Abstract
Dental gold alloys with age-hardenability at intraoral temperature were developed. Either 3 or 6 at% Ga, Al, Zn, In, Ni or Pd were added to an equiatomic AuCu alloy and the effect of additives on the low-temperature age-hardenability was examined. Alloys containing Ga, Al or Zn exhibited excellent low-temperature age-hardenability. The hardness of an alloy containing 6 at% Ga or 6 at% Al was doubled in one to ten days by ageing at 37 °C. Pronounced hardening was not demonstrated in an as-cast alloy, but solution treatment for only a few minutes provided enough age-hardenability. The age-hardening rate at low temperature related closely with the melting temperature of the alloy. Experimental gold alloys exhibited electrochemical behaviour similar to that of a commercial Type IV gold alloy. It is therefore concluded that AuCu alloy with added Ga, Al or Zn is expected to have enough age-hardenability and corrosion resistance for clinical use in the oral environment.
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References
K. Yasuda andM. Ohta,J. Dent. Res. 61 (1982) 473.
M. Ohta, T. Shiraishi, M. Yamane andK. Yasuda,Dent. Mater. J. 2 (1983) 10.
T. Shiraishi andM. Ohta,J. Mater. Sci. 24 (1989) 1049.
M. Nakagawa, S. Matsuya andM. Ohta,J. Mater. Sci. Mater. Med. 3 (1992) 114.
M. Ohta, M. Nakagawa andK. Yasuda,J. Mater. Sci. 25 (1990) 5025.
Z. Marinkovic andV. Simic,Thin Solid Films 156 (1988) 105.
K. M. Entwistle andA. J. Perry,J. Inst. Metals 94 (1966) 24.
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Ohta, M., Shiraishi, T., Nakagawa, M. et al. Dental gold alloys with age-hardenability at intraoral temperature. J Mater Sci 29, 2083–2086 (1994). https://doi.org/10.1007/BF01154683
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DOI: https://doi.org/10.1007/BF01154683