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Journal of Dental Research
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Oxidation and Ceramic Coatings on 80Ni20Cr Alloys

J.A. Pask

Department of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720

A.P. Tomsia

Department of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720

Additives and/or impurities in NiCr alloys would be expected to affect the oxidation and adherence of dental glasses. Oxidation characteristics and bonding of several glasses to a commercial impure 80Ni20Cr alloy and laboratory-prepared purer alloys were thus studied at 1000°C. The commercial alloy formed a porous and buckled single-layer oxide scale with lenticular voids at the interface. The scale was penetrated by glass which formed a chemical bond at the alloylglass interface, resulting in excellent adherence with fracture in the glassy phase. The purer alloy formed a complex multilayer oxide scale to which the glass bonded but did not penetrate; the assembly was not satisfactory, since fracture occurred in the oxide scale.

Journal of Dental Research, Vol. 67, No. 9, 1164-1171 (1988)
DOI: 10.1177/00220345880670090501
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