Suppression of tungsten crucible should choose the granularity of tungsten powder. Otherwise will be all the craze in the suppressing process. 

In general the granularity of tungsten powder can't use coarser. Too thick, is smaller than the surface, less contact area between powder, pressed compact density low easy craze after the large contact area between fine is greater than the surface of powder, the displacement between the powder and the deformation is large, elasticity coefficient increases, pool, due to the stress relaxation will cause cracking experiment to neutralize tungsten crucible crucible should choose size 2.5 m to 3.0 m, 2.8 g/cm3 ~ 3.2 g/cm3 should conform to the chemical composition of tungsten powder FW1 at the same time In particular, the oxygen content should be kept below 0.1%