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| A method for determining nitrogen in Ti (C, N) powder with high nitrogen content by inert gas melting thermal conductivity method |
| HE Mingqian1，2，ZHONG Hua1，2 |
| （1.Panzhihua Iron & steel Research Institute, Panzhihua 617000, China; 2. Sichuan Panyan Testing Technology
Co.,LTD，Panzhihua 617000, China） |
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Abstract Since traditional methods can only measure Ti (C, N) with a nitrogen content of less than 5%, it cannot
be applied to Ti (C, N) with a high nitrogen content. Therefore, a method for determining the nitrogen content of
high nitrogen content Ti (C, N) powder by inert gas melt-thermal conductivity method was established, which could
effectively solve the shortcomings of traditional methods, and the upper limit of detection could be increased to
14%. Using an ONH analyzer, the experimental conditions were finally optimized to 0.1 g of the sample mixed
with 0.65 g of nickel and 0.16 g of tin, and then placed into a high-temperature graphite crucible. Carrier gas transports
nitrogen released in the molten state to a thermal conduction tank for determination. In this paper, the“segmented
heating”method was used, the analysis power was gradually increased from 1.5 kW to 3.8 kW. Compared
with direct heating, the“segmented heating”method can effectively increase the release rate and stability of nitrogen.
Under the above conditions, the relative standard deviation of the Ti (C, N) determination results with high nitrogen
content is 0.3%, and the analysis results are consistent with the results of distillation titration. Therefore, the
accuracy and stability of the method can fully meet the needs of the determination of 5% to 14% high nitrogen content
Ti (C, N).
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Received: 11 January 2022
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2023, Vol. 33 
