铼酸铵及铼粉制备工艺中碳杂质遗传行为研究

本文的研究目的是探索铼酸铵及铼粉中杂质元素尤其是碳元素的遗传行为。研究方式采用扫描电镜微观组织分析和GDMS化学成分检测进行材料中杂质元素含量分析。另外采用ThermoCalc热力学计算方法对碳杂质的气化行为进行了理论分析，辅助解释杂质去除机理。结果表明，铼酸铵溶液中通入臭氧可以提高铼酸铵纯度、降低碳含量。铼酸铵氢还原制备铼粉时，粉末碳含量没有发生本质变化。在等离子球化工艺中，低熔点金属杂质、碳杂质的含量均得到降低。通过最终的等离子球化除杂，铼粉纯度达到99.995%级，碳含量＜0.001%。

Study on the genetic behavior of carbon impurity in synthesis processes of ammonium rhenate and rhenium powders

The aim of this study is to research the genetic behavior of impurity elements especially carbon in ammonium rhenate and rhenium powders. The research methods include SEM microstructure analyses and GDMS chemical composition measurement of the impurity elements in materials. By applying ThermoCalc calculation method, the gasification behavior of carbon in the processes was also analyzed helping to explain the mechanism of impurity removing. The results showed that the injection of ozone gas into solution can improve the purity especially carbon of the ammonium rhenate. During the reduction of ammonium rhenate to rhenium, carbon content in the powders was not much changed. But, in the plasma sphero process, the amount of low-melting-point impurities and carbon was decreased. The composition testing indicated that the purity of the rhenium powder reach 99.995%, the carbon content was <0.001% after the plasma sphero cleaning process.