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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 7    No. 1    March 1997

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MICROSTRUCTURE OF NiCoCrAlY COMPONENT IN PLASMA SPRAYED ZrO_2/NiCoCrAlY GRADED COATING
Xiang Xinghua1; Zhu Jingchuan1; Yin Zhongda1 ; Lai Zhonghong2

1.School of Materials Science and Technology; Harbin Institute of Technology; Harbin 150001 ;
2.Center of Analysis and Test; Harbin Institute of Technology; Harbin 150001

Abstract:NiCoCrAlY alloy component in ZrO2/NiCoCrAlY graded coating forms heterogeneous microstructure after plasma spraying, which consists of γ (Ni) matrix phase and some ε Co phase, as well as a little γ′ (Ni3Al) phase. Moreover, owing to the impaction of molten NiCoCrAlY droplets on the substrate at high speed, the alloy particles experience severe deformation at a high strain rate, producing a lot of dislocations. During rapid solidification, NiCoCrAlY alloy reacts with oxygen in air, and some NiO, Cr2O3, Al2O3 form in the alloy.

 

Key words: plasma spraying graded coating NiCoCrAlY microstructure

ISSN 1672-7029
CN 43-1423/U

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