用相变方法制取高纯度超细钽粉的研究

A Study of Manufacturing Ultra-Fine Grained and Highly pure Ta Powders by Phase Transformation

报导了通过相变热处理使Ｋ２ＴａＦ７晶体参数发生变化，以利于制取高纯度超细钽粉的实验依据和结果。结果表明，Ｋ２ＴａＦ７在２００～２５０℃发生可逆相变；相变后Ｋ２ＴａＦ７晶体的粒径可由原来的１３５１．８μｍ减小至７０．８μｍ，极大地提高了比表面积；相变后，杂质极大挥发，提高了Ｋ２ＴａＦ７的纯度。

method of manufacturing ultra-fine and high pure Ta powder has been investigated by using phase transformation. The results show that a adversable phase transformation occurs in tern perature range 200～250℃ for K2TaF7. A fier phase transformation, the size of K2TaF7 crystal can be reduced from 1351 .8 μm to 70.8 μm, and ratio surface area isextremely increased.