Method for producing α-alumina particulate

Details Method for producing α-alumina particulate Method for producing α-alumina particulate

2007-12-11

2007-12-11

Sample, David (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S128000, C423S625000, C423S626000

Reexamination Certificate

active

10785083

ABSTRACT:
A method for producing an α-alumina particulate is described. The method for producing an α-alumina particulate comprises steps of (Ia) and (Ib), or a step of (II):(Ia) removing water from a mixture containing water, a seed crystal and a hydrolysate obtained by hydrolysis of an aluminum compound under conditions of a pH of 5 or less and a temperature of 60° C. or less,(Ib) calcining the resulted powder,(II) calcining a mixed powder containing 75-1 wt % of an α-alumina precursor (in terms of Al2O3) and 25-99 wt % of a seed crystal (in terms of oxide of metal component).

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