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等离子体电弧熔炼法对金属铽中碳含量的影响

DOI: 10.13336/j.1003-6520.hve.2015.09.015, PP. 2925-2929

Keywords: 等离子体电弧熔炼,氢等离子体,高纯化,,,化学反应热力学

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Abstract:

高纯铽金属是镧系金属中应用较为广泛的重稀土元素,其中碳元素是金属提纯过程中较难脱除的小分子杂质元素之一。固溶的间隙杂质会对材料的物理化学性能产生不利影响。为此通过等离子体电弧熔炼技术对商用铽金属进行高温熔炼,采用红外测试技术标定熔炼前后金属中的碳含量。实验结果表明高温等离子体可以脱出基体金属中残留的微量碳成分,并且不同等离子体氛围、熔炼时间及电流强度对铽金属中脱碳行为都有不同影响;其中,氢等离子体表现出更显著的脱碳效果,随着通入氢气量的增加金属中碳质量分数可降低至0.017085%。氢气在高温发生电离,激发态的氢等离子体具有极高化学反应活性,在熔炼脱碳过程中发挥了重要作用。氢等离子体的热导率极高,可以提高熔融金属表面温度,促进杂质挥发。

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