발간논문

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Vol.41, No.1, 71 ~ 77, 2003
Title
Preparation of High Purity Tungsten Powders from Tungsten Oxide by SHS Process
이승영 Seung Young Lee , 윤여훈 Yeo Hun Yoon , 이종현 Jong Hyeon Lee , 원창환 Chang Whan Won
Abstract
99% Pure tungsten powders were prepared by self-propagating high temperature synthesis (SHS) process from a mixture of ammonium paratungsten(APT) and Mg powders. The concurrently formed MgO in the product was leached with an HCI solution. The optimum molar ratio of APT to Mg is 1:46 and the compaction pressures range from 2000 to 4000 psi. The propagation velocity and combustion temperature increased, as the compact diameter increased. The weight change and elongation of the SHS product were affected by compaction pressure on the green pellet. The tungsten product had a purity of 99% and mean size of 2∼3 μm.
Key Words
Syntheais, APT, SHS, Tungsten
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