The Control 0f Molding Pressure and Pool Pressure Mode of Tungsten Crucible

Tungsten crucible’s molding is processing on the isostatic machine. When press the tungsten crucible, if the molding pressure is too large, it will make tungsten powder severely deformed, so the elastic stress will increase, eventually resulting in tungsten crucible cracking; if the molding pressure is too small, the density of the tungsten powder is not enough, tungsten crucible is also prone to cracking. Therefore, the scope of the molding pressure when pressing tungsten crucible should be at: 245MPa-260MPa.

In the pressing process, because the micro-hardness of tungsten powder is larger, so tungsten powder is easily deformed due to the external force, then, it will produce some distortion stress, if the pool pressure speed is too fast, then the release of the stress will be accelerated, which will result in crack of the tungsten crucible too. Therefore, only use the slow way of pool pressure mode to press tungsten crucibles.


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