Determination of hydrogen in tungsten alloy by inert gas pulse fusion infrared absorption method
MA Qi1, ZHU Xiu-hui2, WANG Bo2, HE Xia2, WANG Wan-ying2
1. Ordnance Industry Northwestern Physical and Chemistry Testing Center, Xi′an 710043, China; 2. Northwest Industrial Group Metrology Physical and Chemistry First Center, Xi′an 710043, China
Abstract：The introduction of trace hydrogen in the sintering process of tungsten alloy was harmful to the properties of materials. The determination of hydrogen in tungsten alloy by inert gas pulse fusion infrared absorption was studied. By optimizing the analytical power, sample mass, flux and its addition mode, the following conditions were obtained: the U-shaped thick graphite crucible was selected; the analytical power was 4.0kW; the sampling mass was in range of 0.20-0.50g; the nickel flux was directly added into the crucible; after degassing (lower bath material), the tested tungsten alloy sample was put into the crucible. This addition mode could effectively reduce the interference caused by carrier gas, graphite crucible, furnace blank and especially flux. The calibration curve of hydrogen was established with iron and steel reference material. The linear correlation coefficient was 0.9990, and the limit of detection was 0.15μg/g. The precision test of hydrogen in tungsten alloy was carried out, and the relative standard deviations (RSD, n=6) of analysis results were not more than 8.4%. The spiked recovery test was conducted using the mixed powder based on three kinds of tungsten alloy with high hydrogen content. The recoveries were between 94.4% and 105.6%.
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MA Qi, ZHU Xiu-hui, WANG Bo, HE Xia, WANG Wan-ying. Determination of hydrogen in tungsten alloy by inert gas pulse fusion infrared absorption method. , 2020, 40(9): 53-56.
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