粒子分散モデルによる傾斜組成遮熱コーティングの熱応力解析

概要

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This paper presents an analytical method of thermal stresses in ZrO_2-8%Y_2O_3/MCrAlY graded thermal barrier coatings produced by plasma spraying. The formation of sprayed particles in graded coatings is investigated in order to construct the analytical model. The model is characterized by random dispersion of particles which have each physical properties in graded coatings. The validity of this methodology is investigated by comparison with more detailed stress analysis on a simple pattern with MCrAlY particle in ZrO_2 matrix. This analytical method is applied to graded thermal barrier coatings on gas turbine blades to determine the thermal stresses. Meanwhile the vertical crack in the 100% ZrO_2 top coat of the coating surface layer and the delamination in the ZrO_2 rich area of ZrO_2/MCrAlY graded layer in graded coating specimens are generated in heat cycle tests. The relationship of thermal stresses to these fractures in graded coatings is discussed.
社団法人日本機械学会の論文
1996-10-25