Method for the preparation of .alpha.-aluminum oxide powder

Details Method for the preparation of .alpha.-aluminum oxide powder Method for the preparation of .alpha.-aluminum oxide powder

1992-11-18

1994-02-08

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501153, 423625, C04B 3510, C01F 702

Patent

active

052848094

ABSTRACT:
Aluminum oxide powders having a high .alpha. proportion, crystallite sizes of approximately 0.1 .mu.m and narrow particle size distribution are prepared from customary Bayer aluminum hydroxide (gibbsite) or from aluminum oxide calcined at a low temperature. The starting material is wet-disagglomerated, mixed with .alpha.-aluminum oxide nuclei, dried and calcined. The calcination produces agglomerates which already have the crystallite size required, and which only need to be disagglomerated to the particle size required. The .alpha.-aluminum oxide powders prepared by such process are particularly suitable as a starting material for the production of high-performance ceramics, for example, of blanking dies.

REFERENCES:
patent: 4623364 (1986-11-01), Cottringer et al.
Somasundaran, P "Theories of Grinding" Ceramic Processing Before Firing, p. 114, Ed Onada & Hench, 1978.

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