Abstract：The experimental conditions for determination of low carbon in BAu20NiCrFeSiB brazing alloy by high frequency combustion-infrared absorption method were discussed. The effect of flux and crucible on blank was investigated. The results showed that, the determination results were optimum under the following conditions: tungsten-tin flux dosage of 1.2 g, analytical time of 40 s and comparison level of 3%. When the bottomed crucible was prepared by tungsten-tin flux and iron flux was applied, the blank value was much lower than the carbon content in sample and was very stable. Since there was no BAu20NiCrFeSiB brazing alloy certified reference material, nickel-based high temperature alloy certified reference material GH3128 with similar matrix was used to calibrate the instrument. The proposed method was applied to the determination of carbon in actual sample, and the results were 0.015 8% and 0.014 7%, respectively. The relative standard deviation (RSD, n=11) was not more than 1.7%, and the recoveries of standard addition were between 97% and 102%.
杨丽，张庸，张继民，刘新，韩树国. 高频燃烧-红外吸收法测定钎料中低碳[J]. 冶金分析, 2013, 33(9): 28-31.
YANG Li, ZHANG Yong, ZHANG Ji-min, LIU Xin, HAN Shu-guo. Determination of low carbon in brazing alloy by high frequency combustion-infrared absorption method. , 2013, 33(9): 28-31.
