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脉冲熔融-热导法测定钕铁硼中氮

Guangzhou Chemical Industry(2013)

Cited 23|Views12
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Abstract
钕铁硼中氮的单一测定没有标准方法和相应的参考物质,本文采用钢铁材料氮参考物质建立校准曲线,采用镍篮助熔和自动分析模式测定,建立了脉冲熔融-热导法测定钕铁硼中氮的分析方法。对比了坩埚类型、称样量、熔融功率、样品状态等分析条件对实验结果的影响。结果表明,采用高纯石墨套坩埚、0.1 g样品、熔融功率5.0 kW时,钕铁硼中氮释放完全、测试结果稳定。将本方法用于2种钕铁硼样品中氮的测定,相对标准偏差分别为0.85%、0.97%,加标回收率为94%~104%,且与化学法基本一致。
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Key words
Nd-Fe-B,magnetic materials,pulse melting,thermal conductivity method,nitrogen
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