Structure of Plasma-sprayed ZrO_2/(Ni/AI)Interface

Abstract

Abstract: The structures of plasma-sprayed ZrO_2/(Ni/AI) interface before and after hot isostatic pressing (HIP) treatment were studied by TEM,ED and X-ray diffraction analysis.Plasma-sprayed ZrO_2/(Ni/AI) interfacial region is of definite thickness and consists of multi-phase structures. Amorphous ZrO_2 sublayer,amorphous plus microcrystalline ZrO_2 sublayer and NiO were found in the interface.NiO phase formed by the reaction between ceramic coating and metallic substrate in local regions.However.the thickness and amount of NiO trended to increase and the distribution of NiO particles trended continuously when the coating was subjected to HIP treatment.HIP treatment can accelerate the diffusion of atoms in the interfacial region.

Key words: plasma-spray, interface, Ni/Al, ZrO_2

Zhengyi LIU Hancun CHEN Yuzhi CHUANG (Y.C.Chuang) South China University of Technology,Guangzhou,510641,China. Structure of Plasma-sprayed ZrO_2/(Ni/AI)Interface[J]. J Mater Sci Technol, 1993, 9(5): 350-354.

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Structure of Plasma-sprayed ZrO_2/(Ni/AI)Interface

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