Polycrystalline AL2O3 bodies based on melted aluminum oxide
AssigneeCenter for Abrasives and Refractories Research & Development C.A.R.R.D. GmbH
InventorSebastian Sachse
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Abstract
The present invention relates to polycrystalline Al2O3 bodies based on melted aluminum oxide having a mean crystallite size of the primary crystals between 20 μm and 100 μm and a closed macroporosity between 10% by volume and 30% by volume. The polycrystalline Al2O3 bodies may be obtained by tapping out and quenching a liquid aluminum oxide melt and simultaneous seeding of the pouring stream with seed crystals and can be used advantageously for the production of abrasive materials and refractory products.
Claims14
Polycrystalline Al2O3 bodies based on melted aluminum oxide having a content of α-aluminum oxide of greater than 98% by weight, made up of a plurality of Al2O3 primary crystals having a crystallite size between 20 μm and 100 μm characterized in that the Al2O3 bodies have a closed macroporosity having a pore volume between 10% by volume and 30% by volume, wherein the mean diameter of the pores is between 10 μm and 100 μm and the maximum pore diameter is about 120 μm.
Dependencies are inferred from the claim text.