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KMID : 0362220130400010007
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Journal of The Korean Research Society for Dental Materials
2013 Volume.40 No. 1 p.7 ~ p.14
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Effects of alloying elements on age-hardenability of Au-Cu-Zn alloys at intra-oral temperature
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Seol Hyo-Joung
Cho Su-Yoen
Lee Gwang-Young
Jeong Ji-In
Pyo Ae-Ri
Kwon Yong-Hoon
Kim Hyung-Il
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Abstract
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In the present study, the age-hardenability at intra-oral temperature of various Au-Cu-Zn alloys containing Ga, Ti, Sn, Cr was evaluated by means of hardness test and X-ray diffraction (XRD) study after solution-treatment at various temperatures and then aging at intra-oral temperature. By the addition of Ti and Sn, the age-hardenability at intra-oral temperature of Au-Cu-Zn alloys decreased apparently.And by the addition of Ga and Cr, the apparent age-hardenability at intra-oral temperature of Au-Cu-Zn alloys was preserved. In Cr-added Au-Cu-Zn alloys, the reduction of Cu content rather than Zn content was much more effective for preserving the age-hardenability at intra-oral temperature. The apparent age-hardenability at intra-oral temperature of Ga- or Cr-added Au-Cu-Zn alloys attributed to the formation of the AuCu II ordered phase. In the Au-Cu-Zn alloys containing Cr, the increased Cr content did not prevent the formation of AuCu II ordered phase at intra-oral temperature, but possibly reduced the driving force for the formation of AuCu II ordered phase at intra-oral temperature. If Ga- or Cr-added Au-Cu-Zn alloy having apparent age-hardenability at intra-oral temperature is used as a dental alloy, it will become harder in the oral cavity without additional heat-treatment.
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KEYWORD
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Age-hardenability, Intra-oral temperature, AuCu II, Au-Cu-Zn-Cr, Au-Cu-Zn-Ga
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