Method of manufacturing .alpha.-alumina

Details Method of manufacturing .alpha.-alumina Method of manufacturing .alpha.-alumina

1974-06-24

1977-04-26

Carter, Herbert T.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 65, 106 66, 106 734, 423625, C04B 3504, C04B 3510, C04B 3512

Patent

active

040199142

ABSTRACT:
A method of manufacturing .alpha.-alumina with a degree of purity of at least 98% which has a high sintering activity. The .alpha.-alumina contains at least 98% .alpha.-Al.sub.2 O.sub.3 and not more than 0.1% Na (calculated as Na.sub.2 O), and not more than 0.1% Ti (calculated as TiO.sub.2). The .alpha.-alumina also contains between 0.03% and 2% of Fe.sub.2 O.sub.3 and/or Cr.sub.2 O.sub.3. The .alpha.-alumina is formed by first fine grinding and then calcining, preferably at a temperature between about 1120.degree. C and 1350.degree. C, an aluminum hydroxide and/or hydrated aluminum oxide. The .alpha.-alumina is then cooled and finely ground to provide an .alpha.-alumina having excellent sintering activity.

REFERENCES:
patent: 3238049 (1966-03-01), Somers
patent: 3377176 (1968-04-01), Wolkodoff et al.
patent: 3615775 (1971-10-01), Teeter
patent: 3637406 (1972-01-01), Bailey
patent: 3772416 (1973-11-01), Clendenen
patent: 3854965 (1974-12-01), Niwa et al.

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