坩埚损坏分析(The possible reason for the crucible damaging )
裂纹
① 将常温状态下的坩埚直接放入高温中，或者直接快速加热。
② 硬物撞击造成。
③ 坩埚内积累了太多的炉渣。
④ 金属液体没有清理干净，加热后胀破。
⑤ 火焰控制不好，坩埚加热时受热不均匀，上下温度差大。
⑥ 坩埚钳夹取的位置过于靠上，用力过大。
⑦ 炉沿盖压得太紧或者坩埚上沿氧化严重。
⑧ 将料锭 横向放入坩埚内，没有足够的膨胀 空间，胀破坩埚。
⑨ 将热坩埚放在冷地面上，或者坩埚底座太小，不平整。
Cracking
① The crucible was not preheated or heated up too fast.
② The crucible was impacted by hard goods.
③ Too much slag left in the crucible.
④ The crucible was broken up by the melting metal left.
⑤ Uneven heating as a result of the bad flame controlling,which lead to much temperature difference between the top and the bottom for the crucible.
⑥ The contact position of the crucible and the crucible clamp was not proper or the force the between them was too big.
⑦ Too tighten for the furnace lid on the crucible or the crucible top oxidized seriously.
⑧ No enough space left when the ingot was putted into the crucible transversely.
⑨ The heated crucible was put on the cool base directly or the base was too small and irregular.
破洞和小孔
① 硬物撞击造成，例如料锭扔入坩埚内或者清理坩埚时硬物冲击造成。
② 溶剂直接加入到坩埚内壁上。
③ 烘烤产生微小裂纹造成。
The broken hole and eye
① Impacted by the hard materials.For example,impacted by the hard materials during the cleaning process or the ingot was throwing into the crucible.
② The crucible inwall was covered by the solvent.
③ The appearance of the microcrack during the baking process.
腐蚀
① 熔剂加入量，还有就是熔剂必须在金属熔化后加入。
② 使用劣质焦炭或者炉渣所引起。
③ 加入强腐蚀行性的添加剂。
Corrosion
① The solvent mass or it was added into the crucible before the metal melting.
② Coke oof poor quality or the slag.
③ Addition of highly corrosivesolvent.

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