Uniaxial pressing and isostatic pressing are both methods used to compact powder samples.
However, they have some important differences.
5 Key Differences Explained
1. Application of Force
Uniaxial pressing involves applying a force along one axis, typically in an up/down direction.
Isostatic pressing applies pressure from all directions to the specimen.
2. Suitable Shapes
Uniaxial pressing is used for pressing simple shapes that have two fixed dimensions, such as cylinders or squares/rectangles.
Isostatic pressing is particularly useful for shaping complex parts.
3. Equipment and Cost
Uniaxial pressing requires a mold and a hydraulic press and is a relatively inexpensive process.
Isostatic pressing uses a flexible rubber or plastic mold and can be more expensive due to the need for high-pressure vessels.
4. Pressure Distribution
In uniaxial pressing, the powder close to the moving pressing surfaces is compacted more than the powder further away from the pressing surface.
Isostatic pressing reduces the gradient effects between the powder particles and the die walls, resulting in more uniform particle packing.
5. Automation and Precision
Uniaxial pressing is suitable for samples with simple shapes and can provide green bodies with accurate dimensions.
Dry-bag isostatic pressing is easier to automate than wet-bag isostatic pressing, but it may not provide the same dimensional accuracy as uniaxial pressing.
Continue exploring, consult our experts
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