Structure of Plasma-sprayed ZrO₂/（Ni/AI）Interface

Zhengyi LIU Hancun CHEN Yuzhi CHUANG (Y.C.Chuang) South China University of Technology,Guangzhou,510641,China

摘 要：<正> The structures of plasma-sprayed ZrO₂/（Ni/AI） interface before and after hot isostatic pressing（HIP） treatment were studied by TEM,ED and X-ray diffraction analysis.Plasma-sprayedZrO₂/（Ni/AI） interfacial region is of definite thickness and consists of multi-phase structures.Amorphous ZrO₂ sublayer,amorphous plus microcrystalline ZrO₂ sublayer and NiO were found inthe interface.NiO phase formed by the reaction between ceramic coating and metallic substrate inlocal regions.However.the thickness and amount of NiO trended to increase and the distribution ofNiO particles trended continuously when the coating was subjected to HIP treatment.HIP treatmentcan accelerate the diffusion of atoms in the interfacial region.

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