How to remove the sintered material which has been fully stuck at the base of alumina crucible? It is synthesized as stone like material after sintering at 1400 deg C. Should any other kind of non sticky crucible is required or any other method exists to extract out the melted sticky sintered synthesized material?
Chemical cleaning can be very difficult, so I recommend sandblasting with fine corundum.
This type of problem generally arises with the aluminum crucibles. Materials diffuse in the bottom or side of the crucible at high-temperature sintering due to the porous nature of the aluminum crucible. With chemical cleaning, it's not possible. there may be a little chance of removing if you heat the empty crucible at a higher temperature than your previous sintering temperature. otherwise, you should use platinum crucible or platinum foil in order to avoid this type of problem in the future.
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