title: Mechanism by which porous structure is formed on the surface of gold alloy containing only Cu as base metal.
abstract: Gold alloys with Cu contents of 10 mass%, 20%, and 30% were used for morphological observation of porous surface structures after heating at 800 degrees C in air followed by pickling with acid solution. With increasing Cu content in the gold alloy, the internal oxidation zone became well-developed in the alloy matrix. The mechanism by which a porous structure was formed on the surface of a gold alloy containing only Cu as a base metal was thought to be as follows: Cu2O which formed along the grain boundaries acted as a diffusion path, permitting the penetration of O2- into the inner alloy matrix, and thereby resulting in internal oxidation occurring predominantly along the grain boundaries.
authors.affiliation: Department of Dental Materials Science, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Japan. ohno@hoku-iryo-u.ac.jp
authors.forename: Hiroki
authors.initials: H
authors.lastname: Ohno
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Endo
authors.forename: Katsumi
authors.initials: K
authors.lastname: Haneda
authors.forename: Makoto
authors.initials: M
authors.lastname: Tamura
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Hikita
mesh_terms: D003300:Copper; D001840:Dental Bonding; D006047:Gold Alloys / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D016062:Porosity; D019279:Resin Cements; D013499:Surface Properties
chemical_list: D006047:Gold Alloys; D019279:Resin Cements; D003300:Copper