Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Wear Property of HVOF WC-CoCr Coating Manufactured by Optimal Coating Process

최적 고속화염용사코팅 공정기술에 의하여 제조된 WC-CoCr 코팅의 마모 특성

  • Song, Ki O (School of Nano Advanced Materials Engineering, Changwon National Univ.) ;
  • Cho, Tong Yul (School of Nano Advanced Materials Engineering, Changwon National Univ.) ;
  • Yoon, Jae Hong (School of Nano Advanced Materials Engineering, Changwon National Univ.) ;
  • Fang, W. (School of Nano Advanced Materials Engineering, Changwon National Univ.) ;
  • Youn, Seok Jo (Sermatech Korea Co., LTD) ;
  • Youn, Kuk Tae (Daegu Machinery Institute of Components & Materials) ;
  • Suh, Chang Hee (Daegu Machinery Institute of Components & Materials) ;
  • Hwang, Soon Young (Mater. & Processes Research Center, Research Institute of Industrial Science & Technology) ;
  • Ha, Sung Sik (Han Kook Steel & Mill Co., LTD)
  • Received : 2007.12.01
  • Published : 2008.06.22
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Abstract

Thermally sprayed tungsten carbide-based powder coatings are being widely used for a variety of wear resistance applications. The coating deposited by high velocity processes such as high velocity oxy-fuel (HVOF) thermal spraying is known to provide improved wear resistant property. In this study, optimal coating process (OCP) is obtained by the study of coating properties such as surface hardness, porosity, surface roughness and microstructure of 9 coatings prepared by Taguchi program for 3 levels of four spray parameters. The Friction and wear behaviors of HVOF WC-CoCr coating prepared by OCP, electrolytic hard chrome (EHC) plating and Inconel718 (In718) are investigated by reciprocating sliding wear test at $25^{\circ}C$, $450^{\circ}C$. Friction coefficients (FC) of all of the 3 samples are decreased as increasing sliding surface temperature from $25^{\circ}C$ to $450^{\circ}C$. FC of WC-CoCr decreases as increasing the surface temperature from $0.33{\pm}0.02$ at $25^{\circ}C$ to $0.26{\pm}0.02$ at $450^{\circ}C$, showing the lowest FC among the 3 samples. Wear trace (WT) and wear depth (WD) of WC-CoCr are smaller than those of EHC and In718 both at $25^{\circ}C$ and $450^{\circ}C$. These show that WC-CoCr is highly recommendable for protective coating on In718 and other metal components.

Keywords

Acknowledgement

Supported by : 산업자원부

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