Increasing high temperature oxidation and corrosion resistance of graphite and carbon-fiber-reinforced carbon by deposition of a low pressure chemically vapor-deposited silicon carbide coating

Abstract

This paper describes a process to protect graphite and carbon-fiber-reinforced carbon (CFRC) against high temperature oxidation and corrosion while maintaining thermal shock properties by a combination of infiltration and deposition into and/or onto the products' surface. Coating parameters and morphologies are discussed. Through research and continuing product development, it is possible to reduce greatly the rates of oxidation and corrosion of graphite or CFRC by the use of low pressure chemical vapor deposition of SiC and multilayer techniques. A β-SiC (111) coating alone or in combination with a multilayer treatment can be produced in large-scale reactors to achieve enhanced oxidation and corrosion resistance while not eliminating the thermal shock properties.