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Cu-Fe계 합금의 강도 및 전기전도도에 미치는 Cr 원소첨가의 영향
김대현,이광학,Kim, Dae-Hyun,Lee, Kwang-Hak 한국재료학회 2010 한국재료학회지 Vol.20 No.2
This study looked at high performance copper-based alloys as LED lead frame materials with higher electrical-conductivity and the maintenance of superior tensile strength. This study investigated the effects on the tensile strength, electrical conductivity, thermal softening, size and distribution of the precipitation phases when Cr was added in Cu-Fe alloy in order to satisfy characteristics for LED Lead Frame material. Strips of the alloys were produced by casting and then properly treated to achieve a thickness of 0.25 mm by hot-rolling, scalping, and cold-rolling; mechanical properties such as tensile strength, hardness and electrical-conductivity were determined and compared. To determine precipitates in alloy that affect hardness and electrical-conductivity, electron microscope testing was also performed. Cr showed the effect of precipitation hardened with a $Cr_3Si$ precipitation phase. As a result of this experiment, appropriate aging temperature and time have been determined and we have developed a copper-based alloy with high tensile strength and electrical-conductivity. This alloy has the possibility for use as a substitution material for the LED Lead Frame of Cu alloy.
김용현,김대영,이광학 ( Yong Hyun Kim,Dae Young Kim,Kwang Hak Lee ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.3
N/A In thia study, wear resistance of P-V cast iron which is used as a material of cylinder liner for marine engine was investigated. Wear test was conducted by the wear test machine of Suzuki type(EFM-III-E model, 5000N for load, 4.0㎧ for velocity, Japan). Adhesive and scuffing wear phenomena was studied when load was changed from 60N to 400N and wear velocity was 0.25㎧ at room temperature and 250℃. In the case of dry friction at room temperature, scuffing phenomena of wear test specimens without vanadium was occurred at 400N, specimens with vanadium at the 400N was observed only adhesive wear phenomena. In the case of dry friction at 250℃, scuffing phenomena was observed at 180N for wear specimens without vanadium and 240N for wear specimens with vanadium.
고압주조법에 따른 ADC12 합금의 미세조직과 기계적 성질
김억수,김용현,이광학,김흥식,김영홍 ( Ok Soo Kim,Yong Hyun Kim,Kwang Hak Lee,Heung Sik Kim,Young Hong Kim ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.1
N/A Front housings(a part for automobile) were die cast using ADC12 alloy by various die casting techniques such as ordinary die casting(OD), squeeze casting(SQ) and partial squeeze-pore free die casting(POD). Casting defects of those front housings and their mechanical properties were examined and compared. Casting defects such as blowholes and pinholes normally formed in OD method were eliminated by applying SQ or POD techniques. Tensile strength and elongation of die casting produced by SQ or POD techniques were 1.4 and 2.6 times higher than that of ordinary die castings. Tensile strength and elongation of ADC12 alloy front housings produced by SQ or POD techniques were increased by T6 treatment up to 38㎏/㎟ and 2.7 % respectively.
스퀴즈 병용 다이캐스팅법에 의한 Al-21%Si 합금의 결함제어에 관한 연구
김억수,김용현,이광학,김흥식 ( Ok Soo Kim,Yong Hyun Kim,Kwang Hak Lee,Heung Sik Kim ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A Partial squeeze die casting is a special die casting process which combines squeeze technique to conventional die casting. The influence of squeeze pressure (1500-3000㎏/㎠) and time-lags(0.5-2.0sec) on defect control, density and microstructure of ADC12 alloy die casts has been studied by appling partial squeeze die casting to air compressure front housing production. Defect free, maximum density of 2.736㎏/㎤ with sound microstructure of ADC12 alloy die cast has been obtained by partial squeeze die casting technique at the pressure of 2000-2500㎏/㎠ and time-lags of 1.0-2.0sec.
용융 알루미늄내에서 개재물의 크기분포 및 농도측정에 관한 연구
안정,문광호,이광학 ( Jeong An,Kwang Ho Moon,Kwang Hak Lee ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.1
N/A The concentration and particle size distribution of non-metallic inclusions which suspended in the molten aluminum at 700℃ were measured by using LiMCA apparatus. The result revealed that the number of inclusions increased with increasing the applied current or decreasing the orifice diameter, while decreased with increasing the purity of aluminum. And also, it was found that the number of inclusions increased with increasing the amount of boron added to molten aluminum. This was found to be attributed to the formation of the inclusions of TiB and V₃B₂. It was investigated that the average concentration of inclusions in a constant volume of 20㎖ of molten aluminum was increased in the order of pure molten aluminum, molten aluminum containing 20ppm of boron and molten aluminum used repeatly in the experimental casting in this study.
전자기력을 이용한 A1 scrap 으로 부터 과공정 A1 - Si 합금의 제조
윤지현(Ji Hyun Yoon),문광호(Kwang Ho Moon),김용현(Yong Hyun Kim),이광학(Kwang Hak Lee) 한국주조공학회 2001 한국주조공학회지 Vol.21 No.6
N/A The objective of this study is to investigate on manufacturing Al-scrap into hypereutectic Al-Si alloy by using electromagnetic force. The Fe element in the aluminium scrap was controlled by intermetallic compound method and using EMF(electromagnetic force). The most lumped compound was found after 10min holding at 690℃. A number of segregated compound was revealed when imposed to EMF at 30A. The refinement of primary Si particles was achieved by EMF stirring. Primary Si particles were refined and spheroidized most of all with the magnetic intensity of 180G for 10 min.