Determination of Hafnium Content in WC-Co Cemented Carbide by Inductively Coupled Plasma Atomic Emission Spectroscopy
In the production of cemented carbides,hafnium is often used as an additive to improve the mechanical properties of cemented carbides.Therefore,accurate determination of the hafnium content in cemented carbides is of great significance.The existing chemical volumetric method for determining hafnium in cemented carbides has the disadvantages of high risk,complex operation,and low analysis efficiency.This article explored the determination method of hafnium in cemented carbides from the aspects of sample pre-treatment,selection of analytical lines,and exploration of matrix effects.It established a method for determining the hafnium content in WC-Co cemented carbides by using inductively coupled plasma atomic emission spectrometry,which was safe,efficient,and simple to operate,at a low cost.Under the selected conditions,a mixed solution with sulfuric acid:ammonium sulfate(1:1)was combined with citric acid and hydrogen peroxide to serve as the pretreatment solvent,and the hafnium spectral line 264.141 nm was selected as the analytical spectral line.The standard solution was prepared using the matrix matching method.The linearity of the method calibration curve was greater than 0.999 9,and the linear range was 0.0-2.0 µg/mL.The detection limit was 0.008 4 µg/g,and the recovery rate was 99.17%-103.63%.The RSD was less than 0.758%.This method provided a reliable method for detecting the hafnium content in WC-Co cemented carbides.
NETL
NSTL
万方数据
