승온소둔법에 따른 치과주조용 금합금의 상변태
Phase Transformation of a Dental Casting Gold Alloy during Anisothermal Annealing
소속 상세정보
이경희/Kyung Hee Lee
이종호/이희경/김형일/久恒邦博/타間康子/薛曉瀞/Jong Ho Lee/Hee Kyung Lee/Hyung Il Kim/Kunihiro Hisatsune/Yasuko Takuma/Hyo Joung Seol
KMID : 0362220000270030217
Abstract
시판 치과주조용 금합금(74.0wt% Au-13.5wt% Ag-7.0wt% Cu-2.4wt% Pt-2.0wt% Pd-1.0wt% Zn-0.1wt% Ir)의 승온소둔법에 따른 상변태를 전기저항측정, 투과전자현미경 관찰, 제한시야 전자회절 분석, X선회절 실험으로 조사하여, 다음과 같은 결과를 얻었다. 1.
전이온도인
680℃ 이상에서 용체화처리된 실험합금을 승온소둔함에 따라 260~430℃에서 뚜렷한 전기저항의 감소가 나타났다. 2. 전기저항의 감소는 AuCu Ⅰ 형 규칙격자의 생성에 기인하였다. 3. 온도의 상승에 따라, 규칙상 구조가 3 variant로 형성되고 기지의 {100} 면에
판상으로
성장하였다.
Phase transformation during continuous heating after quenching of a commercial dental casting gold alloy(74.0wt% Au-13.5wt% Ag-7.0wt% Cu-2.4wt% Pt-2.0wt% Pd-1.0wt% Zn-0.1wt% Ir) was investigated by means of electrical resistivity measurements,
transmission electron microscopic observations, selected-area electron diffraction analysis and X-ray diffraction study. The following results were obtained. 1. The gold alloy showed remarkable decrease in electrical resistivity between 260℃ and
430℃
during anisothermal annealing after quenching from above critical temperature, 680℃. 2. The decrease in electrical resistivity corresponded to the formation of the AuCu Ⅰ type ordered phase. 3. The ordered structure with three variants was
formed
and
developed into platelets on {100} planes of the matrix with increasing the temperature.
키워드
Anisothermal annealing; Gold alloy; Phase transformation; Selected-area electron diffraction;
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