• 한국주조공학회지
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• 제17권2호
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• pp.180-187
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• 1997

The influence of solidification condition on the segregation of SiC particles in the $Al-xSi/6wt%SiC_p$(x: 6, 10, 14, 18${\cdot}$wt%) composites was investigated in the study. The results are as follows: 1) During the counter-gravity unidirectional solidification of $Al-Si/SiC_p$ composites melt, most of the SiC particles are pushed to the top of the casting. 2) The SiC particles pushing in the $Al-Si/SiC_p$ composite melts are not observed, when the interface velocity of melts increases more than 1.41 ${\mu}m/sec$. 3) The SiC particles are entrapped in the interdendrite regions, when the sizes of SiC particles in the $Al-Si/SiC_p$ composites are large than ${\varphi}22{\mu}m$.

• 한국주조공학회지
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• 제9권4호
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• pp.320-326
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• 1989

Titanium-Boron-Aluminium master alloys are used extensively to grain-refine a wide range of aluminium alloys. This experiment was performed by various amounts of AlTi5B1 addition to the technical aluminium alloys, and also by changing cast temperature and hold time of the melts. The macrostructures were shown that with increasing the addition of AlTi5B1 to the melts, the grain became finer. In the case of cast temperature high enough over $900^{\circ}C$, the grain became coarser, but hold time change not affected on the grain refinement. Particles of $TiAl_3$, and $TiB_2$ were found in the grains and grainboundaries. The important role of grain refinement in this experiment were mainly $TiAl_3$, and also $TiB_2$ those have been confirmed in TEM, SEM, EDS, WDX and X-ray diffraction.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1988년도 추계학술대회 논문집
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• pp.64-66
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• 1988

The present investigation has been performed on the manufacturing process of Ni-P doped W-Cu electric contacts by infiltration techniques. The addition of small amount of Ni-P alloy aimed at forming a rigid and homogeneous skeleton structure of W-powders which favours subsequent infiltration process of Cu-melts. The experimental results revealed that the small addition of Ni-P alloy appreciably enhances the sintering process of W at low temperatures (even at 1000$^{\circ}C$), simultaneously causing a considerable change of skeleton Morphology and its related best infiltration behaviour of Cu-melts.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2001년도 제33회 춘계학술대회 개최
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• pp.248-256
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• 2001

Capacities of screw are pumping, steady flow of polymer melts, volumetric efficiency, steady volumetric throughout etc. they are affected by geometry of screw, heat flux, pressure on inside barrel, rotating velocity, friction coefficient at screw surface etc. Also the temperature of polymer melts by heating pad and injection pressure play a very important role in the injection molding machine. by computation volumetric efficiency increases as rotating velocity increases, flight number increses, and decreases as friction coefficient increases. but volumetric throughout is different :s flight number increases with helix angle variability. so in this paper we analyze thermal distortion and stress of screw includes pressure and temperature distributions by finite element analysis to understand what design factors influence on thermo-mechanical characteristics of screw.

• 공업화학
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• 제23권2호
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• pp.143-147
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• 2012

퍼라이트의 팽창은 고온에서 수초안에 이루어지므로 팽창현상을 실험으로 확인이 어려워 이를 해석하기 위한 버블팽창모사가 필요하다. 이를 위해 용융 퍼라이트 내에 매우 작은 미세 버블이 존재하며 수분 증기가 버블 쪽으로 확산되어 버블이 성장하고 퍼라이트가 팽창하는 모델을 세워 팽창모사를 수행하였다. 수분증기의 확산으로 버블이 성장하여 퍼라이트가 팽창될 때 퍼라이트의 동적 온도는 감소하였다. 버블의 동적압력은 퍼라이트 용융상 내에서 수분 증기가 확산함에 따라 초기에는 증가하지만, 버블의 급격한 팽창 이후에는 오히려 감소함을 확인하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 추계학술대회 논문집
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• pp.239-240
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• 2008

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 1993년도 EARTH 발표논문초록
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• pp.24.2-24
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• 1993

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 1998년도 제1회 총회 및 추계학술발표회
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• pp.31-31
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• 1998

• 한국전기화학회:학술대회논문집
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• 한국전기화학회 1998년도 제1회 총회 및 추계학술발표회
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• pp.94-94
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• 1998

• 한국재료학회:학술대회논문집
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• 한국재료학회 1996년도 재료학회 추계학술발표회
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• pp.7-8
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• 1996