溶射プロセスに基づくセラミック溶射コーティングの残留応力解析

概要

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Residual stress is generated in ceramic spraying coatings, which were fabricated by a plasma spray technology, by difference of coefficient of thermal expansion between the coating and the substrate. From previous experimental results obtained by X-ray diffraction method and strain gage method, it is known that the residual stress at the ceramic coating surface is in tensile for as-spray one. In this study, the evaluation method that can predict exactly such residual stress is suggested based on an actual thermal spray process. Residual stress model proposed in this method is consisted of (1) quenching stress, which was formed in molten spray particles impinged onto the substrate, and (2) thermal stress, which was generated by difference of thermal expansion between the particle-deposited layer and the substrate. It was shown herein that residual stress estimated by the proposed model almost coincides with experimental one with a good accuracy.
社団法人日本機械学会の論文
2006-05-25