METHOD FOR IMPROVING PEELING RESISTANCE OF THERMAL INSULATION COATING LAYER ON SURFACE OF METALLIC SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To improve the peeling resistance of a thermal insulation coating layer. SOLUTION: The surface of a metallic substrate 1 is thermally sprayed with a bonding layer 2 of MCrAlY (M: Ni, Co, Fe or the alloy thereof), and the surface is applied with sprayed coating 3 of zirconia. This zirconia sprayed coating 3 is irradiated with a laser beam 6 while it is reflected by an oscillator mirror 9 and is oscillated. Laser output in accordance with the size of the sprayed coating 3 and the working rate by moving a working table 10 are decided, by which laser irradiating treatment is executed. The peeling resistance of a thermal insulation coating layer 4 can be improved in the case the layer irradiating treatment is executed, compared to the case in which it is not executed.