Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1977-03-09
1978-09-26
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 65, 264 66, 264 85, 264320, 264332, 429193, C04B 3510
Patent
active
041170563
ABSTRACT:
Beta-alumina ceramic articles of improved strength and durability particularly for use in sodium sulphur cells are produced by compacting beta-alumina particles or a mixture of powders which react to form beta-alumina, sintering the compacted material in air or oxygen to form an impervious polycrystalline ceramic body and then further densifying the sintered body by subjecting it to the direct isostatic pressing action of a fluid, e.g. a gas at a pressure of at least about 5,000 psi and at a temperature between 1200.degree. C and 1500.degree. C which is above the elastic/plastic transformation, said fluid being inert and non-permeating with respect to said fired body and subsequently cooling the body under pressure to a temperature below the elastic/plastic transformation.
REFERENCES:
patent: 3795723 (1974-03-01), Clendenen et al.
patent: 3950463 (1976-04-01), Jones
Chloride Silent Power Limited
Parrish John A.
White Robert F.
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