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급냉응고한 Al-Pb-X(Sn , Sn-Si) 계 합금분말의 (合金粉末) 압연판재의 (壓延板材) 제조와 소결특성
최종구,문종태,이용호,조성석 ( Jong Gu Choi,Jong Tai Moon,Yong Ho Lee,Sung Suk Cho ) 한국주조공학회 1992 한국주조공학회지 Vol.12 No.3
N/A The measurement of the apparent and tap density for Al-Pb-X(Sn,Sn-Si) powders produced by centrifugal atomizer showed that the larger theoretically calculated densities the larger those densities. And tap densities were not over 50% of the theoretical densities. The nip angle of Al-5wt%Pb alloy powders produced with 38000 r.p.m. of disk rotation was 3°degree larger than that of Al-8.5wt%Pb-3wt%Sn(-4wt%Si, 8wt%Si) with 50000 r.p.m. The effects of roll gap and rolling speed on thickness and density of the single strips by rolling were that rolling speed increasing the thickness and density of strip decreased and roll gap increasing, the thickness of strip increased but the density decresed. The compactibility of Al-Pb-X with Al by rerolling showed that the coarse powder-strips were better than fine powder-strips. From the SEM study with EDX analysis on the sintered strips, it was found that Pb and Sn were segregated with maximum size 5㎛, and Si existed surrounding the segregation zone. After sintering the clad strips at 500℃, the pores, which were spherical with 5㎛ of mean diameter, partly remained around the particles of alloy powders area, while completely disappeared at clad interface. The hardness of strips of alloy powders decreased linearly with increasing sintering temperature.
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