Au-Pt-Pd계 금속-세라믹 합금의 모의소성시 냉각속도와 소성단계가 경도와 미세구조에 미치는 영향
The effect of cooling rate and firing stage on the hardness and microstructure of the firing simulated Au-Pt-Pd metal-ceramic alloy
김성민, 전병욱, 권용훈, 김형일, 설효정,
소속 상세정보
김성민 ( Kim Sung-Min ) - 부산대학교 치의학전문대학원 치과재료학교실
전병욱 ( Jeon Byung-Wook ) - 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 : 1035320140410020139
Abstract
The effect of cooling rate and firing stage on the hardness and microstructure of the firing simulated Au-Pt-Pd metal-ceramic alloy was investigated by means of hardness test, field emission scanning electron microscopic observations, X-ray diffraction analysis. The effective cooling rate for hardening of alloy during simulated porcelain firing was quick cooling and stage 0, and the hardening effect became weak as the cooling rate became slower than stage 0. The hardness of the firing simulated specimen until final glazing stage was slightly lower than that of only glazing treated specimen. Thus, repetitive firing decreased the hardness of the Au-Pt-Pd metal-ceramic alloy. By oxidation treatment which is the first firing stage, the formation of fine grain interior precipitates was observed, which resulted in apparent hardening by severe lattice distortion. By repetitive firing or by reducing the cooling speed, the grain interior precipitates became coarse, which resulted in softening of the Au-Pt-Pd metal-ceramic alloy.
키워드
cooling rate; Au-Pt-Pd metal-ceramic alloy; simulated porcelain firing cycle; grain interior precipitates; hardening
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