Lightweight porous aggregate comprising alkali metal borosilicoa

Details Lightweight porous aggregate comprising alkali metal borosilicoa Lightweight porous aggregate comprising alkali metal borosilicoa

1979-08-27

1981-12-29

Poer, James

Compositions: ceramic

Ceramic compositions

Pore-forming

106 75, 106288B, 501 85, 501 99, C04B 3100

Patent

active

043080650

ABSTRACT:
A lightweight aggregate comprising an alkali metal borosilicoaluminate, is in the form of discrete, porous and expanded particles of approximately spherical shape, has a specific weight between about 60 and about 600 kg/m.sup.3 and a compression strength of from about 140 kg/cm.sup.2 up to about 250 kg/cm.sup.2, is highly insoluble in water, steam, acids or bases, has a melting temperature above 1500.degree. C. and a low alkalinity, and chemically comprises a homogeneous admixture of acid, basic and amphoteric oxides.
A highly preferred embodiment of the aggregate has an M.sub.2 O/B.sub.2 O.sub.3 ratio between about 3:1 to about 6:1, where M is an alkali metal.

REFERENCES:
patent: 2047016 (1936-07-01), Elias
patent: 2117605 (1938-05-01), Fowler et al.
patent: 3700470 (1972-10-01), Barton
patent: 3776746 (1973-12-01), Abe
patent: 3793039 (1974-02-01), Rostoker
patent: 3840380 (1974-10-01), Kraemer et al.
patent: 3990901 (1976-11-01), Engstrom et al.
patent: 4162166 (1979-07-01), Walls-Muycelo

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