セラミックスコーティング材の熱AE試験と超音波探傷Cスコープによる初期欠陥検出

概要

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Non-destructive evaluations of initial damage and damage mechanism were conducted in plasma sprayed coating, ZrO_2-8 mass% Y_2O_3/NiCoCrAlY onto stainless steel by atmosphere plasma sprayed method by thermal acoustic emission(AE)method and ultrasonic C-scope. The materials was subjected to thermal shock cycle. Initial damage generation occurred on colony pores at the ceramic/bond layer interface, where delamination was generated by the coalescence of initial thermal stress damages following damage nucleation. The damage mechanism was cracking of the ceramic layers by thermal tensile stress. AE detected the initial defects and the damage, and damage mechanism in according to an analysis of AE location and amplitude with correspondence to thermal history. Ultrasonic C-scope evaluation provided a high resolution view for damage detection, combining the results of AE location.
社団法人日本セラミックス協会の論文
1999-01-01