| REAEARCH PAPER |
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| Microstructure and Property of NiCoCrAlYTa Coatings Prepared by Different Thermal Spraying Technology |
| MAO Jie, DENG Chunming, WU Xiangbin, DENG Changguang, SONG Jinbing, LIU Min
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| The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510651 |
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Abstract To explore the influence of different thermal spraying processes on the microstructure and properties of NiCoCr-AlYTa coatings and determine the optimal parameters, the NiCoCrAlYTa coatings were obtained on the single crystal superalloy substrate by air-plasma spraying (APS), low-pressure plasma spraying (LPPS), high velocity oxygen-fuel spraying (HVOF) and low temperature high velocity oxygen fuel (LT-HVOF) methods. The phase compositions, microstructure and micro-hardness of all coa-tings were characterized by XRD, SEM and micro-hardness tester. The same phase composition of γ′-Ni3Al,β-NiAl and γ-Ni solid solution were proved in NiCoCrAlYTa coatings under different spraying methods. The coatings prepared by LPPS, HVOF (LT-HVOF inclued) are dense and of low porosity, among which the porosity of HVOF (LT-HVOF included) coating is less than 1%. Oxygen content is low in LPPS and LT-HVOF coatings, and which is controlled in the range of 0.3% to 0.6%. Generally, LT-HVOF process is the optimum choice for depositing NiCoCrAlYTa coating with dense structure, very low porosity and oxygen content.
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Published: 07 May 2018
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2017, Vol. 31 
