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US 6,284,694 B1Granted
Moulded spherical ceramic body, production process and use
AssigneeKorund Laufenburg, GmbH
InventorsPaul Moeltgen, Pirmin Wilhelm, Martin Luette
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Abstract
The present invention concerns a moulded microcrystalline spherical Al2O3- sintered body, process for its production as well as use.
Claims17
A molded microcrystalline sintered body comprising, as a primary ingredient ∝-Al2O3, characterized in that
- (a) the body is a sphere made up of sintered particles of uniform shape obtained by fluid-bed spray granulation and having a primary particle size <3 μm,
- (b) the sintered body has an average grain size d50 of its primary crystals, less than 3 μm,
- the diameter of the molded sintered body between 0.01 and 10 mm, and,
- the body having a hardness of ≧95% of the theoretical density TD.
1 more element
A process for manufacturing molded micro-crystalline spherical sintered bodies comprising, as a primary ingredient αAl2O3 with grain size d50 of pimary crystals of under 3 microns, sintered body diameter of .01 to 10 mm and hardness of equal to greater than 16 Gpa (HV200)and density equal to or greater than 95% of theoretical, comprising the steps of:
- (a) forming a suspension of αAl2O3 using Al2O3 solid of 3 micron or less,
- (b) processing the suspension through fluid bed spay granulation to form green bodies,
- (c) sintering the green bodies at 1,200-1600° C.
Dependencies are inferred from the claim text.