Alumina sintered bodies and method for producing the same

Details Alumina sintered bodies and method for producing the same Alumina sintered bodies and method for producing the same

1997-03-27

1998-12-29

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Refractory

501128, 501125, 501153, 423625, 423626, 264 56, 264 63, C04B 3510

Patent

active

058541594

ABSTRACT:
An alumina sintered body containing, as impurities, sodium oxide, potassium oxide, silicon oxide, calcium oxide, ferric oxide and titanium oxide in a total amount in the range from 100 to 10000 ppm, in which a total amount of the sodium oxide and potassium oxide based on the total amount of the impurities is not more than 4 wt. %. In the manufacture of the sintered body, its starting powder is admixed with at least an acid compound to produce metal salts by a reaction of the acid compound with metals contained in the starting powder and the resulting metal salts are removed.

REFERENCES:
patent: 4892850 (1990-01-01), Hori
patent: 5382556 (1995-01-01), Takahashi et al.
patent: 5593468 (1997-01-01), Khaund et al.
Database WPI, Week 7433, Derwent Publications Ltd., London, GB; AN 74-59430V, XP002035211 & SU 399 487 A (G.M. Shapiro et al.) *abstract* Feb. 15, 1974.
Database WPI, Week 9619, Derwent Publications Ltd., London. GB; AN 96-184573, XP002035201 & JP 08 059 338 A (Sumitomo Metal Ind., Ltd.), Mar. 5, 1996 *abstract*.

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