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주형에서 석탄분 첨가제 ( 시콜 ) 에 의한 주철주물의 소착억제기구에 관하여
홍영명,이영상,김동옥 ( Yung Myung Hong,Yeong Sang Lee,Dong Ok Kim ) 한국주조공학회 1983 한국주조공학회지 Vol.3 No.2
The mechanism of coal-dust action on inhibiting burn-on of Sand to iron castings was taken in consideration by means of casting test and thermal decomposition test. To compare the ability of inhibiting sand burn-on, test castings were produced in green sand moulds added three different coal-rusts. And quantitative determination of lustrous carbon and volatiles production for coal-dust samples were performed. The lustrous carbon production was in good agreement with the casting test result. But total voltiles production was relatively inefficient on hibiting sand burn-on to test castings. The lustrous carbon theory can be given to explain the mechanism which coal-dust inhibits sand burn-on to iron castings.
The Effects of Sc on the Microstructure and Mechanical Properties of Hypo-Eutectic Al-Si Alloys
김명한,홍영명,조해용 대한금속·재료학회 2004 METALS AND MATERIALS International Vol.10 No.6
The eutectic Si microstructure in Al-8.5wt.%Si alloy was changed from large flakes to fine lamellar when the Sc amount in the alloy reached 0.2 wt.%. 0.8wt.%Sc was optimal in terms of attaining the best modification effect. Study on the distribution of the modifiers and measurement of the surface tension of Al-8.5wt.%Si alloy melt with added Sr, Na, and Sc modifiers, respectively, reveals that Sc modifies eutectic Si by a decrease of surface tension, while Sr and Na modify eutectic Si mainly by an impurity-induced twinning mechanism. Al-8.5wt.%Si-0.4wt.%Sc alloy displayed approximately 50 and 70 % increases in tensile strength and elongation, respectively, over Al-8.5wt.%Si alloy in the cast state. It also presented approximately 65 and 70 % increases in tensile strength and elongation, respectively, over Al-8.5wt.%Si alloy at a ppt heat-treated state at 200 oC for 3 h.