| 摘要 |
PURPOSE: A dental precious metal alloy for metal-ceramic crown is provided to secure price competitiveness, improve mechanical properties, solve demerits of a large amount of Pd added and improve color of the alloy by reducing expensive Pt and Pd and adding small amounts of Ta and Mn, and a method for manufacturing the same is provided. CONSTITUTION: In a manufacturing method of an alloy composition for dental metal-ceramic crown comprising the steps of charging the alloy composition for dental metal-ceramic crown consisting of Au, Pt, Pd, Ag, In, Ir, Ta and Mn into vacuum induction furnace, creating a vacuum atmosphere to 10¬-3 torr in the vacuum induction furnace and injecting an inert gas (argon) of about 50 torr into the vacuum induction furnace so that the alloy composition for dental metal-ceramic crown is melted; heat treating the molten metal in the mold by injecting melting completed molten metal into a precision casting graphite mold installed in chamber of the vacuum induction furnace under the vacuum state; stretching the heat treated cast article using a rolling mill; and manufacturing a final product by marking and cutting the stretched cast article, the method for manufacturing dental precious metal alloy for metal-ceramic crown is characterized in that the Ta is added to the alloy composition in a type of Pt-Ta master alloy comprising 95 wt.% of Pt and 5 wt.% of Ta so that the Ta added alloy composition is injected into the vacuum induction furnace.
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