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Vol.46, No.6, 351 ~ 357, 2008
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| Title |
| Wear Property of HVOF WC-CoCr Coating Manufactured by Optimal Coating Process |
| 송기오 Ki O Song , 조동율 Tong Yul Cho , 윤재홍 Jae Hong Yoon , 방위 W. Fang , 윤석조 Seok Jo Youn , 윤국태 Chang Hee Suh , 서창희 Kuk Tae Youn , 황순영 Soon Young Hwang , 하성식 Sung Sik Ha |
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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 25oC, 450oC. Friction coefficients (FC) of all of the 3 samples are decreased as increasing sliding surface temperature from 25oC to 450oC. FC of WC-CoCr decreases as increasing the surface temperature from 0.33 ± 0.02 at 25oC to 0.26 ± 0.02 at 450oC, 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 25oC and 450oC. These show that WC-CoCr is highly recommendable for protective coating on In718 and other metal components. |
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| Key Words |
| HVOF, WC-CoCr, Wear, Thermal spraying, HVOF, Taguchi program |
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