| 摘要 |
PROBLEM TO BE SOLVED: To obtain a member to be exposed to high temperature, which is free from degradation of high temperature strength attendant on deficiency of Ni and Cr due to diffusion of undercoat components, cracking and local breakage caused by thermal fatigue, reduction in adhesion of inner film, dissipation of a heat shielding action of topcoat and peeling of the topcoat and has prolonged service life. SOLUTION: An undercoat 2 of chromium carbide type cermet, composed essentially of Cr2C3 and having high thermal conductivity in addition to excellent adhesion and heat resistance, is applied by a thermal spraying process to the high-temperature-side surface of a base material 1 made of heat resistant alloy in which one side is forcedly cooled and the other side is exposed to high temperature. Further, a topcoat 4 of ZrO2 ceramics or MCrAlX alloy is formed on the above, by which a composite hot-melt-splay-coating is formed. |
