Ag-Pd-In계 도재용 합금의 모의소성 조건에 따른 경도변화
Hardness Change by Simulated Firing Condition in an Ag-Pd-In Metal-ceramic Alloy
전병욱, 이광영, 권용훈, 김형일, 설효정,
소속 상세정보
전병욱 ( Jeon Byung-Wook ) - 부산대학교 치의학전문대학원 치과재료학교실
이광영 ( Lee Gwang-Young ) - 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 : 0362220130400030185
Abstract
Hardness change by simulated complete firing cycle and holding condition in an Ag-Pd-In metalceramic alloy was elucidated by characterizing the changes in hardness, microstructure and crystal structure after simulated complete firing with various cooling rates (ice quenching, quick cooling, stages 0, 1, 2 and 3) and holding conditions to identify the most effective condition for practical use. The maximum hardness value was obtained at stage 0 after simulated firing. And the most effective starting temperature for firing was 550 ℃. The Vickers hardness value of the solution-treated specimen increased from 185 (Hv) to 254 (Hv) by degassing treatment. The hardness increase in the degassing stage of the simulated firing seemed to be caused by the lattice distortion which is related to the precipitation in the alloy. After that, by the repetitive firing, the hardness value of the tested alloy decreased gradually, resulting in a softening effect. By holding the specimen at 450-600 ℃ after simulated firing, the hardness increased apparently. The most effective holding condition were obtained at 600 ℃ for 15 min. Therefore, holding treatment at 600 ℃ for 15 min after simulated complete firing is recommended to improve hardness of the Ag-Pd-In metal-ceramic alloy.
키워드
Simulated firing cycle; cooling rate; metal-ceramic alloy; Ag-Pd-In
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