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염욕을 이용한 액상금속반응에 의한 Mg-Sb , Mg-Bi , Al-Sb 계 금속간화합물의 제조
김기호,윤우영 ( Ki Ho Kim,Woo Young Yoon ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.2
N/A The syntheses of intermetallic compounds through liquids reactions between two components are studied. Two different behavious to form the intermetallic compounds in the reaction are observed. One is a catastropic reaction which leads to a-rapid formation of intermetallic compounds and the other is a non-catastropic reaction which results to slow formation. The Mg-Bi and Mg-Sb system were selected to monitor the catastropic reaction and the Al-Sb system was chosen for the non-catastropic reaction. The reason of the reaction speed was rationalized by the heat evolution and the mixing enthalpies. Temperature for the Mg-Bi and Mg-Sb system was raised by about 250∼350℃ during intermetallic formations and the interface layer between the two liquids was planar and thick. But in the case of the Al-Sb system, temperature rise was only 4∼5℃ and many perforate and thin interfaces were observed. A new method to synthesize and separate the intermetallic compounds from the reacted liquids has also been developed. It is separated by density differences in a salt bath. The new method has been proved to attain the intermetallics without contamination from the base metals and can be applied not only to the Mg-Bi and Mg-Sb system which are catastropic reaction systems, but also the Al-Sb system which has slow reaction kinetics.
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김기호 ( Ki Ho Kim ),윤우영 ( Woo Young Yoon ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.2
To estimate the infiltration potential in metal binders, a new parameter, the EII (Effective Infiltration Index), which can be determined with the surface tension and viscosity data of each liquid metal used in the binder, is introduced. The parameter was found to be closely related to the measured infiltration distance. As an infiltrant for core bits, the Cu-Sn alloy with a higher EII value was selected and compared with the conventional Cu-Zn alloy. For the formation of harder rock, a finer W size in the matrix is generally used to maintain the cutting rate. However, in such a case, the infiltration potential becomes lower and a fully infiltrated microstructure cannot be obtained. In this study, the matrix with the Cu-Sn alloy showed an evenly infiltrated and sound microstructure up to a W size of 1 μm and had a longer tool life than the conventional Cu-Zn alloy in a simulated drilling test.(Received March 30, 2015)
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임정호,김기배,윤우영,윤의박 ( Jeong Ho Lim,Ki Bae Kim,Woo Yung Yoon,Eui Pak Yoon ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.5
N/A Formation of oxide inclusions in the molten aluminium alloys during solidification is investigated. The oxidation tendency of both Al-4.5wt%Cu and Al-7wt%Si alloys is increased with melt temperature, particularly over 700˚C. However, an Al-5wt%Mg alloy exhibits a decreasing mode over 800˚C. The oxidation behavior with holding time shows the S curve shape for all of the alloys. It is shown that the mechanism of oxidation of Al-5wt%Mg alloy has a two step process different from that of Al-4.5wt%Cu and Al-7wt%Si alloys. The species and morphology of oxide inclusions in each alloy is also shown. The microstructure was more coarsened during solidification when the melt contains a large amount of oxide inclusion than when it doesn`t. This result can be explained in terms of both the hindrance of heat extraction by oxide film formed on the aluminium melt and the difference of heat capacity between the aluminium melt and oxide inclusion during solidification. (Received March 2, 1998)
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