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Method for preparing C/SiC composite material through low-cost fused silicon impregnation method

A composite material and infiltration technology, applied in the field of C/SiC composite material preparation, can solve the problems of long preparation period, prone to cracks in the matrix, high cost, and reduce the content of pores and free silicon, toughness and friction and wear. The effect of good performance, low porosity and free silicon content

Active Publication Date: 2013-10-09
山东宝纳新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hot pressing sintering method has complex equipment, low production efficiency and high cost
During the production process of the precursor conversion method, the matrix is ​​prone to cracks, the yield is very low, and the preparation cycle is long
The chemical vapor infiltration method has a long production cycle, high manufacturing cost, poor thermal stability of the obtained material, many residual pores, poor mechanical properties and oxidation resistance
In contrast, the reaction melt infiltration method has the advantages of short preparation cycle, low cost, and near-net shape, and has the most application prospect in industrial production. However, the reaction melt infiltration method also has its own technical difficulties, which may easily lead to carbon / Silicon carbide composites contain too much free silicon and deteriorate their performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Carbon felt pretreatment:

[0040] Set the bulk density to 95kg / m 3 The carbon felt was calcined at 500 °C for 60 min under a nitrogen atmosphere.

[0041] 2. Boron nitride coating treatment

[0042] Immerse the carbon felt pretreated in step 1 into an aqueous solution of melamine and boric acid with a molar concentration of 0.7mol / L, the molar ratio of melamine to boric acid used is 1:3, the temperature of the aqueous solution is 45°C, and the stirring speed is 50r / min, stirring Time 7min, drying;

[0043] 3. Carbon felt impregnated with carbon / silicon carbide slurry

[0044] Dip the carbon felt treated in step 2 into an aqueous solution of carbon / silicon carbide slurry with a solid content of 51wt%, stir and impregnate, impregnate for 15 minutes, and dry. In the carbon / silicon carbide slurry aqueous solution, there are 14 parts by mass of carbon black, and 83 parts by mass of silicon carbide ceramic micropowder, wherein the mass ratio of W10:W20 in the silicon ...

Embodiment 2

[0061] 1. Carbon felt pretreatment:

[0062] Set the bulk density to 110kg / m 3 The carbon felt was calcined at 500 °C for 60 min under a nitrogen atmosphere.

[0063] 2. Boron nitride coating treatment

[0064] Immerse the carbon felt pretreated in step 1 into an aqueous solution of melamine and boric acid with a molar concentration of 0.7mol / L, the molar ratio of melamine to boric acid used is 1:3, the temperature of the aqueous solution is 45°C, and the stirring speed is 50r / min, stirring Time 6min, drying;

[0065] 3. Carbon felt impregnated with carbon / silicon carbide slurry

[0066] Immerse the carbon felt treated in step 2 into a carbon / silicon carbide slurry with a solid content of 49wt% (10 parts by mass of carbon black, 88 parts by mass of silicon carbide ceramic micropowder, mass ratio of W10:W14 in silicon carbide ceramic micropowder: 5: 3) Agitate and infiltrate in the aqueous solution, first impregnate for 13 minutes, dry, second time for 1.5 minutes, dry agai...

Embodiment 3

[0084] 1. Carbon felt pretreatment: set the bulk density to 120kg / m 3 The graphite felt was calcined at 550°C for 60min under an argon protective atmosphere.

[0085] 2. Boron nitride coating treatment: immerse the graphite felt pretreated in step 1 into an aqueous solution of melamine and boric acid with a molar concentration of 0.7mol / L, the molar ratio of melamine to boric acid used is 1:3, and the temperature of the aqueous solution is 45 ℃, stirring speed 50r / min, stirring time 6min, drying;

[0086] 3. Graphite felt impregnated with carbon / silicon carbide slurry: immerse the graphite felt treated in step 2 into carbon / silicon carbide slurry with a solid content of 48wt% (8 parts by mass of carbon black, 89 parts by mass of silicon carbide ceramic micropowder, The mass ratio of W5:W10 in the silicon carbide ceramic micropowder is 3:2) and impregnated with stirring in the aqueous solution. The first impregnation is 12 minutes, and then dried. The second 1.5 minutes, and t...

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Abstract

The invention relates to a method for preparing a C / SiC composite material through a low-cost fused silicon impregnation method, which comprises the following steps: performing calcining pretreatment on a carbon felt or graphite felt at 400-600 temperature; immersing the pretreated carbon felt or graphite felt in a melamine and boric acid solution, thus coating a boron nitride protective layer; immersing in a carbon / silicon carbide slurry water solution, performing impregnation to ensure that pores of the carbon felt or graphite felt are fully filled with carbon / silicon carbide, placing in a sintering furnace, and performing primary fused silicon impregnation treatment at 1600-1800 DEG C; immersing in liquid phenolic resin, and performing carbonization treatment under the protection of an inert atmosphere at 800-1000 DEG C to ensure that all the resin is carbonized; and finally, performing secondary fused silicon impregnation treatment to ensure that carbon produced by carbonization of the resin totally reacts with silicon to generate silicon carbide, thus obtaining the C / SiC composite material. The obtained C / SiC composite material is high in density, low in air pore and free silicon content, and favorable in material strength, toughness and frictional wear performance, and can be used for manufacturing of brake pads.

Description

technical field [0001] The invention relates to a method for preparing a C / SiC composite material by a low-cost molten silicon impregnation method, and belongs to the technical field of C / SiC composite material preparation. Background technique [0002] C / SiC composite material is a new generation of high-performance composite material developed in recent years. It has low density, high strength, high toughness, good thermal shock resistance, good friction and wear resistance, corrosion resistance, oxidation resistance, high temperature resistance, With the advantages of strong environmental adaptability and small thermal expansion coefficient, it can be used as a high-temperature structural material, high-temperature thermal field heat insulation protection material, friction braking material for high-speed, high-energy vehicles and construction machinery in aerospace, transportation, energy, chemical and other fields. with broadly application foreground. [0003] Chinese ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/83C04B35/565C04B35/622F16D69/02
Inventor 张玉军李兆敏李其松孙海滨车效华李学明刘欢
Owner 山东宝纳新材料有限公司
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