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高温合金中氮含量的测定通常采用化学分析法,即凯氏法.但是对于氮含量低的试样,采用凯氏法分析则比较困难.因为高温合金的化学成分大多比较复杂,试样不易溶解,尤其是镍基高温合金.为了溶解试样,往往需要用大量试剂,操作手续比较麻烦,溶样时间也很长.这样,溶解试样这一环节不仅费时间,还可能带来相当大的氮空白值,影响低含量氮的测定.脉冲加热法已用于高温合金中氮的测定,但更多的是用于钢
The determination of nitrogen content in superalloys is usually carried out by chemical analysis, that is, Kjeldahl method, but Kjeldahl analysis is more difficult for samples with low nitrogen content because the chemical composition of superalloy is mostly complicated and the sample is not easily dissolved , Especially the nickel-based superalloy.In order to dissolve the sample, often need to use a large number of reagents, the operation procedure is too much trouble, the sample time is also very long.So dissolving the sample of this link not only takes time, but also may bring considerable Nitrogen blank value, the impact of low nitrogen content determination. Pulse heating method has been used for the determination of nitrogen in superalloys, but more for steel