Spray Drying Ceramic Powder: Granulation for Pressing
How a spray dryer granulates ceramic slurries (alumina, zirconia, silicon nitride) into flowable, narrow-distribution granules that press and sinter consistently.
Ceramic powders — alumina, zirconia, silicon nitride and nano materials — are spray-dried (granulated) from a slurry into free-flowing granules with a controlled size, ready for pressing and sintering.
The drying challenge
- Flowable granules needed for even die-filling in pressing.
- Narrow size distribution for consistent sintering and density.
- Low contamination, since impurities become defects in the fired part.
Why spray drying fits
- Granulation for pressing. Spray drying turns a fine slurry into spherical, free-flowing granules that fill dies evenly.
- Narrow distribution. A tight particle distribution (D10–D90 ≤5μm on fine powders) gives consistent sintering and can lower the sintering temperature by 100–200°C, raising density.
- Clean operation with stainless-steel contact parts to limit contamination.
- Nano materials can be dried to a well-dispersed powder — for example high-surface-area alumina for battery-separator coatings.
Figures are industry-typical for spray drying; verify against your own material before relying on them as guarantees.
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Frequently Asked Questions
Spray drying granulates a ceramic slurry into spherical, free-flowing granules that fill pressing dies evenly and sinter consistently, with a controllable particle size.