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US 5,523,074 AGranted
Process for preparaing polyhedral .alpha.-alumina particles
AssigneeSumitomo Chemical Company, Limited
InventorsAkihiko Takahashi, Hiroshi Tabuchi
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Abstract
Polyhedral .alpha.-alumina particles having a particle size on the order of a micrometer and high purity are prepared by maintaining a compression molded aluminum material having, on its surface, a binary compound of aluminum and oxygen atoms or a ternary compound of aluminum, oxygen and hydrogen atoms in an aluminum melt.
Claims7
A process for preparing polyhedral .alpha.-alumina particles, comprising the steps of:
- compression molding an aluminum material having, on its surface, at least one compound selected from the group consisting of a binary compound of aluminum and oxygen atoms and a ternary compound of aluminum, oxygen and hydrogen atoms to obtain a compression molded aluminum material;
- subjecting said compression molded aluminum material to a temperature of from 680.degree. to 1000.degree. C. to form an aluminum melt;
- and
- recovering polyhedral .alpha.-alumina particles from said aluminum melt.
1 more element
Dependencies are inferred from the claim text.