Strandman E
Odontol Revy. 1976;27(3):223-38.
The influence of different acetylene-oxygen flames on the carbon content of a dental cobalt-chromium alloy, type A, was studied under standardised casting conditions. The alloy was cast, both immediately after the formation of the Bull's eye and after prolonging the melting time. Further, the effect of re-casting, varying the amount of alloy casted and using different sections of the same acetylene-oxygen flame when melting was studied. The results showed on the one hand that the chemical character of the section of flame used and not the gasmixture as such determined the carbon content of the casting, and on the other that the acetylene-oxygen flames can increase but not decrease the carbon content in the casting. Increase of the carbon content of a cobalt-chromium alloy causes a considerable change in its microstructure.
在标准化铸造条件下，研究了不同乙炔-氧气火焰对A型牙科钴铬合金碳含量的影响。在形成“靶心”后立即铸造该合金，并延长熔化时间后再进行铸造。此外，还研究了重新铸造的效果、改变铸造合金的量以及在熔化时使用同一乙炔-氧气火焰的不同部分的影响。结果一方面表明，所用火焰部分的化学特性而非气体混合物本身决定了铸件的碳含量，另一方面表明乙炔-氧气火焰会增加但不会降低铸件中的碳含量。钴铬合金碳含量的增加会使其微观结构发生显著变化。
