title: Oxidation and ceramic coatings on 80Ni20Cr alloys.
abstract: 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 degrees 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 alloy/glass 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.
mesh_terms: D000268:Adhesiveness; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002858:Chromium Alloys; D001840:Dental Bonding; D003776:Dental Porcelain; D010084:Oxidation-Reduction; D013499:Surface Properties
chemical_list: D002858:Chromium Alloys; D003776:Dental Porcelain