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Preparation method of C/C-SIC ceramic composite material

A technology of silicon carbide ceramics and composite materials, applied in ceramic products, applications, household appliances, etc., can solve the problems of restricting the engineering application of C/C-SiC composite materials, long preparation period, and high ceramic brittleness, and shorten the production. effect of cycle, density enhancement, and brittleness reduction

Active Publication Date: 2012-04-25
XIAN XINGUI CERAMIC COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of these two processes is that the preparation period is long (more than 3 months), which leads to high cost and seriously restricts the engineering application of C / C-SiC composite materials; moreover, the equipment required for the preparation process is complicated, so domestic and foreign Vigorously develop low-cost preparation technology of C / C-SiC composite materials
In addition, the existing continuous fiber-reinforced silicon carbide ceramic composites have low density, and the ceramics are brittle and easily damaged

Method used

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  • Preparation method of C/C-SIC ceramic composite material
  • Preparation method of C/C-SIC ceramic composite material
  • Preparation method of C/C-SIC ceramic composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Weigh the raw materials in the following proportions: 960 grams of phenolic resin, 120 grams of absolute ethanol, and 120 grams of acetone, then add 643 grams of micron-sized silicon carbide (SiC) powder, mix evenly by ball milling (conventional method), and use it as an impregnating slurry .

[0033] Produced according to the following process:

[0034] (1) Carbon coating: First, commercially available (thickness 6mm or 10mm) PAN-based flat carbon felt is used as a reinforcement, and the carbon coating is prepared by isothermal CVD process (conventional process in the industry). The deposition temperature is 900 ° C, -0.098 Under MPa vacuum conditions, use high-purity nitrogen with a flow rate of 20ml / min as the diluent gas and propylene with a flow rate of 200ml / min as the pyrolysis carbon gas source, and then under the protection of high-purity argon, the temperature rises to 1100°C for deposition. Obtaining a PAN-based flat carbon felt with a pyrolytic carbon coati...

Embodiment 2

[0044] Weigh the raw materials in the following proportions: 960 grams of phenolic resin, 120 grams of absolute ethanol and 120 grams of acetone, then add 982 grams of micron-sized silicon carbide (SiC) powder, and mix evenly by ball milling.

[0045] The preparation process is the same as in Example 1, and the product density is 2.52g / cm 3 ; The open porosity is 1.96%, and the three-point bending strength reaches 198MPa.

Embodiment 3

[0047] Weigh the raw materials in the following proportions: 960 grams of phenolic resin solution, 120 grams of anhydrous methanol and 120 grams of acetone, then add 514 grams of micron-sized silicon carbide (SiC) powder, and mix evenly by ball milling.

[0048] The preparation process is the same as in Example 1, and the product density is 2.45g / cm 3 ; The open porosity is 2.91%, and the three-point bending strength reaches 176MPa.

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Abstract

The invention discloses a preparation method of a C / C-SIC ceramic composite material, comprising the following steps: using a cheap low-density PAN-based flat carbon felt as a precursor, and preparing a protective layer on the surface of carbon fibers through chemical vapor deposition; preparing phenolic resin, acetone, ethanol and silicon carbide powder in proportion into a slurry, immersing the carbon felt with the protective layer in the slurry and vacuumizing, then pressing for impregnating; pressing the pre-impregnated carbon felt into shape, then carrying out solidification and carbonization; then putting the carbonized precursor in a furnace, carrying out high temperature siliconizing reaction and filling to obtain a compact base substrate, and then removing residual silicon from the surface to obtain the high-performance high-density C / C-SIC ceramic composite material having a density of 2.30-2.70 g / cm<3>. According to the invention, the preparation process is simple, the raw materials are cheap, the production time and procedures are greatly reduced. The invention can be suitable for batch production and is easy to industrialization.

Description

technical field [0001] The invention relates to the technical field of high-temperature structural ceramic-based composite materials, in particular to a low-cost carbon / carbon suitable for high-temperature and wear-resistant materials such as furnace bottom lining plates for heating furnaces, conductive slider materials for trams, and high-conductivity and wear-resistant materials. - Preparation method of silicon carbide (C / C-SiC) ceramic composite material. Background technique [0002] Silicon carbide ceramics have good high temperature strength, high temperature stability, high temperature oxidation resistance and electrical conductivity, but due to the strong covalent bond of its molecular structure, the brittleness of silicon carbide ceramics is large, which seriously affects its use as a structural material. application. Carbon fiber has good high-temperature mechanical properties and thermal stability, and can maintain mechanical properties without degradation in an ...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/565C04B38/06C04B35/622
Inventor 邬国平
Owner XIAN XINGUI CERAMIC COMPOSITE MATERIAL CO LTD
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