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Zr기 필러메탈을 이용한 상용 순 티타늄(CP-Ti) 합금의 저온 브레이징 특성
선주현 ( J. H. Sun ),신승용 ( S. Y. Shin ),홍주화 ( J. W. Hong ) 한국열처리공학회 2016 熱處理工學會誌 Vol.29 No.1
Titanium and its alloys can be usually joined with brazing method. And the alloys should be brazed at low temperature to keep their original microstructure. In this study, the mechanical strength and microstructure of the CP-Ti joint-brazed with Zr54Ti22Ni16Cu8 filler metal having melting temperature of 774~783oC were investigated. The tensile strengths of the joint-brazed at 800oC with 100oC/min of cooling rate showed more than 400 MPa which was as high as base metal. The Widmanstatten structure consisting of Ti and Ti2Ni phase was observed in the joint area. However, the tensile strengths of the joint-brazed at 800oC with 15oC/min of cooling rate were decreased and the Ti, (Ti,Zr)2Ni and Ti2Ni phases were observed at the joint area. It is believed that the (Ti,Zr)2Ni laves phases could decrease the mechanical strength of the joint and the cooling rate should be controled to get high strength of the titanium joint. (Received December 3, 2015; Revised December 9, 2015; Accepted December 14, 2015)
스크린 플라즈마 질화법에 의해 처리된 STS316L 강 표면의 질화층에 관한 연구
채홍철, 홍주화 충북대학교 산업과학기술연구소 2013 산업과학기술연구 논문집 Vol.27 No.2
Screen plasma nitrided surface layer of STS316L stainless steel was studied by AES and in-situ XPS. The nitriding treatment was done using ultra high purity nitrogen gas under workpiece temperature range from R.T. to 600℃. Nitride layer composition was uniform, thickness was about 1 um and thin nitrogen penetration was attributed to zero bias of workpiece in this screen plasma method. It was confirmed that oxygen present on sample surface reacted with nitrogen gas forming NOx, and this acted as a passive film interfering nitride formation. Increasing sample temperature promoted CrN and Cr2N formation, reducing NO and NO2, and accordingly maximum thickness of CrN phase was achieved at 600℃. Nano-indentation hardness of nitride layer, measured up to depth of 500nm from surface, showed a high value of exceeding 11GPa, when processed at 600℃.