Method for synergistically improving performance of C/SiC composite material by adding multiple rare earth oxides

Abstract

A method for synergistically improving the performance of a C / SiC composite material by adding multiple rare earth oxides comprises the following steps: adding cerium oxide, SiC fine powder, lanthanum oxide fine powder and butyronitrile modified phenolic resin into absolute ethyl alcohol and acetone, uniformly stirring for fully dissolving, and then adding hexamethylenetetramine to obtain dipping slurry; t300 type carbon fibers are soaked in the soaking slurry, wound and air-dried, the T300 type carbon fibers are cut into square shapes, and the T300 type carbon fibers are stacked layer by layer and subjected to mold pressing to form the carbon fiber reinforced phenolic resin composite material; carrying out high-temperature pyrolysis on the carbon fiber reinforced phenolic resin composite material through inert gas; and performing high-temperature vacuum capillary Si infiltration treatment through an RMI process to obtain the carbon fiber reinforced ceramic matrix composite material. According to the method, when Si is infiltrated in the RMI process, rare earth lanthanum oxide fine powder plays a role in infiltrating catalysis, rare earth cerium oxide fine powder is added into the dipping slurry, the density of a finished product is improved, the porosity is reduced, the flow stress of the material is improved, and the high-temperature-resistant strength and the heat dissipation rate of the composite material are enhanced.

Description

Technical field [0001] The present invention relates to a method of adding a variety of rare earth oxides to improve the performance of C / SiC composites. Background technique [0002] Carote composite materials are a new type of composite composite in recent years. It has low density, high strength, high temperature resistance, wear resistant, anti-oxidation, and stable coefficient of friction. The braking is large, and the resistance is good. Long, large modulus, small expansion coefficient, stable dry and wet friction coefficient, no thermal recession and water recession. It has been used in aircraft, high-speed trains, and some high-end sports cars. However, the composite material is a composite material of a functionally integrated composite, a choice of carbon fiber type, a precursor treatment process, a ceramicization process, and a different amount of filler will affect the thermophysical, friction and mechanical properties of the finished product. At present, there is a...

AI Technical Summary

Problems solved by technology

Aiming at the method of preparing C / SiC composite materials by reaction melt infiltration (RMI), this method has short reaction time, low cost, and small porosity, but when infiltrating Si, due to porous C / C prefabrication The pores in the body are extremely small, and there may be a phenomenon that the Si liquid cannot penetrate smoothly and quickly, or there are some blind holes, resulting in the inability of the Si liquid to penetrate. There are many pores in the finished product, which will affect the heat dissipation performance of the finished product. After friction under load, the surface heats up extremely high, which affects friction stability