レーザー照射によるジルコニア溶射層の特性向上

概要

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The surface of the Y_2O_3 partially stabilized ZrO_2 thermal barrier coatings ( TBC) , which was formed about 300 μm thick by plasma spraying, was densified and flattened by laser processing. The laser processed TEC properties were evaluated and compared with those before laser processing. The results were as follows. Erosion resistance was improved threefold by the laser processing. More than sevenfold improvement in the TBC thermal fatigue life was expected by the laser processing. It was confirmed that hot corrosion resistance was improved by the laser processing. But, the laser processing reduced the TBC shear bond strength by 40%. The principal reasons for the TBC property improvements were confirmed to be the densification and flattening of the TBC surface by laser processing. As for the thermal fatigue life, the effect of cracks, which were induced during laser processing, was found to be important. These cracks caused shear strength reduction, but no bad influence of the cracks was observed for other TBC properties.
社団法人日本セラミックス協会の論文
1989-05-01