은이 함유되어 있지 않은 Pd-Cu-In-Ga계 도재용 합금의 모의소성과 계류에 따른 석출경화
Precipitation hardening by simulated complete firing and holding condition in a silver-free metal-ceramic alloy of Pd-Cu-In-Ga sysem
전병욱, 김성민, 권용훈, 김형일, 설효정,
소속 상세정보
전병욱 ( Jeon Byung-Wook ) - 부산대학교 치의학전문대학원 치과재료학교실
김성민 ( Kim Sung-Min ) - 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 : 1035320140410010077
Abstract
Precipitation hardening by simulated complete firing and holding condition in a silver-free metal-ceramic alloy of Pd-Cu-In-Ga system was investigated by means of hardness test, field emission scanning electron microscopic observations, X-ray diffraction analysis and energy dispersive X-ray spectrometer analysis. Most effective condition for hardening of alloy was obtained at cooling rate of stage 1 (firing chamber opens about 70 mm) and starting temperature of 600℃. After simulated degassing treatment, the hardness value of solution treated specimen decreased by about 20 Hv, and during the simulated complete firing cycle, such a low hardness value was maintained. By holding the specimen at 600℃ and 700℃ after simulated complete firing, the hardness increased apparently. However, the decrease in hardness by overaging occurred within 30 min at the holding temperature of 700℃. The age-hardening of a silver-free Pd-Cu-In-Ga alloy resulted from precipitation of the CuPd phase containing Ga and In from the Pd-rich matrix.
키워드
Precipitation hardening; Holding condition; Simulated firing cycle; Silver-free Pd-Cu-In-Ga; Metal-ceramic alloy
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