Comparison of Dry Pressing and Isostatic Pressing
1. Dry pressing has only one or two pressure surfaces, while isostatic pressing is multi-axis pressure, that is, multi-directional pressure and multi-sided pressure, which is conducive to compacting the powder to a considerable density. At the same time, the linear displacement of the powder particles is small, and the friction work consumed during the movement of the powder particles is relatively small, which improves the pressing efficiency.
2. Compared with other press forming with roughly the same compressive strength, isostatic pressing can obtain a higher green density, and it is uniform and dense in all directions, without major changes due to the thickness of the shape.
3. Since the pressure directionality of isostatic pressing is not much different, the friction between powder particles and between particles and the model is significantly reduced, so the phenomenon of stress in the green body is rarely seen.
4. The green body formed by isostatic pressing has high strength, uniform internal structure and no particle orientation arrangement.
5. Isostatic pressing adopts powder with very low water content (generally 1%-3%), and it is unnecessary or rarely to use adhesives and lubricants. This is advantageous for reducing drying shrinkage and firing shrinkage.
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