| 摘要 |
PROBLEM TO BE SOLVED: To obtain a dense nitride and carbide coating film having high corrosion resistance, high wear resistance and high hardness with a simple device and a simple means by coating the surface of a base material with an oxide soln., heating this coating film to convert into an oxide coating film and thereafter executing reduction nitrification and carbonization. SOLUTION: The oxide soln. to be used is composed of an oxide sol, and preferably, it is of peroxotitanic acid. This is applied to a base material by coating, immersion or the like, and after that, in the case heating is executed, an oxide coating film having an O-M-O-M skeleton is formed. M denotes metallic elements, preferably, of Ti, Zr and Hf as Ti group elements. This oxide coating film has characteristics of extremely easily capable of being nitrided and carbonized. The reduction nitrification can be executed in gaseous ammonia, in gaseous nitrogen or the like. Furthermore, the carbonization can be executed by firing in carbon powder or in gaseous CO. The concn. of oxide in the oxide soln. is regulated to 0.5 to 20.0 wt.%. |
