Ready-to-Sinter Nanopowders for the Ceramic Industry

Deagglomeration

Nanograins have highly specific surface area, as a consequence they naturally form agglomerates which can go up to several microns. These agglomerates have inner pores (or mesopores) that are very difficult to get rid of during pressing. Therefore, agglomerated nanopowders will have a low green density and a high linear shrinkage. Last but not least, in order to have a low sintering temperature, nanopowders need to be de-agglomerated.

Suspensions and slurries

Given their highly specific surface area, nanopowders are extremely difficult to put in suspension. If just stirred in water, grains will not get totally wet and very porous aggregates will form. All of this leads to quick sedimentation and low green density.

Green density and shrinkage

These technical challenges, when not correctly addressed, have a big impact on green density, regardless of the process: press, casting, or injection molding.

Pore size entails that the sintering temperature remains similar with micronic powders sintering temperature and that grain size after sintering is not optimum.

Nanoe’s R&D staff has been working hard to fix all these technical challenges.


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