| 摘要 |
PURPOSE:To provide excellent wear resistance, corrosion resistance and toughness to the titled alloy and to improve the castability thereof by incorporating specific amounts of C, Si, Mn, Cr, Mo, Hf and B into the Ni based alloy. CONSTITUTION:The compsn. of the Ni based cast alloy for dentistry consists of, by weight, 0.01-0.6% C, 0.1-5% Si, 0.1-3% Mn, 20-37% Cr, 1-20% Mo, 0.005-6% Hf, 0.0001-0.5% B and the balance Ni with inevitable impurities. 0.1-10% W and one or more kinds among 0.1-12% Ti, Nb and Ta are furthermore incorporated into the alloy at need. The alloy is prepd. by using a conventional high-frequency melting furnace and is cast by using a sand mold, etc. Since said cast alloy has high strength, high hardness and high toughness equal to or above the conventional Ni-Cr based alloy and has excellent castability, the cast having a complicated shape can soundly be produced with a fine cast case.
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