The Coarse Grain Tungsten Powder Reduced by Ammonium Paratungstate at Medium Temperature
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- Category: Tungsten Information
- Published on Monday, 21 December 2015 16:25
Ammonium paratungstate (or APT) is a white crystalline salt of ammonium and tungsten, with the chemical formula (NH4)10(H2W12O42)·4H2O.
Ammonium paratungstate is produced by separating tungsten from its ore. Once the ammonium paratungstate is prepared, it is heated to its decomposition temperature, 600 °C. Left over is WO3, tungsten(VI) oxide. From there, the oxide is heated in an atmosphere of hydrogen, reducing the tungsten to elemental powder, leaving behind water vapor. From there, the tungsten powder can be fused into any number of things, from wire to bars to other shapes.
The coarse-grained tungsten powder was reduced by using ammonium paratungstate(APT) as raw materials and additive Li,Na salt at 1000 ℃ wet hydrogen condition. The morphology,phase composition and size distribution of coarse-grained tungsten powder were characterized by using SEM,XRD and laser particle size analyzer. The effect of temperature and time of reduction,types and content of Li and Na salt on the grain size of tungsten powder was studied.The result shows that the coarse-grained tungsten powder can be reduced directly using APT as raw materials and Li2CO3 as additive under the wet hydrogen condition at 1000℃ for 180min,which has well liquidity and integrated crystal,the average particle size is above 40μm.
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