Ohno Hiroki, Endo Kazuhiko, Haneda Katsumi, Tamura Makoto, Hikita Kazuhiro
Department of Dental Materials Science, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Japan.
Dent Mater J. 2005 Dec;24(4):503-7. doi: 10.4012/dmj.24.503.
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.
含铜量为10质量%、20%和30%的金合金用于在空气中800摄氏度加热后酸洗的多孔表面结构的形态观察。随着金合金中铜含量的增加，合金基体中的内氧化区发育良好。仅以铜作为母材的金合金表面形成多孔结构的机制被认为如下：沿晶界形成的Cu2O作为扩散路径，允许O2-渗透到合金内部基体中，从而导致主要沿晶界发生内氧化。
