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Al-Si / SiCp 복합재료에서 SiC 의 편석에 미치는 응고 조건의 영향
김종찬,권혁무 ( Jong Chan Kim,Hyuk Moo Kwon ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.2
N/A The influence of solidification condition on the segregation of SiC particles in the Al-xSi/6wt%SiC_p(x: 6, 10, 14, 18wt%) cmposites 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㎛/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 φ 22㎛.
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Al-Si/$\{SiC}_{p}$ 복합재료 용탕에서 SiC 입자의 침강
김종찬,권혁무,Kim, Jong-Chan,Gwon, Hyeok-Mu 한국재료학회 1997 한국재료학회지 Vol.7 No.2
Remelting of $A-Si/SiC_{p}$ composites followed by isothermal holding and solidification, leads ro the settling of Sic particles to the bottom of the mold. With the isothermal holding time for molten $A-Si/SiC_{p}$ composites. the particle free zone increases rapidly up to approximately first 30 minutes of the holding time. Experimental resulls of the particle settling confirm that the larger SIC particles sink faster tlun the sniiller particles. An increase in volume fraction of Sic particles decreases the setrling velocity of the particles. AI-xSi/ySiC( x:6~18wt%, y: 3~9wt%, SiC 입자크기: $10~28{\mu}m$) 복합재료를 재용해한 후 항온 유지하고 응고 시킬때 SiC 입자가 몰드의 하부로 침강하는 현상을 계통적으로 조사하였다. AI-Si/SiC 복합재료 용탕을 항온으로 유지하면 입자가 없는 지역은 유지시간이 약 처음 30분 동안 빠르게 증가한다. SiC 입자가 크기가 클수록 SiC입자의 크기가 클수록 SiC입자의 침강속도가 빠르다. 또한 복합재료중 철가한 SiC 입자의 부피분율이 증가하면 입자의 침강속도는 감소한다.
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김종찬,최정묵,권혁무 ( Jong Chan Kim,Jung Mook Choi,Hyuk Moo Kwon ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.1
N/A The spiral fluidity of Al-xSi/ySiC (x:6∼18 wt.%, y:3∼9 wt.%, particle size:l0∼28 ㎛) composites melt was investigated in this study. Addition of SiC particles to the base alloy decreased the fluidity of the Al-Si/SiC_p composites melt. The spiral fluidity (F) of the Al-Si/SiC_p composites melt was influenced more directly by the surface area of the SiC particles (S) dispersed in the molten AI-Si alloy, rather than the volume fraction or size of SiC particles and this could be expressed by following empirical regression equations. F=27.269-0.011S (pouring temp.: 750˚C) at AI-6wt.%Si/SiC_p, F=41.635-0.019S (pouring temp.: 750˚C) at Al-18wt.%Si/SiC_p. The spiral fluidity of hypereutectic Al-Si/SiC_p composites melt increased with increaes in pouring temperature of the melt. However, the spiral fluidity of hypereutectic AI-Si/SiC_p composites melt did not increase significantly when the pouring temperature was increased above 780˚C (Received December 1, 1997)
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朴昌宣,金鍾贊,朴相俊,權赫茂 忠南大學校 産業技術硏究所 1992 산업기술연구논문집 Vol.7 No.1
The purpose of this study is to obtain basic infotmation on the wettability of pure-Al/Al₂O₃, Al-alloy/Cu, Al-alloy/Ni and Al-12%Si/Al₂O₃systems, by using the Sessile drop method. The wettability of Al alloy-melt on Al₂O₃increases with increasing temperature from 750℃ to 850℃ for Al-12%Si-y% (Cu, Zn and Mg) (y:0∼2)/Al₂O₃system, the contact angle decreases with increasing Cu, Zn and Mg content. The wettability of Al alloy on Cu and Ni-palte is better than that on Al₂O₃-plate : this is attributed to the interfacial reaction between the Al aiioy and the metal substrate.
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