Abstract
Nanocrystalline tungsten powders of 99.9% purity were synthesized in large scale (1kg/batch) by recycling heavy alloy scrap using a chemical route. Effect of reduction temperature on conversion of tungsten oxide powders to tungsten revealed that it requires a temperature of 800°C with a residence time of 2h for complete reduction. Tungsten powder with an average particle size of 300nm and average crystallite size of 40nm were obtained using the above conditions. The efficiency of the reaction is 95.6%. The reported procedure is highly reproducible as the batch scale experiments were validated by repeating the experiment 10 times. Optimal use of acid content and lack of surfactant makes this process more economical when compared to earlier reported methods.
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