Why is material characterization important?
As with other powder metallurgy processes, powder characteristics can greatly affect the results of pressing and sintering, and should, therefore, be carefully characterized. Particle packing and the apparent density of the powder blend are particularly critical. A lower apparent density, for instance, produces greater compaction and cold-welding in the particles on pressing, resulting in a stronger ‘green body’.
Another important powder characteristic is interparticle friction, which facilitates contact, deformation, and densification of the structure during pressing. Phase composition and grain size are also important to control, since these characteristics can affect the powder’s hardness and thermal properties. This, in turn, affects not only pressing efficiency and sintering behavior but also the mechanical properties of the pressed part. Finally, the powder must also comply with the alloy composition of the material specified.
How can Malvern Panalytical’s solutions help?
To support manufacturers in meeting these requirements, Malvern Panalytical offers several characterization solutions for press and sinter. These can be used to:
- Predict and control powder packing to achieve the required volume reduction and degree of cold-welding
- Specify and control the quality of the powder feedstock, including particle size, shape, and elemental composition
- Ensure optimum flow and packing in the die to prevent defects in the sintered component
- Ensure finished parts have the correct phase structure and grain size, and are free from residual stresses