双色球红蓝走势图

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如何提升石墨坩埚的抗氧化效果?

发布时间:2019-07-17 09:59:37 浏览:167次

石墨坩埚放入炉内,最好是等本身红透,先放一点小型的碎金属料在坩埚底,再放金属锭(金属锭下埚前必需放在炉沿边上烘烤),以免冷锭直接放进埚里,形成坩埚遇冷而炸裂。而且还必需保证这些资料在坩埚中受热时有足够的收缩空间,否则坩埚容易被挤裂。

如何提升石墨坩埚的抗氧化效果?

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