금속-세라믹용 Pd-Au-Ag-Sn계 합금의 모의 소성에 따른 경도변화에 미치는 냉각 속도의 영향
Effects of Cooling Rate on Hardness Change of a Pd-Au-Ag-Sn Metal-Ceramic Alloy During Porcelain Firing Simulation
김민정, 신혜정, 권용훈, 김형일, 설효정,
소속 상세정보
김민정 ( Kim Min-Jung ) - 부산대학교 치의학전문대학원 치과재료학교실
신혜정 ( Shin Hye-Jung ) - 부산대학교 치의학전문대학원 치과재료학교실
권용훈 ( Kwon Yong-Hoon ) - 부산대학교 치의학전문대학원 치과재료학교실
김형일 ( Kim Hyung-Il ) - 부산대학교 치의학전문대학원 치과재료학교실
설효정 ( Seol Hyo-Joung ) - 부산대학교 치의학전문대학원 치과재료학교실
KMID : 1035320160430030273
Abstract
Effects of cooling rate on change in hardness of a Pd-Au-Ag-Sn metal-ceramic alloy during porcelain firing simulation were examined by observing the change in hardness, crystal structure, and microstructure. Precipitation in the grain and grain boundaries which occurred during cooling after porcelain firing process resulted in hardening of the alloy. The most effective cooling rate for hardening of the alloy was stage 3, which was relatively slow cooling rate. By cooling at different cooling rates after the first firing process, oxidation, the hardness of alloy became apparently different. By further firing simulation, the hardness of alloy decreased constantly at each cooling rate. Such a softening during porcelain firing process resulted from the microstructural coarsening of the precipitates which formed in the grain interior and boundaries.
키워드
Pd-Au-Ag-Sn alloy; Firing simulation; Precipitation harding; Cooling rate
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