I'm looking for corundum nano powder with a BET > 15 m2/g and a particle size smaller than 200 nm to create an easy sintering pure alumina matrix at 1200 °C.
I don't know where to find such a nanopowder, but given the density of corundum, the particles should be smaller than 100 nm (not 200) in order to obtain a surface area higher than 15 m2/g.
Alain
TM_DAR with a particle size of 100 - 200 nm d50 is to coars for my application.
I havn't calculated the particle size and the BET. Thanks alot for the calculation. For me a surface > 15 m²/g is very important.
Sumitomo AKP-53 has 11.7 m2/g. The maximum I know for commercial powders.
Thank you for the tip, but I also know the AKP53, and it also does not sinter like I wish.
I've made some studies for AZO nanoparticles synthesys with laser pyrolysis technique and particles with around 20 nm were synthesized. I can try to synthesize Al2O3 nanoparticles alone and I expect to synthesize nanoparticles around the same values, but I don't know if you are still interested. Please let me know this!
Hello together,
I found a source for nano corundum powders:
http://www.jingruinano.com/en/display.asp?id=133
Yes it is very important, because in my case the transformation from beta or gamma to alpha effects a change in volume. This change destroy my sinternecks.
In some cases, it may be possible to avoid degradation of integrity of the structure due to phase transformations of alumina even in complex geometries (or, also possible, exactly due to the special shape of the structure):
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b00437
You could attritor mill a powder with a lower surface area to get to 15 m2/g.
http://www.unionprocess.com/tech.html
Go to link above, varios papers are in there and union process manufactures attrition mills among others.
https://www.sigmaaldrich.com/catalog/product/aldrich/718475?lang=en®ion=US&cm_sp=Insite-_-prodRecCold_xorders-_-prodRecCold2-2t
Sigma aldrich has alumina nano powders- see link above.
thank you ... I will order These powder. We have also an attrtion mill … now I will use coarse alumina corundum powder and mill it ;-)
The powder from Sigma ALdrich is the Evonik ALuC … it is a mixture of Gamma and Delta … no Alpha corundum
I found a source of nano corundum alpha alumina powder :-)
https://www.ikts.fraunhofer.de/de/departments/structural_ceramics/oxide_ceramics/materials_synthesis_development/nanocorundum_al2o3.html
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