Pd-Au-Ag계 금속-도재용 합금의 degassing 후 냉각 속도와 추가 열처리에 따른 경화 기전
Hardening mechanism associated with additional heat treatment after degassing treatment by various cooling rates in a metal-ceramic alloy of Pd-Au-Ag system
김성민, 유영준, 조미향, 권용훈, 설효정, 김형일,
소속 상세정보
김성민 ( Kim Sung-Min ) - 부산대학교 치의학전문대학원 치과재료학교실
유영준 ( Yu Young-Jun ) - 부산대학교 치의학전문대학원 치과재료학교실
조미향 ( Cho Mi-Hyang ) - 원광보건대학 치기공과
권용훈 ( Kwon Yong-Hoon ) - 부산대학교 치의학전문대학원 치과재료학교실
설효정 ( Seol Hyo-Joung ) - 부산대학교 치의학전문대학원 치과재료학교실
김형일 ( Kim Hyung-Il ) - 부산대학교 치의학전문대학원 치과재료학교실
KMID : 1035320150420040271
Abstract
Hardening mechanism associated with additional heat treatment after degassing treatment by various cooling rates in a metal-ceramic alloy of Pd-Au-Ag system was investigated. For this, surface hardness test, field emission scanning electron microscopic observations, X-ray diffraction analysis and energy dispersive X-ray spectrometer analysis were conducted. From the results of surface hardness changes during cooling specimen at various cooling rates after degassing treatment, the lowest hardness value which was obtained in the ice quenched specimen was caused by homogenization during degassing treatment. Precipitation hardening occurred effectively at slow cooling rate (stages 2, 3) after degassing treatment. In the ice quenched specimen after degassing treatment, hardening occurred remarkably by precipitation during additional heat treatment. However, increase in surface hardness by additional heat treatment did not occur in the specimen which was cooled by controlled cooling rate after degassing treatment.
키워드
Pd-Au-Ag alloy; Hardening Mechanism; Heat Treatment; Cooling rate; Precipitates
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