STUDY OF PREPARATION PROCESS OF TUNGSTEN POWDER BY SHS WITH A MAGNESIUM THERMIT STAGE
来源期刊：Acta Metallurgica Sinica2004年第5期
论文作者：Z.H.Dou Y.L.WANG H.Yang T.A.Zhang
Key words：self-propagating high-temperature synthesis (SHS); magnesium thermit; tungsten powder;
Abstract: Tungsten powder was fabricated from the system CaWO4-Mg by self-propagating high-temperature synthesis (SHS) with a magnesium thermit stage. The physic-chemical change during heating and the effects of pressure of sample and diluents (W powder) on product have been studied. The experimental results show that the porosity of combustion product and the particle size of final tungsten powder decrease with increasing pressure of sample. Addition of diluents could increase the particle size of final tungsten powder. The purity of tungsten is improved by leaching in NaOH solution. The results of spectral analysis and particle size distribution of final tungsten powder show that the final Tungsten powder has a median diameter of 0.87μn, specific surface area of 1.09m2/g and purity of above 99.0%.
Z.H.Dou1，Y.L.WANG1，H.Yang1，T.A.Zhang1
(1.School of Metallurgy & Materials, Northeastern University, Shenyang 110004, China;
2.Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China)
Abstract:Tungsten powder was fabricated from the system CaWO4-Mg by self-propagating high-temperature synthesis (SHS) with a magnesium thermit stage. The physic-chemical change during heating and the effects of pressure of sample and diluents (W powder) on product have been studied. The experimental results show that the porosity of combustion product and the particle size of final tungsten powder decrease with increasing pressure of sample. Addition of diluents could increase the particle size of final tungsten powder. The purity of tungsten is improved by leaching in NaOH solution. The results of spectral analysis and particle size distribution of final tungsten powder show that the final Tungsten powder has a median diameter of 0.87μn, specific surface area of 1.09m2/g and purity of above 99.0%.
Key words:self-propagating high-temperature synthesis (SHS); magnesium thermit; tungsten powder;
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