반복주조가 Pd-Ag-Au 도재용 합금의 경도에 미치는 영향
Effects of repeated casting on hardness of a Pd-Ag-Au metal-ceramic alloy
조미향, 이광영, 조수연,
소속 상세정보
조미향 ( Cho Mi-Hyang ) - 원광보건대학 치기공과
이광영 ( Lee Gwang-Young ) - 원광보건대학교 치기공과
조수연 ( Cho Su-Yoen ) - 부산대학교 치의학전문대학원 치과재료학교실
KMID : 1035320150420040327
Abstract
Dental alloy manufacturers advise against the reuse of previously melted alloy. However, for economic and environmental reasons, dental laboratories often reuse the casting surplus. The purpose of present study is to find out the reason in hardness change of a Pd-Ag-Au-In-Sn metal-ceramic alloy by recasting. Hardness decreased with increase in casting frequency. At the same time, the microstructure of all recasted specimen showed complex microstructural features. The recasted specimens were composed of the matrix and the particle-like structures covered with fine precipitates. The decrease in hardness by recasting was caused by the decrease of nuclei concentration by repeated melting and resultant increase in grain size. The precipitates covered with the particle-like structures showed no microstructural change by the repeated casting up to 5 times. It was indicated that the precipitates were not related to the change in hardness by recasting.
키워드
Pd-Ag-Au-In-Sn alloy; recasting; grain growth; hardness
원문 및 링크아웃 정보
등재저널 정보