Method for controlling the size and morphology of alpha-alumina

Details Method for controlling the size and morphology of alpha-alumina Method for controlling the size and morphology of alpha-alumina

1996-12-30

1998-06-02

Straub, Gary P.

Chemistry: physical processes

Physical processes

Crystallization

423625, 423626, C01F 702, C01F 734

Patent

active

057592136

ABSTRACT:
A method for producing phase-pure, monodispersed, single crystal alpha-alumina particles of controlled size and shape comprises the steps of providing an aluminum hydrous oxide precursor and a glycol solution, dispersing said precursor in said glycol solution to create a suspension, heating and stirring said suspension in a closed pressure vessel to produce alpha-alumina particles, cooling said suspension, and removing said alpha-alumina particles from said solution. Additionally nucleation seeds may be added to the solution. Control of size is a function of seeding concentration, and control of morphology is a function of stirring rate.

REFERENCES:
patent: 4629618 (1986-12-01), Oguri etal.
patent: 4900537 (1990-02-01), Wilhelmy
patent: 5194243 (1993-03-01), Pearson et al.
patent: 5401703 (1995-03-01), Fukuda
Perky, John P, Editor, Chemical Engineers Handbook Third Edition, McGraw-Hill Book Co Inc NY NY 1950 pp. 1054-1061.

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