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在高温下稀土金属有相当高的蒸汽压,而且经过高温活化的稀土金属吸收氢的能力增强。这给热抽取法,真空熔化法测氢带来了困难。本文介绍采用脉冲加热法,瞬间(5～15秒)将试样中氢提取出来,熔化的试样限制在石墨坩埚内,防止了挥发。由于提取手段的改进,使稀土合金中氢的测定得到了满意的结果,既不用特别的防挥发、防吸附手段又可在无浴料的条件下进行分析.灵敏度为0.9mV/lμg;相对标准偏差为9%。
Rare earth metals have a relatively high vapor pressure at elevated temperatures and the ability of rare earth metals activated at elevated temperatures to absorb hydrogen increases. This gives heat extraction method, vacuum melting method to bring hydrogen difficult. This article describes the use of pulse heating, instant (5 to 15 seconds) will be extracted from the hydrogen sample, the sample is limited to melting in the graphite crucible, to prevent evaporation. Due to the improvement of extraction methods, the determination of hydrogen in the rare earth alloy has obtained satisfactory results, and neither the special anti-volatilization nor the anti-adsorption method can be used for the analysis without the bath material with the sensitivity of 0.9mV / lμg; the relative standard Deviation of 9%.