一、坩埚放进炉内，是等本身红透，先放一点中小型的金属边料在坩埚底，再放金属锭(金属锭下埚前务必放到炉大通道上烤制)，以防冷锭立即放入埚里，导致坩埚受冷而爆裂。并且还务必确保这种原材料在石墨坩埚中遇热时有充足的澎涨室内空间，不然坩埚非常容易被挤裂。

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