Patent ID: 6123998
Filing Date: 2000-09-26
Classification: C23C

Abstract:
A ceramic coating method for coating a ceramic on a metallic substrate comprising the steps of:coating a ceramic material on a surface of the metallic substrate by continuously changing a composition of a ceramic material and a metal to form a ceramic coated film of a ceramic oxides wherein said metallic substrate is formed of a heat resistant alloy of an element selected from the group consisting of Fe, Co and Ni; and wherein said metallic substrate has a larger coefficient of linear expansion in comparison with that of the ceramic oxide; andsubsequently heat treating the ceramic coated metallic substrate at a temperature higher than a softening point of the metal so as to induce a residual stress due to compression on a surface of the ceramic coating film at a time of cooling the ceramic coated metallic substrate, thereby improving a durability of the ceramic coating film.