Glass manufacturing – Processes – With pore forming in situ
Patent
1975-12-15
1978-03-21
Bashore, S. Leon
Glass manufacturing
Processes
With pore forming in situ
65 30R, 65 32, 106 40V, C03B 1908, C03C 1500
Patent
active
040801870
ABSTRACT:
The instant invention is directed to the production of foamed alkali metal silicate articles of low density, good chemical durability, and low thermal conductivity which can readily be made in essentially unlimited sizes and configurations. The process of the invention contemplates four general steps. First, an anhydrous glass consisting essentially of narrowly-defined compositions within the Na.sub.2 O and/or K.sub.2 O-Al.sub.2 O.sub.3 and/or B.sub.2 O.sub.3 and/or ZnO and/or Fe.sub.2 O.sub.3 -SiO.sub.2 field is hydrated. Second, particles of said hydrated glass not exceeding about 5 mm. in diameter are dehydrated in such a manner as to cause the formation of individual foamed bodies. Third, the individual foamed particles are collected together and rehydrated to a sufficient extent to bond said particles into an integral mass, but not so much to cause the foamed particles to collapse. Fourth, the integral mass is dehydrated to cause foaming thereof.
REFERENCES:
patent: 3261894 (1966-07-01), Seidi
patent: 3743601 (1973-07-01), Rao
patent: 3756839 (1973-09-01), Rao
patent: 3867156 (1975-02-01), Fukumuto et al.
patent: 3870496 (1975-03-01), Cutler
patent: 3877954 (1975-04-01), Wustefeld
patent: 3915720 (1975-10-01), Tarcza
patent: 3929439 (1975-12-01), Pierce
patent: 3948629 (1976-04-01), Bartholomew
Bashore S. Leon
Corning Glass Works
Janes Jr. Clinton S.
Miga Frank W.
Patty, Jr. Clarence R.
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