(1)The nanoscale tungsten powder with an average particle size of 19 nm was obtained by gradually reducing WO3, which was prepared by ultrasonic spray and thermochemical conversion process, into WO2.90 and W.

 

  (2)Compacting with a rubber die is a preferred method for making a tungsten green compact with the nanoscale powder, whereby a relative density of 46.2% was achieved.

 

  (3)The compact made from the nanoscale tungsten powder starts shrinkage at 1050℃, and the shrinkage rate is maximum at 1210℃. The shrinkage almost ends at 1500℃. In the case of the traditional tungsten powders, however, the compacts barely shrink.

 

  (4)After sintered in hydrogen at 1500℃, tungsten samples with a relative density of 96.4% and a particle size of 5.8 pm were prepared. As for the traditional tungsten powder, the relative density is only 68.2% after sintering.

 

 

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