| 摘要 |
A crucible includes a main body and a cover. The main body includes a first end surface, an opposite second end surface, a hollow part and a solid part. The hollow part and the solid part extend from the first end surface to the second end surface. The hollow part defines a receiving space. The first end surface defines an opening communicating with the receiving space, and includes a step positioned between the hollow part and the solid part. The solid part includes a heat end adjacent to the step. The heat end is heated by an electro-beam. The cover covers the opening, and defines a number of gas holes. The main body and the cover are made of thermal conductive refractory material.
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