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The Structure of Oxide Formed by High-temperature Oxidation of Commercial Gold Alloys for Porcelain-Metal Bonding

Department of Dental Materials and Technology, School of Dentistry, Niigata University, Niigata, Japan

O. Miyakawa

Department of Dental Materials and Technology, School of Dentistry, Niigata University, Niigata, Japan

K. Watanabe

Department of Dental Materials and Technology, School of Dentistry, Niigata University, Niigata, Japan

N. Shiokawa

Department of Dental Materials and Technology, School of Dentistry, Niigata University, Niigata, Japan

For gold alloys containing only In as a base metal, an external In₂O₃ layer forms uniformly on the alloy surface. However, when the alloy contains Sn and In, no external oxide layer can be detected by electron probe micro-analysis, and oxide particles composed of In₂O₃ and SnO₂ precipitate in the alloy. For alloys containing Ni, in addition to In and Sn, the external oxide is composed of NiO; there is little development of internal oxide. For alloys containing Fe and Sn, an oxide layer of only Fe₂O₃ forms on the alloy surface, and the internal oxidation zone shows a band-like structure containing SnO₂ and a small amount of Fe₂O₃.

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Journal of Dental Research, Vol. 61, No. 11, 1255-1261 (1982)
DOI: 10.1177/00220345820610111001


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This article has been cited by other articles:

				H. Ohno and Y. Kanzawa Structural Changes in the Oxidation Zones of Gold Alloys for Porcelain Bonding Containing Small Amounts of Fe and Sn Journal of Dental Research, January 1, 1985; 64(1): 67 - 73. [Abstract] [PDF]

				H. Ohno, Y. Kanzawa, I. Kawashima, and N. Shiokawa Structure of High-temperature Oxidation Zones of Gold Alloys for Metal-Porcelain Bonding Containing Small Amounts of In and Sn Journal of Dental Research, June 1, 1983; 62(6): 774 - 779. [Abstract] [PDF]

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