Mechanism by which Porous Structure is Formed on the Surface of Gold Alloy Containing Only Cu as Base Metal

概要

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Gold alloys with Cu contents of 10 mass%, 20%, and 30% were used for morphological observation of porous surface structures after heating at 800℃ 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 : Cu_2O which formed along the grain boundaries acted as a diffusion path, permitting the penetration of O^<2-> into the inner alloy matrix, and thereby resulting in internal oxidation occurring predominantly along the grain boundaries.
日本歯科理工学会の論文