A Study on the Bond Strength of Plasma Sprayed WC-12% Co Coating

플라즈마 용사된 WC-12%Co 피복층의 접합강도에 관한 연구

  • ;
  • ;
  • Chr
  • 이의길 (대전산업대학 금속공학과) ;
  • 김한삼 (인하공업전문대 금속과) ;
  • Published : 2000.10.01

Abstract

The development of new spraying processes has increased the demand for high quality protective coatings. Many thermal spraying processes have been developed to obtain coatings for a wide spectrum of materials and substrates. The plasma spray process was used to deposit coatings of WC-12%Co powders on mild steel substrate, and the characteristics of as-sprayed and vacuum heat treated coatings have been investigated. The variations of microhardness and bond strength in WC-12%Co coatings after heat treatment under vacuum circumstance have been investigated. The effects of phases and morphologies of WC-12%Co coatings have been investigated by utilizing X-ray diffraction and scanning electron microscopy, respectively. The microhardness and bond strength of the coatings were increased with increasing the temperature in the temperature range of $700^{circ}C~1000^{\circ}C$. The bond strength was obtained 49 MPa after vacuum heat treatment at $1000^{\circ}C$.

Keywords

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