Pulverulent borosilicate composition and a method of making a ce

Details Pulverulent borosilicate composition and a method of making a ce Pulverulent borosilicate composition and a method of making a ce

1978-02-15

1978-10-10

McCarthy, Helen

Glass manufacturing

Processes

With pore forming in situ

65 21, 106 40V, 204243R, 252 62, 428428, 106 54, 204279, C03B 1908

Patent

active

041194225

ABSTRACT:
An aqueous slurry comprising an intimate mixture of colloidal silica, (preferably an amorphous, precipitated, hydrated silica), caustic potash, boric acid and alumina is first prepared and then dried. The dried aggregates are thereafter crushed, calcined and rapidly quenched. It is preferred to dry the slurry in a spray drier and thereafter omit crushing after drying and to calcine the dried admixture by means of a plasma arc so that the mixture is rapidly quenched after calcination. The calcined mixture is introduced into a crusher, such as a ball mill, with a carbonaceous cellulating agent and reduced to a fine pulverulent material. The pulverulent material is then cellulated in a cellulating furnace to form cellular borosilicate bodies. Where desired, the calcined material may be utilized as a ceramic frit.

REFERENCES:
patent: 3323888 (1967-06-01), Searight
patent: 3408222 (1968-10-01), Navias
patent: 3441396 (1969-04-01), D'Eustachio et al.
patent: 3699050 (1972-10-01), Henderson
patent: 3762936 (1973-10-01), Iler
patent: 3793039 (1974-02-01), Rostoker
patent: 3827893 (1974-08-01), Meissiver et al.
patent: 3929439 (1975-12-01), Pierce
patent: 4075025 (1978-02-01), Rostoker

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