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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.1 pp.52-58
DOI : https://doi.org/10.3740/MRSK.2019.29.1.52

Effect of Laser Heat-treatment on WC-CoFe Coated Surface by HVOF

Yunkon Joo2, Jaehong Yoon1, Jehyun Lee1,2†
1Department of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Republic of Korea
2Engineering Research Center(ERC) for Integrated Mechatronics Materials and Components, Changwon National University, Changwon, Gyeongnam 641-773, Republic of Korea
Corresponding author
E-Mail : ljh@changwon.ac.kr (J. Lee, Changwon Nat'l Univ.)

Abstract

The microstructure, hardness, and wear behaviors of a High Velocity Oxygen Fuel(HVOF) sprayed WC-CoFe coating are comparatively investigated before and after laser heat treatments of the coating surface. During the spraying, the binder metal is melted and a small portion of WC is decomposed to W2C. A porous coating is formed by evolution of carbon oxide gases formed by the reaction of the free carbon and the sprayed oxygen gas. The laser heat treatment eliminates the porosity and provides a more densified microstructure. After laser heat treatment, the porosity in the coating layer decreases from 1.7% to 1.2 and the coating thickness decreases from 150 μm to 100 μm. The surface hardness increases from 1440 Hv to 1117 Hv. In the wear test, the friction coefficient of coating decreases from 0.45 to 0.32 and the wear resistance is improved by the laser heat treatment. The improvement is likely due to the formation of oxide tribofilms.

초고속화염용사 WC-CoFe 코팅층의 레이저 표면 열처리 효과

주용곤2, 윤재홍1, 이재현1,2†
1창원대학교 신소재공학부, 2창원대학교 메카트로닉스 융합부품소재 연구센터(ERC)

초록

 

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