X.-H. LIANG () (Faculty of Materials and Energy, Guangdong University of Technology, Guangzhou, Guangdong, China) K. S. ZHOU (Institute of Surface Engineering, Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou, China) M. LIU (Institute of Surface Engineering, Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou, China) R. J. HONG (Institute of Surface Engineering, Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou, China) C. G. DENG (Institute of Surface Engineering, Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou, China) S. LUO (Institute of Surface Engineering, Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou, China) Z. K. CHEN (Institute of Surface Engineering, Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou, China)
Abstract
The NiCoCrAlYTa coating was prepared on Ni-based single crystal super-alloys by low pressure plasma spraying (LPPS). The phases and microstructures for the coatings were characterized by X-ray diffraction and scanning electron microscopy, and the fracture toughness and micro-hardness for both coatings and substrate were also investigated. The relationship between coating properties and oxidation was analyzed. The result shows that elementary distribution of NiCoCrAlYTa coatings, which consists of γ-Ni, β-NiAl, γ'-Ni3Al, and CrCoTa phases, is much homogeneous. The composition changes with depth from the surface to substrate for the coatings. The micro-hardness of coatings is 350.8 HV0.3 and fracture toughness is 2.73 MPa m1/2. The oxidation resistance of coatings excelled than Ni-based single crystal super-alloys.
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Article provided by World Scientific Publishing Co. Pte. Ltd. in its journal Surface Review and Letters.