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Sn-3.5wt%Ag 비납솔더를 이용한 미세피치 솔더접합부의 신뢰성에 관한 연구
하범용,이준환,신영의,정재필,한현주 대한용접접합학회 2000 대한용접·접합학회지 Vol.18 No.3
As solder becomes small and fine, the reliability and solderability of solder joint are the critical issue in present electronic packaging industry. Besides the use of lead(Pb) containing solders for the interconnections of microelectronic subsystem assembly and packaging has enviromental problem. In this study, using Sn/Pb and Sn/Ag eutectic solder paste, in order to obtain decrease of solder joint strength with increasing aging time, initial solder joint strength and aging strength after 1000 hour aging at $100^{\circ}C$ were measured by peel test. And in order to obtain the growth of intermetallic compound(IMC) layer thickness, IMC layer thickness was measured by scanning electron microscope(SEM). As a result, solder joint strength was decreased with increasing aging time. The mean IMC layer thickness was increased linearly with the square root of aging time. The diffusion coefficient(D) of IMC layer was found to $1.29{\times}10^{-13}{\;}cm^2/s$ at using Sn/Pb solder paste, 7.56{\times}10^{-14}{\textrm}{cm}^2/s$ at using Sn/Ag solder paste.
하범용,이준환,윤준호,신영의 중앙대학교 기술과학연구소 2000 기술과학연구소 논문집 Vol.30 No.-
본 연구에선 실제적으로 전자 제품에 사용되고 있는 패키지(QFP : 피치간격 0.8mm, TSOP : 피치간격 0.4mm)를 사용하여 Sn/Ag 공정 솔더 페이스트를 사용하여 온도 조건에 따른 솔더 접합부의 초기 접합 강도를 45°Peel test를 통해 측정하였으며, Aging시간을 변수로 하여 솔더와 구리 합금 사이에서 생성되는 IMC층의 두께를 측정, 분석하여 Sn/Pb 공정 솔더 페이스트를 사용했을 경우와 비교, 검토하였다. 실험결과로부터 비납솔더인 Sn/Ag 공정 솔더를 사용하여 접합부의 품질 및 장기신뢰성(고온유지) 측면에서 만족할만한 결과를 얻었으며, Sn/Pb 공정솔더의 대체 재료 가능성을 실험을 통하여 입증하였다. As solder joint become small and fine, the reliability and solderability of solder joint is the critical issue in present electronic packaging industry. Besides the use of lead(Pb) containing solders for the interconnections of microelectronic subsytem assembly and packaging has enviromental issue. In this study, using Sn/Pb and Sn/Ag eutectic solder paste, to obtain decrease of solder joint strength with aging time, initial solder joint strength and aging strength after 1000 hour aging at 100℃ were measured by peel test. And to obtain the growth of intermetallic compound(IMC) layer thickness, IMC layer thickness was measured by scanning electron microscope(SEM). As a result, solder joint strength was decrease with aging time increasing. The mean IMC layer thickness was increased linearly with the square root of aging time. The diffusion coefficient(D) of IMC layer was found to 1.29×10 exp (-13) ㎠/s at using Sn/Pb solder paste, 7.56×10 exp (14) ㎠/s at using Sn/Ag solder paste.
레일코팅재를 이용한 곡선부 레일마모저감에 관한 실험적 연구
하범용(Beom-Yong Ha),박용걸(Yong-Gul Park),이동욱(Dong-Wook Lee),최정열(Jung-Youl Choi),강윤석(Yun-Suk Kang) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The goal of this Paper is to reduce rail's wear in curved track by applying an additional surface layer material(High hardness and High resistance capacity of wear) on the top of the railhead. In order to evaluate appropriation of a coating material experimental tests such as the varieties of fundamental properties tests (hardening wear tensile and bending) and RCF(rolling contact fatigue)test were performed to establish fatigue wear and damage mechanism. As a result wear performance of coating rail is better than heated rail about 6times and normal rail about 8~9times.
전기분해에 의해 제조된 NaOCl을 이용한 염색폐수의 처리 특성(I)
윤용수,하범용,노방타잉후이,Yoon, Yong-Soo,Ha, Beom-Yong,Thanh Huy, Ngo Van 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.5
This study was carried out to investigate the feasibility of using electrolytically generated NaOCl solution for treatment of wastewater containing an acid dye(C.I. Acid Red 114). The NaOCl was produced by the electrolysis of aqueous NaCl solution. In order to asses the treatment characteristics, we evaluated the effect of pH and mixing ratio of the NaOCl solution to colored wastewater on the color and chemical oxygen demand$(COD_{Mn})$ removal. The optimum conditions for the dye and $COD_{Mn}$ removal were determined to be pH 5.0 and mixing ratio of 1 :9, at which more than $88\%$ color and $87\%$ $COD_{Mn}$ were removed within 10 min reaction time. Reaction rate constants for the 300 and 500mg/l of artificially prepared dyeing wastewater were estimated as 0.1764 and $0.1737 min^{-1}$ for color removal and 0.1197 and $0.1436 min^{-1}$ for $COD_{Mn}$ removal, respectively.
Sn-3.5wt%Ag 무연솔더를 이용한 μBGA 솔더접합부의 열피로수명 예측
이준환,하범용,신영의 중앙대학교 기술과학연구소 2000 기술과학연구소 논문집 Vol.30 No.-
본 연구에서는 μBGA와 Pb-free 솔더에 대한 수명평가방법을 제시하기 위하여 μBGA에 대하여 37wt%Pb-Sn 공정 솔더와 Sn-3.5wt%Ag 솔더를 채택한 3차원 유한요소해석모델을 구성해 보았다. 점탄소성거동에 대비하여 구성되어진 각각의 모델 중, 먼저 일반적인 솔더 형상을 가진 모델에 대하여 솔더 재질별로 온도범위 -40∼120℃, -20∼100℃, 20∼100℃의 세 가지 열사이클을 3회씩 가하여 솔더 접합부 계면에 집중되어진 응력과 변형율의 분포를 유한요소해석을 통해 살펴보았다. 또한 온도 변화에 따른 ΔT와 용융온도 T_M등의 변수를 이용하여 얻어진 γ를 이용하여 열피로수명식을 유도하였다. This study discusses thermal fatigue prediction of μBGA(Micro Ball Array) solder joint. Analysis method is used to three-dimensional finite element analysis with various solder alloys such as Sn-37wt%Pb, Sn-3.5wt%Ag under temperature cycling. Strain values, along with the result of solder material fatigue tests, were then used to predict the solder joint fatigue life with Coffin-Manson equation. As a result, it could be found that Sn-3.5wt%Ag has longer fatigue life than Sn-37wt%Pb in Low cycle fatigue. And using the analysis result, derive modified Coffin-Manson equation with temperature dependent factor γ.
전기분해에 의해 제조된 NaOCl을 이용한 염색폐수의 처리 특성(II)
윤용수,하범용,Yoon, Yong-Soo,Ha, Beom-Yong 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.4
This study was performed to determine the feasibility of electrolytically produced NaOCl solution for the treatment of dyeing wastewater discharged from textile industry. Industrial dyeing wastewater was pre-treated by PAC coagulant and the optimal pH and dosage for coagulation were 6.5 and 0.05 v/v%, respectively In this pre-treatment process $COD_{Mn}$, color and suspended solids removal efficiency were 66%, 91% and 85%, respectively. After pre-treatment by coagulation, NaOCl solution made by electrolysis was used for the treatment of industrial wastewater. The optimal mixing ratio with NaOCl solution and dyeing wastewater was determined to be 1:5 at pH 5.0 and in these conditions, color and removal efficiency were 99% and 88%, respectively. From these results, we can expect that NaOCl solution produced by electrolysis with salt of a lower price can be used for the treatment of industrial dyeing wastewater conveniently and effectively, and can overcome disadvantage of a commercial NaOCl solution with a bad storage and delivery properties to decreas oxidation ability.
염색폐수의 전해처리에 의한 탈색 및 COD , TOC 제거 특성
전영규,하범용,박근원,윤용수 한국공업화학회 1998 한국공업화학회 연구논문 초록집 Vol.1994 No.1
This study was performed to measure and evaluate the characteristics of COD and TOC removal, and decolorization efficiency in the electrolytic treatment by using iron anode and aluminum cathode for the acid dye Red 114 generally known the most difficult to degrade in the dyestuff. The electrolysis can be feasible to Dye-wastewater cause of high decolorizing efficiency. high COD removal efficiency, and short reaction time.