α-Alumina fine powder and a method of producing the same

Details α-Alumina fine powder and a method of producing the same α-Alumina fine powder and a method of producing the same

2006-04-25

2006-04-25

Bos, Steven (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S111000, C423S133000

Reexamination Certificate

active

07033567

ABSTRACT:
α-Alumina powder of fine particles having the primary particle diameters of from 10 nm to 100 nm, and of a high ratio of α-phase and further having capability to provide a sintered body with high density, and a method of manufacturing the α-alumina powder is provided. The method for manufacturing the α-alumina powder comprises a step of mixing an aluminum compound which is the precursor for the corresponding α-alumina and at least one selected from the group consisting of a titanium compound, an iron compound, a chromium compound, and α-alumina, and aluminum nitride, aluminum carbide and a aluminum boride as a seed crystal(s), and a step of calcining the mixture at a temperature of from 600° C. to 1000° C. in the presence of HCl gas in an concentration of 1% by volume to 20% by volume.

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