| 摘要 |
A crucible includes a hollow main body defining an opening, a heat body, and a cover. The heat body is received in and connected with the main body. The heat body includes a heat end extending out of the main body through the opening. The heat end can be heated by an electro-beam. The cover is supported by the main body and covers the opening and defines a center hole and a number of gas holes. The heat end passes through the center hole. The main body, the heat body, and the cover are made of thermal conductive refractory material.
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