Nasu T, Hikichi H, Noguchi H
Shika Rikogaku Zasshi. 1978 Jan;19(45):39-47.
We studied about castability and microporosity of cobalt-chromium-nickel alloy for dental casting in various methods of fusion and casting. The combinations of fusion and casting were induction fusion and centrifugal casting, arc discharge fusion and argon gas pressure casting and oxy-acetylene flame fusion and centrifugal casting. The following results were obtained. 1. The amount of microposity was smaller, when only mold temperature was low, and as mold temperature and casting temperature were high, castability was better. 2. The arc discharge fusion and argon gas pressure casting was the best method about castability and microporosity in three methods. Second method was the induction fusion and centrifugal casting. 3. In the induction fusion and centrifugal casting, blowing arong gas of 1 l/min to molten metal to protect the metal from oxidization improved the castability the best, but amount of microporosity was large, so that it was needed to lower the mold temperature in this condition. 4. The oxyacetylene flame fusion and centrifugal casting was not suitable for the casting of Co-Cr alloy "Regalloy No. 3", for the alloy was made for the induction fusion casting.
我们研究了牙科铸造用钴铬镍合金在各种熔化和铸造方法下的可铸性和微孔率。熔化和铸造的组合包括感应熔化和离心铸造、电弧放电熔化和氩气压力铸造以及氧乙炔火焰熔化和离心铸造。得到了以下结果。1. 仅模具温度较低时，微孔数量较少，且随着模具温度和铸造温度升高，可铸性更好。2. 在三种方法中，电弧放电熔化和氩气压力铸造在可铸性和微孔率方面是最佳方法。第二种方法是感应熔化和离心铸造。3. 在感应熔化和离心铸造中，以1升/分钟的流量向熔融金属吹入氩气以防止金属氧化，可铸性改善最佳，但微孔数量较多，因此在此条件下需要降低模具温度。4. 氧乙炔火焰熔化和离心铸造不适合铸造钴铬合金“Regalloy No. 3”，因为该合金是为感应熔化铸造而制造的。
