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김기배,김도향,이호인 ( Ki Bae Kim,Do Hyang Kim,Ho In Lee ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.2
N/A The wetting behaviour of SiC /Al-Li composite interface has been investigated by using an infiltration method. The critical pressure for melt infiltration into SiC particulate preform has been determined by measuring the melt infiltration distance changes with the variation of applied pressure. The threshold pressure of pure Al, Al-0.2wt%Li, Al-0.5wt%Li for melt infiltration are 3.94, 3.93> 3.75㎏/㎠ respectively, which implies a slight improvement in wettability of SiC /Al composite by addition of Li. The threshold pressure for melt infiltration also changes with the variation of other parameters such SiC particulate size, SiC particulate fraction and melt temperature.
스퀴즈캐스팅용 Salt Core 의 제조 및 용탕침투성에 관한 연구
김기배,노상우,이호인,남태운 ( Ki Bae Kim,Sang Woo Noh,Ho In Lee,Tae Woon Nam ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.4
N/A Developing a salt core for squeeze casting process, two different salt cores(pure salt core and mixed salt core) were fabricated and investigated. Pure salt core was composed of 100% NaCl and mixed salt core was made by mixtures of NaCl with MgO(1%), Na₂B₄O_7(2%), and talc(1%) as a binder or a strengthening agent. Salt cores were compacted to various theoretical density, heat treated, and then squeeze-cast with molten Al alloy(AC8A). The compression strength of salt cores were measured and the squeeze-cast products were examined for shape retention, infiltration of molten metal into the cores, and microstructures. The shape of salt core compacted at above 75% of the theoretical density was maintained stably. The higher theoretical density of salt cores gave higher compression strength, and the compression strength of mixed salt core was higher than that of pure salt core. Namely at 90% theoretical density, the compression strength of mixed salt core was 6.3㎏/㎟, compared to 4.6㎏/㎟` for pure salt core. At a squeeze casting pressure of 1000㎏/㎠, molten Al alloy was infiltrated into pure salt core of under 85% of the theoretical density. At squeeze casting pressure of 1000㎏/㎠, only mixed salt core above 90% of the theoretical density were valid, but the shape of the core was altered in the case of pure salt core at 90% of theoretical density. A key factor for developing a salt core for squeeze casting process was estimated as the ultimate compressive strength of salt core.
김기배,김태욱,최성희,Kim, Ki-Bae,Kim, Tae-Wook,Choi, Sung-Hee 대한한방안이비인후피부과학회 2016 한방안이비인후피부과학회지 Vol.29 No.2
Objectives : This study was to performed to investigate the effect of herbal steam therapy on acne vulgaris. Methods : 6 patients with acne vulgaris were treated with korean medicine therapy (herbal medicine and acupunture) including herbal steam therapy. We evaluated the effect by Korean Acne Grading System(KAGS) and Pictures. Results : After treatment, the KAGS Grade of all patients treated with korean medicine therapy including herbal steam therapy is 1. Based on this, we could find that korean medicine therapy including herbal steam therapy is effective and available to ameliorate for the symptoms of acne vulgaris. Conclusions : This clinical cases study shows us that korean medicine therapy including herbal steam therapy seem to be effective to improve symptoms of acne vulgaris. Further studies will be needed to identify herbal steam therapy is beneficial to acne vulgaris.
Tensile strength and fracture toughness of two magnesium metal matrix composites
김기배,S. Jayalakshmi,Satish V. Kailas,S. Seshan,E. Fleury 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.3
Metal matrix composites of two magnesium alloys (AM100 and ZC63) with saffil alumina fibre reinforcements were produced using a squeeze infiltration technique. Mechanical properties were assessed, followed by analysis of the fractured specimens. From the strength, toughness and the fractographic analysis, attempts were made to elucidate the influence of the matrix, fibre volume fraction and the fibre/matrix interface on the properties. Metal matrix composites of two magnesium alloys (AM100 and ZC63) with saffil alumina fibre reinforcements were produced using a squeeze infiltration technique. Mechanical properties were assessed, followed by analysis of the fractured specimens. From the strength, toughness and the fractographic analysis, attempts were made to elucidate the influence of the matrix, fibre volume fraction and the fibre/matrix interface on the properties.
용탕단조법에 의한 AC8A / Al2O3 복합재료의 기계적 성질에 관한 연구
김기배,김경민,조순형,윤의박 ( Ki Bae Kim,Kyoung Min Kim,Soon Hyung Cho,Eui Park Yoon ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.6
N/A In this study the fabrication technology and mechanical properties of AC8A/Al₂O₃ Composites by squeeze casting process were investigated to develope for application as the piston materials that require good friction, wear resistance, and thermal stability. AC8A/Al₂O₃ composistes without a porosity and the break of preform were fabricated at the melt temperature of 740℃, the preform temperature of 500℃, and mold temperature of 400℃ under the applied pressure of 1200㎏/㎠ as the results of the observation of microstructures. As the results of this study, the tensile strength of AC8A /Al₂O₃composites was not increased linearly with Al₂O₃volume fraction and so it seemed not to agree with the rule of mixture, which had been used often in metal matrix composite. Also the tensile strength after thermal fatigue test was little different from that before the test. Consequently it was thought that AC8A /Al₂O₃composites fabricated under our experimental conditions had a good thermal stability and subsequently a good interface bonding. Wear rate(i.e., volume loss per unit sliding distance) of AC8A/Al₂O₃composites was decreased with Al₂O₃volume fraction and the sliding speed at both room temperature and 250℃ and so there was a good correlation between wear rate and hardness. Also the wear rate of AC /8A20% Al₂O₃composities was obtained the value of 1.65 ㎤/㎝ at sliding speed of 1.14m/sec as compared with about 3.0×10^(-8)㎤/㎝hyereutectie Al-Si alloy(Al-16%Si-2%Cu-1%Fe-1%Ni), which applied presently for piston materials. The wear behavior of Al₂O₃composites was observed to a type of abrasive wear by the SEM view of wear surface.
Optimization of melt treatment for in-house recycling of Al alloy scrap
김기배,석현광,김영석,윤종철,이덕영,정창렬,한도석 한양대학교 세라믹연구소 2006 Journal of Ceramic Processing Research Vol.7 No.3
The production of premium quality castings for structurally safe components for aerospace and automotive applications requires that porosity and inclusions be minimized or eliminated to negate their harmful influence on the mechanical properties. Also in order to achieve a competitive advantage in the automotive industry it has become necessary to use Al alloy scrap to keep the cost-down of the material. A riser and runner part of a cylinder head from the gasoline engine of an automobile was used as the Al alloy scrap. For in-house recycling of Al alloy scrap the variations of the content of alloying elements, microstructures, mechanical properties, and volume of inclusions were examined with respect to the frequency of scrap use and the variations of various inclusions were measured according to different melt treatments. The contents of Mg, Si, Ca, and Sr decreased, but Fe increased with the frequency of scrap use. The tensile strength and yield strength of Al alloy scrap were slightly decreased but not significantly changed, but the fracture toughness and elongation to failure almost halved due to the increase of total volume of inclusions according to the frequency of scrap use. The majority of oxide film and inclusions in Al alloy scrap was removed by a fluxing treatment, but the fluxing treatment followed by a treatment in a Gas Bubbling Filtration (GBF) resulted in a significant increase in the volume of oxide film. The fluxing treatment was the most effective in removing the oxides and inclusions from the Al scrap melt.