Au-Pt-Pd계 금속-세라믹 합금의 모의소성 후 후열처리에 따른 석출경화
Precipitation hardening associated with post-firing heat treatment after simulated firing of an Au-Pt-Pd metal-ceramic alloy
김성민, 전병욱, 유영준, 권용훈, 김형일, 설효정,
소속 상세정보
김성민 ( Kim Sung-Min ) - 부산대학교 치의학전문대학원 치과재료학교실
전병욱 ( Jeon Byung-Wook ) - 부산대학교 치의학전문대학원 치과재료학교실
유영준 ( Yu Young-Jun ) - 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 : 1035320140410030171
Abstract
The precipitation hardening by post-firing heat treatment after simulated firing of an Au-Pt-Pd metal-ceramic alloy was examined by observing the change in hardness, crystal structure and microstructure. By post-firing heat treatment of a completely fired specimen at 650℃, the hardness increased rapidly within 10 minutes to the aximum value. The maximum hardness value was maintained until 40 minutes, then the hardness decreased gradually. The apparent hardening by post-firing heat treatment after simulated porcelain firing was attributed to the lattice strains which were formed by the grain interior- and grain boundary precipitates. The precipitated phase from the parent Au-rich α phase by the post-firing heat treatment after simulated firing was an AuCu3-type (Pt, Pd)3(In, Sn) phase with a lattice parameter of a220=3.9986 Å. From the above results, appropriate post-firing heat treatment in order to support the hardness of metal substructure of metal-ceramic prosthesis was expected to bring positive effects to durability of the prosthesis.
키워드
post-firing heat treatment; Au-Pt-Pd metal-ceramic alloy; simulated porcelain firing; grain interior precipitates; precipitation hardening
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