Process for producing high density sintered alumina

Details Process for producing high density sintered alumina Process for producing high density sintered alumina

1976-08-23

1977-08-30

Carter, Herbert T.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 734, 423111, 423121, 423625, 423626, C01F 706, C01F 746

Patent

active

040452344

ABSTRACT:
Sintered alumina of low porosity and Na content is made from calcined alumina of 2-6 micron average particle size and about 0.2-1% by weight Na.sub.2 O content by treating the calcined alumina with a synergistically acting combination of a magnesium salt and a boron compound. Suitable magnesium salts include magnesium halides, nitrate, sulfate, acetate and stearate, the water-soluble salts being preferred. As boron compound H.sub.3 BO.sub.3 or B.sub.2 O.sub.3 can be employed. The quantity of magnesium salt in the combination, calculated as Mg, is kept in the range of about 0.01-0.3% by weight of Al.sub.2 O.sub.3, while the boron content, calculated as B.sub.2 O.sub.3, is maintained in the range of about 0.1-1% by weight of Al.sub.2 O.sub.3. Used of the synergistically acting combination in the indicated range allows manufacture of sintered alumina products of less than about 3% total porosity and less than about 0.03% by weight Na content.

REFERENCES:
patent: 2069060 (1937-01-01), Fessler
patent: 3384454 (1968-05-01), Barrington
patent: 3637406 (1972-01-01), Basley
patent: 3655330 (1972-04-01), Rettew et al.
patent: 3846146 (1974-11-01), Hunting et al.
patent: 3929496 (1975-12-01), Asano et al.
patent: 3973972 (1976-08-01), Wilson
patent: 3982955 (1976-09-01), Mansmann et al.

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