Method for the manufacture of transparent aluminum oxide ceramic

Details Method for the manufacture of transparent aluminum oxide ceramic Method for the manufacture of transparent aluminum oxide ceramic

1989-01-23

1990-08-28

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Aluminum compound containing

501127, 2523157, 423127, C04B 3510

Patent

active

049525395

ABSTRACT:
A method is disclosed for manufacturing transparent aluminum oxide ceramic articles by sintering dry-pressed acid-containing aluminum oxide monohydrate in vacuo or in hydrogen. The method includes obtaining the acid-containing aluminum oxide monohydrate by peptisization of aluminum alkoxide with a mixture of water and acid vapor, with the acid bound to the formed monohydrate by electrostatic force. Such attachment allows ease in separation of the monohydrate crystals in water due to the polarizing effect of the acid. Subsequently, the acid-containing aluminum oxide monohydrate is gelled and dried, with the product, having an acid content of from 12 to 25%, being suitable for forming transparent ceramic articles without requiring calcination.

REFERENCES:
patent: H626 (1989-04-01), Covino
patent: 4357427 (1982-11-01), Ho et al.
Yoldas, B. E., Ceramic Bulletin, vol. 54, No. 3, pp. 286-290, 1975.
Yoldas, B. E., Alumina Gels that Form Porous Transparent Al.sub.2 O.sub.3, pp. 1856-1860, 1975.
ISO 8008, Aluminium Oxide Primarily Used for the Production of Aluminium-Determination of Specific Surface Area by Nitrogen Absorption-Single Point Method, pp. 1-9, 1986.

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