Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Wear Property of HOVF WC-CrC-Ni Coating Prepared by Optimal Coating Process

최적 고속화염 용사 코팅 공정기술로 제조된 WC-CrC-Ni 코팅의 마모 특성

  • Joo, Yunkon (Department of Materials Science and Engineering, Changwon National University) ;
  • Yoon, Jaehong (Department of Materials Science and Engineering, Changwon National University) ;
  • Lee, Jehyun (Department of Materials Science and Engineering, Changwon National University)
  • 주윤곤 (창원대학교 나노신소재공학부) ;
  • 윤재홍 (창원대학교 나노신소재공학부) ;
  • 이재현 (창원대학교 나노신소재공학부)
  • Received : 2016.11.30
  • Accepted : 2017.01.26
  • Published : 2017.02.27
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Abstract

WC-CrC-Ni coatings were prepared by nine processes of the Taguchi program with three levels for the four spray parameters: spray distance, flow rates of hydrogen and oxygen, and powder feed rate. The optimal coating process (OCP) was oxygen flow rate of 38 FMR, hydrogen flow rate of 53 FMR, powder feed rate of 25 g/min, and spray distance of 7 inches. Hardness of 1150 Hv and porosity of 1.2 %, were obtained by OCP; these are better results compared with the highest 1033 Hv and the lowest 1.5 % porosity obtained by nine processes of the Taguchi program. Friction coefficient of the WC-CrC-Ni coating decreased from $0.36{\pm}0.07$ at $25^{\circ}C$ to $0.23{\pm}0.07$ at $450^{\circ}C$. These values were smaller than those of the EHC (electrolytic hard chrome) plating at both temperatures due to lubrication from the oxide debris. The wear trace and wear depth of the coating are smaller than those of the EHC at both temperatures. Pitting was not found in the WC-CrC-Ni coating sample, while it did appear in the EHC sample.

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References

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