75wt.%Ag-25wt.%Pd합금의 Zr첨가에 따른 미세조직변화와 기계적성질에 관한 연구
A STUDY ON THE EFFECTS OF Zr ADDITION ON MECHANICAL PROPERTIES AND MICROSTRUCTURES OF 75Ag-25Pd Alloy
정호년, 김명호, 김혜성, 김경남, 백홍구,
소속 상세정보
정호년 ( Jung H. N. ) - 동명치재산업사
김명호 ( Kim M. H. ) - 연세대학교 공과대학 금속공학과
김혜성 ( Kim H. S. ) - 연세대학교 치과대학 치과재료학연구소
김경남 ( Kim Kyoung-Nam ) - 연세대학교 치과대학 치과재료학교실
백홍구 ( Baik H. K. ) - 연세대학교 공과대학 금속공학과
KMID : 0362219950220020217
Abstract
The effects of Zr addition on the microstructures and mechanical properties of 75wt.%Ag-25wt.%Pd alloy was studied.
Grain size of the alloy was diminished with increasing amount of Zr addition, and it was notable when 0.2wt.% of Zr was added.
when 0.6wt.% of Zr was added, coarse Pd₃Zr intermetallic compound(hexagonal, ??, ??) was precipitated in the matrix, and fine Pd₂Zr intermetallic compound(body centered tetragonal, ??, ??) could be seen by aging treatment at 450℃.
Ultimate tensile strength of the alloy was increased with decreasing grain size until 0.2 wt.% Zr addition, but when an excess of Zr was added, ultimate tensile strength of the alloy was somewhat diminished despite of decreasing grain size.
So, we concluded that the grain size of the 75wt.%Ag-25Wt.%Pd alloy was diminished by the Zr addition and mechanical properties were increased with decreasing grain size, and the optimum amount needed for hardening was 0.2 wt.%.
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