The short answer is yes, but what type of Al2O3 do you want to make?
90%? What applications will it be used for?
Ultimately mechanical, electrical, creep resistance and chemical resistance
can all be dramatically affected by the flux and/or sintering aid added and
the type of alumina being used in the body.
Actually I want to work with high-density 99% alumina for crucible (?)
or milling balls. What I concern is I don't want to add flux in the
alumina. With low sintering temperature, however, I am sceptical about
the density of the result. I may have to use an isostatic press but
would this method will help the alumina to yield 100% density?
What applications are the crucibles for? - generic high density or
applications with a lot of thermal shock?
You can try using some fine alumina's with beohmite additions, but the
material may be hard to process.
ceraboy's reply was right on the mark - but it may take some searching and
the raw material cost will go up.
I think it is possible, but you'll have to do some development work with
both your processing and materials.
(or higher a consultant who can set your process up - I can't think of
anyone at the moment, but I can get some names for you if you'd like)
Both processing and materials will play a role in the finished product. I
think the best approach is:
1. Bring someone in who can look at your capabilities and give some
2. If you have capable people there, do some r&D
3. Buy a high temperature kiln
I worked with an ultra-fine high purity (99% + MgO) specialty alumina
several years back that sintered to high density at 1300C. I thought
it was a Baikowski alumina, but it has been a while. The material was
rather pricy if I remember correctly. I work with aluminas quite
frequently so this sinterability is quite unique, but you just might be
able to find a decent nanopowder to work with. If I can remember
anymore details I will pass them your way.
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