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고에너지 전자빔 투사를 이용한 TiC, TiB<sub>2</sub> 및 VC/ 탄소강 표면합금화 연구
유정훈,신기삼,윤재홍,이찬규,허성강,이재현,오준철,이성학,어광준,Yoo, Jung-Hoon,Shin, Kee-Sam,Yoon, Jae-Hong,Lee, Chan-Gyu,Hur, Sung-Gang,Lee, Je-Hyun,Oh, Jun-Chul,Lee, Sung-Hak,Euk, Kwang-Jun 한국재료학회 2002 한국재료학회지 Vol.12 No.12
Surface alloying using TiC, $TiB_2$ and VC ceramic particles on carbon steel has been performed using high voltage electron beam. Each type of ceramic particles was mixed with flux of Al and $MgF_2$ in 1 to 4 ratio. The microstructures of the surface alloyed layers consisted of melted region, interface region. heat affected region and the unaffected matrix. The surface layer of the TiC surface alloyed had a cubed primary and a eutectic type of TiC. $TiB_2$ in surface layer of $TiB_2$ surface alloyed were incompletely melted with$ TiB_2$ particles as observed before the alloying. On the surface layer of the VC surface alloyed, very well defined cell structure was observed with VC on the cell boundary. In addition, ~50 nm in diameter VC particles in high density were ubiquitous in the matrix. Those fine VC particles prominently improved the hardness and wear resistance of the surface layer of the VC surface alloyed.
고속화염용사코팅으로 제조된 WC-CoFe 코팅의 기계적 특성에 관한 연구
주윤곤 ( Yun Kon Joo ),조동율 ( Tong Yul Cho ),하성식 ( Sung Sik Ha ),이찬규 ( Chan Gyu Lee ),천희곤 ( Hui Gon Chun ),허성강 ( Sung Gang Hur ),윤재홍 ( Jae Hong Yoon ) 한국열처리공학회 2012 熱處理工學會誌 Vol.25 No.1
HVOF thermal spray coating of 80%WC-CoFe powder is one of the most promising candidate for the replacement of the traditional hard chrome plating and hard ceramics coating because of the environmental problem of the very toxic Cr6+ known as carcinogen by chrome plating and the brittleness of ceramics coatings. 80%WC-CoFe powder was coated by HVOF thermal spraying for the study of durability improvement of the high speed spindle such as air bearing spindle. The coating procedure was designed by the Taguchi program, including 4 parameters of hydrogen and oxygen flow rates, powder feed rate and spray distance. The surface properties of the 80%WC-CoFe powder coating were investigated roughness, hardness and porosity. The optimal condition for thermal spray has been ensured by the relationship between the spary parameters and the hardness of the coatings. The optimal coating process obtained by Taguchi program is the process of oxygen flow rate 34 FRM, hydrogen flow rate 57 FRM, powder feed rate 35 g/min and spray distance 8 inch. The coating cross-sectional structure was observed scanning electron microscope before chemical etching. Estimation of coating porosity was performed using metallugical image analysis. The Friction and wear behaviors of HVOF WC-CoFe coating prepared by OCP are investigated by reciprocating sliding wear test at 25oC and 450oC. Friction coefficients (FC) of coating decreases as sliding surface temperature increases from 25oC to 450oC. (Received October 31, 2011; Revised November 15, 2011; Accepted December 16, 2011)