Isostatic pressing is carried out by two different techniques: wetbag pressing or drybag pressing. In wetbag pressing, the powder is filled into flexible molds which are sealed outside the pressure vessel.
Isostatic pressing is carried out by two different techniques: wetbag pressing or drybag pressing. In wetbag pressing, the powder is filled into flexible molds which are sealed outside the pressure vessel. Several molds (either of the same shape or of different shape) are then immersed in a fluid, most commonly water, and pressure is applied isostatically. Wetbag pressing is the most common technique for producing forging or rolling performs, where an even and high green density is more important than dimensional control. Nevertheless, wetbag pressing is also used for more complex geometries and even near-net shape parts. The size of the part is limited by the size of the pressure vessel. Tungsten ingots of up to 1000kg are produced via wetbag pressing. In drybag pressing, the elastomeric mold is fixed into the pressure vessel. The mold is filed with powder and sealed with a cover plate. Then pressure is applied between the mold and the vessel wall. After pressure release, the cover is removed and the part removed. Then the procedure starts again. Pressure Vessels with both top and bottom plate are in use, and allow more rapid removal of compact.
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