연화 열처리 후 모의소성된 금속-세라믹용 Pd-Ag-Au계 합금의 후열처리에 의한 경화기전
Hardening mechanism associated with post-firing heat treatment of softening heat treated and then firing simulated Pd-Ag-Au alloy for bonding porcelain
김성민, 유영준, 조미향, 권용훈, 김형일, 설효정,
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
김형일 ( Kim Hyung-Il ) - 부산대학교 치의학전문대학원 치과재료학교실
설효정 ( Seol Hyo-Joung ) - 부산대학교 치의학전문대학원 치과재료학교실
KMID : 1035320150420020095
Abstract
Hardening mechanism associated with post-firing heat treatment of softening heat treated and then firing simulated Pd-Ag-Au alloy for bonding porcelain was examined by observing the change in hardness, crystal structure and microstructure. By post-firing heat treatment of as-cast, solution treated and pre-firing heat treated specimens at 650 ℃ after casting, the hardness value increased within 10 minutes. Then, hardness consistently increased until 30 minutes, and gap of hardness value among the specimens was reduced. The increase in hardness after post-firing heat treatment was caused by grain interior precipitation in the matrix. The softening heat treatment did not affect the increase in hardness by post-firing heat treatment. The precipitated phase from the parent Pd-Ag-Au-rich α phase with face-centered cubic structure by post-firing heat treatment was Pd3(Sn, In) phase with face-centered tetragonal structure, which has lattice parameters of a200=4.0907 Å, c002=3.745 Å. From above results, appropriate post-firing heat treatment in order to support the hardness of Pd-Ag-Au metal substructure was expected to bring positive effects to durability of the prosthesis.
키워드
Pd-Ag-Au alloy; Post-firing heat treatment; Simulated complete firing; Grain interior precipitates; Hardening
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