直流电弧原子发射光谱法测定超细碳化钨中痕量元素

超细碳化钨(WC)主要用于生产棒材硬质合金,一般含有0.1％～1.0％的碳化钒(VC)或碳化铬(Cr3 C2),具有细化晶粒作用,提高棒材合金强度.超细碳化钨中痕量元素对合金性能具有重要的影响.因此建立一种快速测量超细碳化钨中痕量元素检测方法具有重要的生产指导意义.实验采用直流电弧原子发射光谱仪,建立了快速测量超细碳化...

Determination of trace elements in ultrafine tungsten carbide by direct current arc atomic emission spectrometry

Ultrafine tungsten carbide (WC) is mainly used to produce rod hard alloys. It generally contains 0.1%-1.0% vanadium carbide (VC) or chromium carbide (Cr₃C₂), which has grain refining effect to enhance the strength of rod alloys. The trace elements in ultrafine tungsten carbide have an important influence on the properties of alloys. Therefore, the establishment of one detection method for the rapid determination of trace elements in ultrafine tungsten carbide has important significance to guild the production. A method for the rapid determination of 16 trace elements in ultrafine tungsten carbide by direct current arc atomic emission spectrometry was established. Through the excitation condition experiments, the following parameters for elements were confirmed: the arcing current was 5 A, the excitation current was 12 A, and the electrode distance was 4 mm. The blank electrode was measured repeatedly. The limits of detection were less than 1 μg/g, and the limit of detection was 1.35 μg/g for As. The internal control standard sample of WO₃ was measured. The difference between average value and standard value was less than 1 μg/g, and the difference between two measurements was less than 1.5 μg/g, indicating that the accuracy and repeatability of method could meet the requirements of quality control. The internal control standard sample of ultrafine tungsten carbide was determined for one week. The standard deviations of Fe, Ni, Co, Si, Ca, Ti, Mg, Mn, Al, As, Sb, Bi, Cu, Cd, Pb and Sn were all less than 1 μg/g. The stability of method was good, which could meet the daily analysis requirements of trace elements in tungsten carbide.