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이방식,도변광상,김윤채 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.11
Sintering behavior of iron compacts with 2.5 wt.% of(Sn, Cu) additives has been investigated, and the results were compared with those of Fe compact and Fe-4.0 wt.% Cu compact. In this work, the effects of sintering temperature, composition of Sn-Cu additive and admixing method of the additives on dimensional change, formation of interconnecting porosity and radial crushing strength were experiementally studied. The Fe-2.5 wt.% (Sn, Cu) compacts sintered at 890℃ showed better properties for porous bearing application than any of the Fe compact and the Fe-4.5 wt.% Cu compact sintered at 1150℃. Specimen admixed with (Sn, Cu) additive whose Sn/Cu ratio of 35/65 showed highest radial crushing strength, and admixing methods did not show any noticable differences in the strength. Sintering process during heating was studied by analyzing room temperature microstructures with EPMA and X-ray diffraction and the role of the additives in this system was discussed in detail.
이방식,도변광상,김윤채 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.3
The properties of Fe-Sn sintered compact for porous bearing and the phenomena appearing in heating process of Fe-1.0 Sn mixed powder compacts were investigated in comparsion with those of Fe powder compact, The results obtained are as follows. 1. When Fe-1.0 Sn mixed powder compact is sintered at temperatures above about 1000℃, the dimensional change and intercommunicating porosity are almost same with those of Fe compact, but the radial crushing strength is higher than that of Fe compact. 2. When Fe-1.0 Sn mixed powder compact is heated the liquid tin which formed at its melting point penetrates into capiliaries of Fe skeleton at temperatures above about 350℃. And with the rising temperature up to about 900℃, the Sn liquid react with Fe powder to form various Fe-Sn intermetallic compounds; θ, η, E and ζ. But at temperature above about 1000℃, all the intermetallic compounds became to a phase of Fe-Sn solid-solution having a higher self-diffusion coefficient than that of the γ phase. As a result Fe-1.0 Sn compact have a higher strength and more shrinkage ratio than Fe compact when sintered at temperatures above about 1000℃, which is usually employed in the case of sintering of Fe base compacts.