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최적 고속화염 용사 코팅 공정기술로 제조된 WC-CrC-Ni 코팅의 마모 특성
주윤곤,윤재홍,이재현,Joo, Yunkon,Yoon, Jaehong,Lee, Jehyun 한국재료학회 2017 한국재료학회지 Vol.27 No.2
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.
SKD61과 Radical Nitriding 처리된 SKD61 Arc Ion Plating으로 증착된 TiN 박막의 미세구조 및 기계적 특성에 관한 연구
주윤곤,송기오,윤재홍,조동율,박봉규,정길봉,정윤조 한국표면공학회 2007 한국표면공학회 학술발표회 초록집 Vol.2007 No.-
최근 기계가공기술의 발달에 따라 내마모용 TiN박막의 수요가 증가하였고, TiN박막은 내마모용으로 높은 경도 및 밀착력을 필요로 한다. TiN박막을 증착시키는 방법은 PVD, CVD 등 여러가지 가 있으나 본 연구에서 공구강 SKD 61기판 표면과 Radical Nitriding(RN) 처리된 SKD 61기판에 arc ion plating(AIP)를 이용하여 TiN박막을 증착시켜 표변경도를 향상시키고, 이 코팅층의 미세구조가 기계적 특성에 미치는 영향을 연구하였다. 그 결과 RN처리된 SKD61에서 코팅 두께가 많이 나왔고, 스크래치테스트 결과 접착력이 향상되었음을 알 수 있었다.
최적 고속화염용사법으로 제조된 Diamalloy4006 코팅의 내마모 특성
주윤곤,윤재홍,정연길,이재현,Joo, Yunkon,Yoon, Jaehong,Jung, Yeongil,Lee, Jehyun 한국재료학회 2015 한국재료학회지 Vol.25 No.9
The effects of coating parameters were investigated in wear resistance coatings of Diamalloy-406 on Inconel 718 to obtain an optimum coating condition by high velocity oxy-fuel spraying. The coating parameters, the flow rates of source gases (hydrogen and oxygen), the powder feed rate, and the spray distance, were designed by the Taguchi method. The optimal conditions were determined: oxygen flow rate 34 FRM, hydrogen flow rate 57 FRM, powder feed rate 35 g/min, and spray distance 7 inch. Friction coefficients of the coating and the substrate decreased with an increasing sliding surface temperature from $25^{\circ}C$ to $450^{\circ}C$. The friction coefficient of Diamalloy-4006 coating decreased as the sliding surface temperature increased from $0.43{\pm}0.01$ at $25^{\circ}C$ to $0.29{\pm}0.01$ at $450^{\circ}C$. The wear trace and wear depth of the coating were smaller than the substrate at all temperatures tested. The relationship between spray parameters and wear resistance was discussed extensively, based on the measured roughness, hardness, and porosity in each coating.
초고속화염용사 WC-CoFe 코팅층의 레이저 표면 열처리 효과
주윤곤,윤재홍,이재현,Joo, Yunkon,Yoon, Jaehong,Lee, Jehyun 한국재료학회 2019 한국재료학회지 Vol.29 No.1
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 $W_2C$. 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 $150{\mu}m$ to $100{\mu}m$. 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.