P-SC327-7 コーティングの界面・内部応力分布評価について

概要

論文の詳細を見る
A thermal barrier coating is multi-coating system made of a zirconia top coat and a NiCoCrAlY bond coat. To improve thermal barrier coatings, it is indispensable to measure residual stresses and oxidation of the bond coat through the top coat. Since a high energy X-ray has a large penetration depth, diffractions from the bond coat can be measured through the zirconia top coat. In this study, the diffraction profiles from the bond coat were measured through the top coat with the thickness of 0.1 mm by using 72 keV X-ray source. As a result, the 311 diffraction from Ni_3Al is useful for measuring residual stresses in the bond coat. The distribution of the residual stresses in the top coat and the bond coats were measured with Cr-Kα radiations. The residual stresses in the surface layer were released due to cracks, and residual stresses were about 50MPa below the depth of about 50μm. Near the boundary between the top coat and the bond coat, the residual stresses in the top coat increased, whereas the bond coat showed large compressive residual stresses. The compressive residual stresses decreased in the deep layer from the boundary.
社団法人日本機械学会の論文
2002-03-07