Method of making a cellular body from a high silica borosilicate

Details Method of making a cellular body from a high silica borosilicate Method of making a cellular body from a high silica borosilicate

1977-10-17

1980-03-11

Kellogg, Arthur D.

Glass manufacturing

Processes

With pore forming in situ

106 40V, 106 41, C03B 1908

Patent

active

041926641

ABSTRACT:
An intimate mixture of an amorphous silica potassium oxide, boric oxide, alumina and a cellulating agent is subjected to a temperature of between 1390.degree. C. to 1450.degree. C. for a sufficient time to coalesce the mixture and gasify the cellulating agent and form a cellular body. The mixture is prepared by first forming a slurry and, drying the slurry to form aggregates, and are thereafter comminuted if necessary to form a pulverulent batch. The pulverulent batch is heated in a cellulating furnace to a foam-like mass which is comminuted to form a precellulated material. The precellulated material is mixed with additional cellulating agent and pulverulent batch in preselected proportions and heated in a furnace to gasify the cellulating agent to form a cellular body. Alternatively alumina, boric oxide, an alkali metal salt and a cellulating agent are comminuted and mixed in a ball mill. Thereafter, amorphous silica is added to form a mixture containing more than 80% silica. The mixture is milled in the ball mill and subjected to a temperature only sufficient to coalesce the mixture and gasify the cellulating agent to form a cellular body.

REFERENCES:
patent: 2582852 (1948-06-01), Shoemaker
patent: 3362805 (1968-01-01), Schulz
patent: 3874861 (1975-04-01), Kurz

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