Oxidation resistance carbon fiber-reinforced graphite composite material

摘要

PROBLEM TO BE SOLVED: To improve the durability by forming a porous silicon carbide layer on the surface of a carbon fiber-reinforced carbon composite material, then covering it with a dense silicon carbide by a vapor chemical deposition method, and coating the outermost layer with the mixture of a high melting point metal silicide having a specific melting point or higher and silicon alloy having a specific melting point or lower. ;SOLUTION: A porous SiC layer 2 is formed on a C/C base material 1 made of carbon fiber-reinforced composite material by a diffusing method, and a dense SiC layer 3 is formed thereon by a CVD. A mixture coating layer of high melting point metal silicide 4 and silicon alloy 5 is provided on the outermost layer. As the silicide 4 having a melting point of 1700°C or higher, SiC, SiB₆, WSi₂, MoSi₂, ReMoSi₄ can be used, and particularly MoSi₂ is preferable. As the silicon alloy 5 having a melting point of 1400% or lower, the alloy of Si and one or more types of Al, Au, Sn can be used, and preferably Si-Al, Si-Au, or Si-Sn can be used.;COPYRIGHT: (C)1997,JPO