高频燃烧红外吸收法测定钒铝合金中碳

发布时间：2019-04-30 10:49

【摘要】：控制样品粒度为100~160目(即96~147μm),称取0.10~0.20g样品,选择1.8g钨粒、0.30g纯铁、0.15g锡为助熔剂,用碳质量分数为0.006%~0.069%的钛合金标准物质建立校准曲线,建立了高频燃烧红外吸收法测定钒铝合金中碳含量的分析方法。在优化的实验条件下,以碳质量分数为横坐标,以其对应的峰面积为纵坐标绘制校准曲线,其线性回归方程为y=5.878+859.4 x,相关系数r=0.999。方法检出限为0.001 1%,测定下限为0.003 8%。称取一定量的铝屑和钒铁标准样品,按照AlV55钒铝合金的成分配比混合配制成钒铝合成样品,按照实验方法进行测定,测定值与理论值基本一致。将方法应用于铝钒合金实际样品(AlV55、AlV65、AlV75和AlV85)中碳的测定,结果的相对标准偏差均小于10%(n=7)。钛合金中碳的加标回收率为92%~107%。对于碳质量分数为0.040%的铝钒合金(AlV55),其扩展合成不确定度为0.002 6%。
[Abstract]:Control the particle size of the sample to 160 mesh (96 ~ 147 渭 m), weigh 0.10 脳 0.20g sample, select 1.8g tungsten particle, 0.30g pure iron, 0.15g tin as flux, establish the calibration curve with the reference material of 0.069% C content of 0.069% Ti alloy, and select 1.8 g tungsten particle, 0.30g pure iron, 0.15g tin as flux, and control the sample size to 160 mesh (96 ~ 147 渭 m). A method for the determination of carbon content in vanadium aluminum alloy by high frequency combustion infrared absorption method was established. Under the optimized experimental conditions, the calibration curve is drawn with the mass fraction of carbon as the transverse coordinates and the corresponding peak area as the longitudinal coordinates. The linear regression equation is ya 5.878 859.4 x, and the correlation coefficient is r = 0.9999. The detection limit was 0.001 and the detection limit was 0.003 8%. According to the composition ratio of AlV55 V-Al alloy, the V-Al synthesis samples were prepared by weighing a certain amount of standard samples of Al-V and V-Fe, and determined according to the experimental method. The measured values were basically consistent with the theoretical values. The method has been applied to the determination of carbon in Al-V alloy samples (AlV55,AlV65,AlV75 and AlV85). The results show that the relative standard deviations are less than 10% (n = 7). The recovery rate of carbon in titanium alloy was 92% ~ 107%. For Al-V alloy (AlV55) with 0.040% carbon content, the uncertainty of extended synthesis is 0.002.
【作者单位】：中国船舶重工集团第七二五研究所;
【分类号】：TG115

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