ジルコニア溶射皮膜の密着性に与える残留ブラスト材の影響

抄録

The bonding mechanism of thermal sprayed ceramic coating was not clear due to the complicated profile of blasted surface and microstructure of the coating. The objective of this study is to investigate the influence of residual blast-material on the adhesive strength of yttria-stabilized zirconia coatings sprayed by atmospheric plasma spraying. Stainless steel was used as a substrate, and blasted in three different pressures and five different blast angles by fused alumina abrasives with three different particle sizes. Three powders with different particle sizes were used as spray materials. Our observation revealed that roughness of blasted substrate were constant in each blasting material independent of blast angle, though mass of residual blast-material increased with increasing the blasting pressure. Interestingly, the tensile adhesive strength increased with increasing the mass of residual blast-material in each spray materials under the condition of the same roughness. Tensile residual stress was high at near the interface, and the residual stress of acute blast angle was higher than that of right angle. It was convinced that the residual stress reduced the adhesive strength in the case of acute angle. Therefore, it was concluded that residual blast-material did not almost affect the adhesive tensile strength.