Porous glass, process for its production and glass material used

Details Porous glass, process for its production and glass material used Porous glass, process for its production and glass material used

1985-10-17

1987-05-12

Lander, Ferris H.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 59, 501 66, 501 67, C03C 1100

Patent

active

046650393

ABSTRACT:
A process for producing a porous glass which comprises forming a shaped product of borosilicate glass having a predetermined shape, heat-treating the shaped product for phase separation to form a silica rich insoluble phase and an alkali and boric oxide rich soluble phase, leaching out the soluble phase from the insoluble phase with an acid or an alkali to obtain a porous glass, wherein said shaped product of borosilicate glass is composed essentially of from 45 to 67% by weight of SiO.sub.2, from 0.5 to 10% by weight of Al.sub.2 O.sub.3, from 10 to 30% by weight of B.sub.2 O.sub.3, from 0.5 to 8% by weight of Na.sub.2 O, from 0.1 to 8% by weight of K.sub.2 O+Li.sub.2 O+Cs.sub.2 O, from 0.5 to 7% by weight of CaO, from 0.5 to 15% by weight of MgO+BaO+SrO, from 0 to 10% by weight of ZrO.sub.2 +TiO.sub.2 and from 0.03 to 3% by weight of F+SO.sub.3 +Cl+As.sub.2 O.sub.3 +Sb.sub.2 O.sub.3.

REFERENCES:
patent: 2221709 (1938-01-01), Hood et al.
patent: 2494259 (1950-01-01), Nordberg
patent: 3513106 (1970-05-01), Chapman et al.
patent: 3549524 (1970-12-01), Haller
patent: 4438211 (1984-03-01), Mennemann et al.
Kreidl, "Borosilicate Glasses", in Glass, Science and Technology, Ed. by D. R. Uhlman and N. J. Kreidl, (New York, Academic Press, 1983), pp. 171-178.

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