Uniaxial pressing is a method used to compact powder samples.
A force is applied along one axis, usually up and down.
This process is ideal for creating simple shapes with two fixed dimensions, like cylinders or rectangles.
Uniaxial pressing uses a mold and a hydraulic press, making it a cost-effective option.
However, it comes with several limitations.
5 Key Differences Explained
1. Aspect Ratio Limitation
Samples should not have a high aspect ratio (length to width ratio).
Powder near the pressing surfaces is compacted more than the powder further away, leading to uneven compaction.
2. Shape Limitation
Uniaxial pressing is limited to simple shapes.
Complex geometries are difficult to achieve due to the unidirectional nature of the applied force.
3. Direction of Pressure
Uniaxial pressing applies pressure in one direction.
Isostatic pressing applies pressure uniformly from all directions.
4. Mold Type
Uniaxial pressing uses rigid molds, often made of steel.
Isostatic pressing uses flexible molds, typically made of elastomers or similar materials.
5. Uniformity of Compaction
Isostatic pressing provides more uniform compaction and density.
It eliminates the density variations seen in uniaxial pressing.
Continue exploring, consult our experts
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