic compound having a functional group.For example, the polymerization of phenol Reaction (2) Reaction H between the silanol group in the silicic acid polymer and the methylol group of the organic compound The catalyst may be selected from catalysts used in polymerization or crosslinking reactions (for example, minerals such as hydrochloric acid, sulfuric acid, and oxalic acid). Examples include acids, alkalis such as sodium ethylate, organic peroxides, and organic sulfonic acids. The mixing ratio of the liquid silicon compound and the liquid organic compound having a functional group is such that the atomic ratio of C and St is 1 and C/Si<10, calculated by the amount of residual carbon in the organic compound at 800 to 1400°C.
, preferably every 3 C/St. When C remains +1 in the synthesized precursor material, C/
Let Si>3. A polymerization or crosslinking catalyst was mixed with the mixture in the above ratio, and the cured mixture was heated to a temperature of 600 to 100% in an inert gas atmosphere.
When treated at 00°C, a homogeneous non-article containing Si, O, and C is obtained. SiC is obtained by heat-treating this non-article at 1400 to 2000° C. in a non-oxidizing atmosphere, such as vacuum, nitrogen, helium, or argon. The heat treatment temperature is 1
The temperature is preferably around 600°C, and if it is lower than 1400°C, the reaction is slow, and since there is no need for a temperature higher than 2000°C, such a temperature is economically disadvantageous. The obtained SiC powder has a fine and uniform particle size distribution, and as a result of X-ray analysis, it was found that pure β-type SiC powder containing no α phase such as 2H and no β-3C carbon was obtained, and it was decarburized and purified. does not require. Example 1 Ethyl silicate containing 41% by weight of 5ins was used as a liquid silicon compound, and a resol type phenol resin with a residual carbon content of 4096 was used as a liquid organic compound having a functional group. 62% by weight of ethyl silicate and 38% of the phenolic resin
The weight percent mixture was cured under acid catalyst to obtain a transparent resinous solid. This was heated at a rate of 10°C/m under a nitrogen atmosphere.
Heated to 1000 in. □ The obtained solid is a homogeneous and dense solid, and the C and St content is C/5 from the residual carbon percentage.
It is considered that i=3. The powder X-ray diffraction diagram of this solid was as shown in FIG. In powder X-ray diffraction analysis, only a line with a width characteristic of amorphous carbon-based materials appeared, and no other diffraction lines were detected. From this, the solid contained Si, O and C, and was retained between four layers to obtain β-3iC powder. The properties of the powder were as follows. True specific gravity 3.19-3.21 g/cf Crystal form Cubic (3C) single phase average particle size 0.15 μm Impurity AA! 0.03% by weight Fe O,03〃 C0,5〃 Color Yellow The powder X-ray diffraction diagram of the powder was as shown in Figure 2, and the powder shape was as shown in Figure 3. From Figure 2, α-phase Si such as 2H
It can be seen from FIG. 3 that it is β-type SiC that does not contain C, and that it is a fine powder with a uniform particle size. Comparative example 1. (Example 4 of JP-A No. 57-88019) was mixed in a column filled with cation exchange resin Amberlite 200C (H'+ type) until sodium removal was performed,
Spray dried. The obtained white powder was heated at 1440° C. for 14 hours in a helium atmosphere to obtain SiC powder. The obtained SiC powder was SiC with a particle size of 0.1 to 0.2 μ, a crystal phase of 3C 90%, and 2H1096. As is clear from the Examples and Comparative Examples, the method of the present invention yields high-purity β-phase SiC powder, whereas the method of the Comparative Example contains 2H α-phase Si in the crystal phase.
It becomes a mixture of C. This 2H α-phase SiC is easily transformed at high temperatures, promotes grain growth during sintering, and inhibits densification. The reason why 2H α-phase SiC is not mixed in the method of the present invention is considered to be because molecularly homogeneous mixing is achieved by polymerization or crosslinking reaction. Example 2 Water glass (silicic acid No. 4) was dealkalized and extracted using hydrochloric acid and tetrahydrofuran by a known method to obtain a liquid silicic acid compound. This, a resol type phenol resin, and an acid catalyst were dissolved in the presence of alcohol, and heated to solidify. The mixing ratio of liquid silicic acid compound and phenol resin is 47153 weight ratio. The obtained resinous solid was heated to 1000°C in the same manner as in Example 1, and further heat-treated at 1600°C. The solid obtained after treatment at 1000°C is Si
, was homogeneous amorphous consisting of C and O and C/Si on 3. The β-3jC powder obtained after the 1600°C treatment is a fine powder, and the powder X-ray diffraction and powder shape are the same as in Example 1. The properties of the powder were as follows. True specific gravity 3.19-3.21 g/c, 111 crystals
Shape Cubic (3C) single-phase grain Diameter 0.15-0.20 ttm Impurities 7vO, 04% by weight Fe O, 02” Na O, 12〃 C0,6〃 Color Yellow Example 3゜Water glass (silicic acid 4 No.) was extracted with hydrochloric acid and tetrahydrofuran, and trimethylsilylated by a known method to obtain a liquid silicic acid compound.This was dissolved with a resol type phenol resin and an acid catalyst and hardened to form a homogeneous solid.Liquid silicic acid The mixing weight ratio of the compound and phenolic resin is 5
It is 4/46. Thereafter, the same heat treatment as in Example 1.2 was performed. The obtained powder was a single-phase β-3iC fine powder. In this example, since the phenolic resin serving as the carbon source was added in excess, the resulting β-3iC powdered rice contained about 396 free carbons. Since it is necessary to add carbon to sinter SiC powder, the inclusion of free carbon in the powder is effective for sintering. The properties of the powder were as follows. True specific gravity 319-3.20 g/ca Crystal shape Cubic (3C) single-phase grain Diameter 0.15-0.20 μm Impurities Al 0.03 weight N96 Fe O,02〃 Free carbon 3.0% by weight or more According to the method of the present invention, 2H α-phase Si
A uniform fine powder of β-type SiC without C mixed therein can be easily obtained. Therefore, this sintered body has the effect of causing no grain growth (and becoming denser) during sintering. Powder X-ray diffraction pattern (amorphous),
Fig. 2 is a powder X-ray diffraction pattern of β-type SiC powder produced by the method of the present invention (β-type SiC single-phase), and Fig. 3 is a powder X-ray diffraction pattern of β-type SiC powder produced by the method of the present invention. Masaru Gofuji, Director, Institute for Inorganic Materials, Science and Technology Agency

Claims (1)

[Claims] 1. In producing silicon carbide by heating a raw material containing silicon and carbon in a non-oxidizing atmosphere, the raw material is a liquid silicon compound, the functional group of which has been broken down. The liquid organic compound that generates carbon by heating and the polymerization material are characterized by the use of a precursor substance containing Sl, 0, and C obtained by uniformly dissolving a crosslinking catalyst and polymerizing or crosslinking it. A method for producing β-harisilicon carbide. 2. The method for producing β-type silicon carbide according to claim 1, wherein the liquid silicon compound is not obtained by acid decomposition or dealkalization of an aqueous alkali silicate solution. 3. The method for producing β-type silicon carbide according to claim 1, wherein the liquid silicon compound is an ester of silicon with an organic compound having a hydroxyl group. 4. The method for producing β-type silicon carbide according to claim 1, wherein the liquid silicon compound is an ester obtained by reacting a hydrolyzable silicon compound with an organic compound or an organometallic compound. 5. The method for producing β-type silicon carbide according to claim 1, wherein the polymerization or crosslinking reaction is a polymerization reaction or crosslinking reaction catalyzed by an organic compound having a government-funded group and producing carbon upon heating. 6. Production of β-type silicon carbide according to claim 1, wherein the polymerization or crosslinking reaction is a catalytic polymerization or crosslinking reaction of a liquid silicon compound and an organic compound having a functional group and generating carbon upon heating. Method.