耐火模型用マグネシア系コーティング材が純チタン鋳造体反応層に与える影響

概要

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Magnesia coating materials for refractory models were produced to improve a reactive layer of the pure titanium denture base cast using phosphate-bonded investment, and various properties of coating samples using the coating refractory models were compared with those of control samples made by a conventional investing method. The results were as follows: A small residual investment was observed on the coating samples removed from the mold. The surface roughness of coating samples was greater than that of control samples. The hardness of coating samples was lower than that of control samples in the depth range from the surface to about 45μm. As for coating samples, the microstructure of the surface of the castings showed almost no evidence of a corroded zone, while that of control samples exhibited a layered structure of characteristic pure titanium castings. Use of an electron probe microanalyzer (EPMA) to determine distribution of various elements in the superficial layer of castings revealed a reduced reactive layer containing impurity elements in coating samples, and a reactive layer containing Si and P in control samples. These results suggested that it is possible to improve a reactive layer of pure titanium castings using phosphate-bonded investment by magnesia coating of the surface of the refractory models.
社団法人日本補綴歯科学会の論文
2000-04-10