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MICROSTRUCTURE AND OXIDATION RESISTANCE OFNiCoCrAlYTaCOATING BY LOW PRESSURE PLASMA SPRAYING

Author

Listed:
  • 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

TheNiCoCrAlYTacoating was prepared onNi-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 ofNiCoCrAlYTacoatings, which consists ofγ-Ni,β-NiAl,γ'-Ni3Al, andCrCoTaphases, is much homogeneous. The composition changes with depth from the surface to substrate for the coatings. The micro-hardness of coatings is 350.8 HV0.3and fracture toughness is 2.73 MPa m1/2. The oxidation resistance of coatings excelled thanNi-based single crystal super-alloys.

Suggested Citation

  • X.-H. Liang & K. S. Zhou & M. Liu & R. J. Hong & C. G. Deng & S. Luo & Z. K. Chen, 2009. "MICROSTRUCTURE AND OXIDATION RESISTANCE OFNiCoCrAlYTaCOATING BY LOW PRESSURE PLASMA SPRAYING," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 16(03), pages 375-380.
    • Handle: RePEc:wsi:srlxxx:v:16:y:2009:i:03:n:s0218625x09012743
    DOI: 10.1142/S0218625X09012743
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