Method for preparing C/C-SiC composite material through reaction melt infiltration process by adding rare earth cerium oxide

Abstract

The invention relates to a method for preparing a C / C-SiC composite material through a reaction melt infiltration process by adding rare earth cerium oxide. The method comprises the following steps: preparing dipping slurry: adding silicon carbide and cerium oxide ball-milled fine powder into butyronitrile modified phenolic resin, stirring and mixing, pouring the mixed powder into absolute ethyl alcohol and acetone solvent, dissolving, adding hexamethylenetetramine to be blended into resin solution, and mixing to obtain the dipping slurry; dipping T300 type carbon fibers in the dipping slurry, winding, airing, cutting according to needs, stacking the T300 type carbon fibers layer by layer, and performing compression molding through a hot press to prepare a carbon fiber reinforced phenolic resin composite material; carrying out high-temperature pyrolysis on the carbon fiber reinforced phenolic resin composite material in an inert gas Ar atmosphere; and performing Si infiltration treatment through an RMI process to obtain the carbon fiber reinforced ceramic matrix composite material. According to the method, the compactness of a finished product can be greatly improved, the flow stress of the material is improved, dynamic recrystallization under the high strain condition is inhibited, the wear rate is reduced, and meanwhile the thermal decomposition performance of the binder is improved.

Description

technical field [0001] The invention relates to a method for preparing a C / C-SiC composite material by adding a rare earth cerium oxide reaction melt impregnation method. Background technique [0002] Carbon ceramic material is a new type of composite material developed in recent years. It has low density, high strength, high temperature resistance, wear resistance, oxidation resistance, stable friction coefficient, large braking ratio, good thermal shock resistance, and long service life. , large modulus of elasticity, small coefficient of expansion, stable friction coefficient in wet and dry state, no thermal recession and water recession. It has been used in airplanes, high-speed trains, and some high-end sports cars. However, the material is a composite material with integrated structure and function. The choice of carbon fiber type, the treatment process of the precursor, the ceramicization process and the difference in fillers will affect the thermophysical properties...

AI Technical Summary

Problems solved by technology

The current reaction melt impregnation method to prepare C / C-SiC composite materials has the advantages of short reaction time, low cost, and small porosity, but there are still some pores in the finished product, which will affect the heat dissipation performance of the finished product, and After long-term high-load friction, the surface temperature rises extremely high, which will affect the friction stability. High temperature causes thermal decomposition of the binder, increased wear rate and weak internal deformation