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A kind of silicon carbide reinforced carbon-based composite material and its preparation method

A carbon-based composite material and silicon carbide technology, which is applied in the field of composite material preparation, can solve the problems of poor oxidation resistance and ablation resistance, low mechanical properties, etc., and achieve the effects of reducing sintering temperature and enhancing mechanical strength.

Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a silicon carbide reinforced carbon-based composite material and a preparation method thereof. The problem of poor oxidation and ablation resistance

Method used

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  • A kind of silicon carbide reinforced carbon-based composite material and its preparation method
  • A kind of silicon carbide reinforced carbon-based composite material and its preparation method
  • A kind of silicon carbide reinforced carbon-based composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035]Weigh silicon powder and mesophase carbon microspheres with a molar ratio of 1:50 as the raw material powder, and take 4:1 sodium chloride and sodium fluoride as the medium, according to the mass ratio of the raw material powder and the medium as 1:4, the powder Mechanically stir in an agate mortar for 20 min to mix well. Put the mixed powder into an alumina crucible, under vacuum or protective atmosphere, raise the temperature of the mixed powder to 600°C at a rate of 10°C / min, keep it warm for 30 minutes; then raise the temperature to 1100°C at a rate of 5°C / min , keep warm for 1 hour, rinse with hot water at 80-100°C for 50-70 times, and dry to obtain silicon carbide-coated mesophase carbon microsphere powder. Take part of the composite powder and put it into a graphite mold. The upper and lower indenters and the inner wall of the mold are pre-laid with a layer of graphite paper, which is pre-pressed and formed into a sample, and then the graphite mold is placed in t...

Embodiment 2

[0039] The process of this example is the same as that of Example 1, except that some process parameters are changed: the molar ratio of silicon powder and mesocarbon microspheres is 1:20, the mass ratio of raw material powder and medium is 1:12, and the sintering temperature is 1800°C .

[0040] The same performance test as in Example 1 is carried out on the sintered sample of this embodiment, and the results are as follows: the density reaches 2.78g / cm 3 , the relative density reaches 97.15%, and the apparent porosity is 1.78%. Form a three-dimensional network ceramic skeleton and image 3 Similar; microstructure and figure 2 Similar; the flexural strength of the composite material reaches 298MPa, and the thermal conductivity reaches 125W / (m·K).

Embodiment 3

[0042] The process of this embodiment is the same as that of Example 2, except that some process parameters are changed: the reaction temperature under vacuum atmosphere is 1400° C., the holding time is 10 h, and the pressure applied to the graphite mold during the sintering process is 60 MPa.

[0043] The same performance test as in Example 1 was carried out on the sintered sample of this embodiment, and the results are as follows: the density reaches 2.85g / cm3, the relative density reaches 97.99%, and the apparent porosity is 1.01%. Form a three-dimensional network ceramic skeleton and image 3 Similar; microstructure and figure 2 Similar; the flexural strength of the composite material is 311MPa, and the thermal conductivity reaches 163W / (m·K).

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Abstract

The invention discloses a silicon carbide reinforced carbon matrix composite material and a preparation method. Mesocarbon microbeads are adopted as the matrix, and silicon carbide ceramic is adoptedas the reinforcement phase and is evenly distributed among the carbon microbeads so as to form a three-dimensional network silicon carbide skeleton reinforced isotropic structure. Technically, siliconpowder particles and the mesocarbon microbeads are taken as the raw materials to prepare uniform and thickness controllable silicon carbide coating coated mesocarbon microbead powder by molten salt method, after pre-press molding, discharge plasma sintering is carried out at 1600-1900DEG C to form a uniform three-dimensional network silicon carbide ceramic skeleton, while the strength, ablation resistance, oxidation resistance and thermal shock resistance of the carbon matrix are improved, the thermal conductivity of the matrix is also improved, therefore the isotropic carbon matrix compositematerial characterized by low cost, low density and excellent mechanical properties, sintering properties, thermal shock resistance, ablation resistance and thermal conductivity can be formed. Because of the excellent comprehensive performance, the silicon carbide reinforced carbon matrix composite material can be widely applied to aerospace, national defense, electronic packaging and other fields, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a silicon carbide reinforced carbon-based composite material and a preparation method. Background technique [0002] Mesophase carbon microspheres are a new type of carbon-based functional material, which is a discotic nematic liquid crystal structure formed during the carbonization of polycyclic aromatic compounds. It has good chemical stability, high bulk density, easy carbonization, good thermal stability and other characteristics. At the same time, mesocarbon microspheres also have the advantages of low price and low density, and have broad application and development prospects. However, this isotropic carbon material is not easy to sinter and densify, and the sintering temperature is as high as about 3000 ° C. Low, easily oxidized at high temperature. [0003] Silicon carbide is a compound with strong covalent bonds, stable chemical prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/528C04B35/628C04B35/622C04B35/64
Inventor 史忠旗谢文琦张晓钰张哲健魏智磊葛邦治夏鸿雁
Owner XI AN JIAOTONG UNIV
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