Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Vacuum Heat Treatment on the Properties in Thermal Sprayed Ceramics Coating

세라믹스 용사 코팅 특성에 미치는 진공열처리의 영향

  • Lee, J.I. (Department of Materials Science and Engineering, Chungju National University) ;
  • Ur, S.C. (Department of Materials Science and Engineering, Chungju National University) ;
  • Lee, Y.G. (Department of Materials Science and Engineering, Chungju National University)
  • Received : 1999.12.23
  • Published : 2000.03.30
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Abstract

The effect of vacuum heat treatment in the thermal sprayed ceramics coating on a capstan by either high velocity oxygen fuel(HVOF) or plasma thermal spray process was investigated. The coating materials applied on the capstan were tungsten and chrome carbides. In order to characterize the interface between coating layer and bare materials, hardness, adhesion strength, X-ray diffraction(XRD) and microstructural analysis are conducted. The adhesion strength of the carbide coated materials by HVOF process is over 500MPa compared to those of plasma coating process is 230MPa. In case of the carbide coated materials by HVOF process, the adhesion strength is increased to 15MPa and the porosity is reduced under 5% by vacuum heat treatment for 5 hrs at $1000^{\circ}C$. The XRD results reveal that the increasement is believed due to the phase stabilization of metastable $Cr_3C_2$ phase to stable $Cr_{23}C_6$ phase.

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