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Isothermal Age-hardening Behavior in the Commercial Dental Au-Ag-Cu-Pd Alloy
김형일,장명익,이유식,Kim, Hyung-Il,Jang, Myoung-Ik,Lee, You-Sik The Korea Society of Medical and Biological Engine 1996 의공학회지 Vol.17 No.2
The relationship between the isothermal age-hardening behavior and the phase transformation in the commercial dental Au-Ag-Cu-Pd alloy was investigated Age-hardening was mostly attributed to the lattice distortions of the supersaturated w phase resulting from the transformation to the metastable phasel which were more distinct at lower aging temperature. The lattice distortions resulting from the transformation of the metastable phases to the equilibrium phases also made a contribution to the age-hardening.
黃辰淵,張明翊 부산대학교 기초과학연구소 1994 부산대학교 기초과학연구소 연구논문집 Vol.14 No.-
The various weathering products derived from andesitic rocks in the Guweol mountain area of Pusan have been studied in order to investigate the occurrence, characteristics and evolutional trend of clay minerals in the weathered rock and soil using mainly X-ray powder diffraction method. Kaolinite and halloysite are very abundant in the weathered rocks and soils derived from andersitic rocks of this area. Also, 12Å-and 14Å-minerals occur in the considerable amount. 12Å-minerals have been identified as mica/vermiculite interlayer minerals showing the 25Å basal reflection. Their crystal sizes are relatively big showing more than 10 micron in diameter. Two types of 14Å-mineral, which are vermiculite/smectite interlayer mineral and A1-vermiculite, have been observed. Kaolin minerals consist of kaolinite, 10Å and 7Å halloysite. Kaolinite relatively dominates in the strongly weathered soil of the area. In contrast with kaolinite, 12Å-and 14Å-minerals such as vermiculite/smectite and mica/vermiculite interlayer minerals tend to occur in the weakly to intermediately weathered products, Based on their occurrences, it strongly suggests that they are intermediate products in the course of the weathering process from the parent materials into the kaolin mineral.
김형일,장명익,심지영 大韓齒科器材學會 1995 대한치과재료학회지 Vol.22 No.1
The proper temperatures of heat treatment in a commercial low-gold dental casting alloy were studied by means of DTA, hardness test, X-ray diffraction study. The results were as follows : 1) The effect of age-hardening was apparent at the higher solution-treatment temperature. 2) The stable phase was the co-existence of the Ag-rich α₁phase and the AuCu I ordered phase at the temperature of the effective age-hardening. 3) The suitable temperatures for the solution treatment and the aging were 800℃, 400℃, respectively.
김형일,김영근,장명익,김교한 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1
The relationship between the isothermal age-hardening behavior and the phase transformation process in a dental casting Au-Ag-Cu-Pd alloy was investigated by means of hardness test, X-ray diffraction study. 1. The isothermal age-hardening behavior in the 350∼450℃ temperature range showed a similar tendency in the changes. However, the initial hardening was faster and the maximum hardness was higher and the overaging with softening was slower on aging at the lower temperature. 2. By the isothermal aging at 350∼450℃, the metastable Ag-rica α₁’and AuCu Ⅰ’orderd phases were formed from the supersaturated α phase prior to the final formation of the equilibrium Ag-rich α₁’and AuCu Ⅰordered phases. 3. By aging at 450℃, the age-hardening was attributed to the lattice strains of the parent phases resulting from the transformation of the αphase resulting from the transformation to the metastable phases. The X-ray diffraction peaks of the αphase showed a distinct shift toward both the high and low diffraction angles during transformation.
김형일,김종렬,안호경,장명익,설효정,김교한 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.2
The age-hardening behavior of a commercial dental casting low-carat gold alloy was investigated by means of differential thermal analysis, hardness test, optical microscopic observation and X-ray diffraction study. The following results were obtained. 1. By the isothermal aging of this alloy at 300∼400℃, the hardness increased markedly at the initial stage and continued to increased gradually for the time, and then decreased dractically after longer aging time. 2. The hardening was attributed to the formation of the metastable AuCu I' ordered phase from the α matrix. 3. The overaging with softening was attributed to the precipitation of the fine lamellar structure which was composed of the Ag-rich α1 and AuCu I ordered phases.