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KMID : 0362220130400010033
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Journal of The Korean Research Society for Dental Materials
2013 Volume.40 No. 1 p.33 ~ p.40
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The effect of simulated firing cycle on age-hardenability of Au-Cu-Zn alloy containing Cr at intraoral temperature
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Seol Hyo-Joung
Cho Su-Yoen
Lee Gwang-Young
Jeong Ji-In
Jeon Byung-Wook
Kwon Yong-Hoon
Kim Hyung-Il
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Abstract
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In the present study, the effect of simulated firing cycle on age-hardenability of Au-Cu-Zn alloy containing Cr at intraoral temperature was evaluated by means of hardness test, X-ray diffraction (XRD) study, scanning electron microscopic (SEM) observation, electron probe micro analysis (EPMA) and differential thermal analysis (DTA) after solution-treatment and then aging at intraoral temperature after simulated firing cycle. The Au-Cu-Zn alloy containing 10-15 at.% Cr was softened during simulated firing, and was hardened during cooling process after simulated firing. The hardening effect during cooling process of the Au-Cu-Zn alloy containing 10-15 at.% Cr after simulated firing cycle decreased apparently by the repetitive firing. The Cr addition up to 15 at.% instead of Cu in AuCu-20Zn (at.%) alloy did not result in appreciable change of the order-disorder transition temperature and solidus temperature. The age-hardenability at intraoral temperature of Au-Cu-Zn alloy containing 10-15 at.% Cr decreased apparently after solution-treatment and then simulated firing and aging at intraoral temperature.
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KEYWORD
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Age-hardenability at intraoral temperature, simulated firing cycle, multi-purpose, Au-Cu-Zn-Cr
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