Preparation of carbon fiber reinforced carbon-silicon carbide double matrix friction material

Abstract

The invention discloses a preparation method for a carbon fiber enhanced carbon-carborundum double-matrix abrasive material. Short chopped carbon fiber, graphite powder, industrial silicon powder and caking agent are employed to be pressed into the block material of carbon fiber enhanced graphite powder and silicon powder (C / C-Si) in a cooling way; then mechanical cracking and pelleting are carried out to the prepared C / C-Si block material; next, the grains are thermally pressed into a C / C-Si biscuit; and then the C / C-Si biscuit is carbonized to prepare a C / C-Si porous body; and finally non-dipping directional fused silica impregnating is carried out to the C / C-Si porous body to prepare the carbon fiber enhanced carbon-carborundum double-matrix (C / C-SiC) abrasive material. The invention relates to a preparation method for a carbon fiber enhanced carbon-carborundum double-matrix abrasive material having higher mechanical property and excellent abrasion resistance and wear performances, with the advantages of short preparation cycle, low cost, and being capable of engineering.

Description

technical field [0001] The invention relates to a preparation method of carbon fiber reinforced carbon-silicon carbide double-matrix (C / C-SiC) friction material, specifically a "warm pressure-carbonization-melting silicon impregnation" process, which can be used to prepare high-performance C / C-SiC friction material. Background technique [0002] Carbon fiber reinforced carbon-silicon carbide double matrix (C / C-SiC) composite material is a new generation of high-performance friction material developed at the end of the 20th century. It has a series of excellent properties such as low density, anti-oxidation, corrosion resistance, high and stable friction coefficient, small wear, large braking specific pressure, small volume of braking system and good thermal conductivity, etc., especially can overcome the static state of C / C braking materials. And the shortcomings of low friction coefficient in wet state can guarantee the braking safety of power machinery at high speed and h...

AI Technical Summary

Problems solved by technology

Chemical vapor infiltration is one of the most promising methods for preparing fiber-reinforced ceramic matrix composites. Its notable feature is that it can be prepared at a lower temperature, but the preparation of thick-walled parts is prone to "bottleneck" effects. A large density gradient is generated inside the material, and the process preparation cycle is long and the cost is high

The polycarbosilane conversion method does not require special equipment, and the process is relatively simple, but the amorphous matrix obtained by this method has poor material properties

The molten silicon impregnation method has a short preparation cycle and low cost, but the molten silicon is easy to react with the carbon fiber during the impregnation process and cause damage to it, resulting in low mechanical properties. Therefore, other methods are generally used to prepare the carbon fiber in the material after the protective layer Silicon carbide matrix was prepared by molten silicon impregnation method

The temperature-pressing-in-situ reaction method has a short preparation cycle and low cost, and the prepared C / C-SiC friction material has a high friction coefficient, but the material has low density, low mechanical properties, and poor toughness

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