The possibility is established of reducing the sulfur content in cast nickel superalloys to less than 1 ppm (0.0001 wt.%) with addition to alloys of an increased amount of rare earth metals previously refined with alkaline-earth metals and filtered through a ceramic foam filter during casting. Use of mass spectrometry with a glow discharge makes it possible to develop a method for determining and ultralow sulfur content in nickel superalloys.

中文翻译：

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在真空熔炼过程中将复杂合金熔融镍从硫杂质中提炼到小于 1 ppm

确定了将铸造镍高温合金中的硫含量降低到低于 1 ppm (0.0001 wt.%) 的可能性，同时添加了更多稀土金属的合金，这些稀土金属先前用碱土金属精炼并通过陶瓷泡沫过滤器过滤在铸造过程中。使用辉光放电质谱法可以开发一种测定镍高温合金中超低硫含量的方法。