Multilayer foam glass with dense glass surface layer and method

Details Multilayer foam glass with dense glass surface layer and method Multilayer foam glass with dense glass surface layer and method

1988-03-18

1989-05-23

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283122, 4283126, 4283186, B32B 326, B32B 1700, B32B 520

Patent

active

048330159

ABSTRACT:
The invention relates to a foam glass block provided with a dense glass surface layer. To solve a problem that adhesion of the dense glass layer to the foam glass layer is insufficient, a relatively thin intermediate layer of porous glass is interposed between the basic foam glass layer and the dense glass layer. The intermediate layer has apparent specific gravity of 0.8-1.8, whereas the basic foam glass layer is lower than 0.8 in apparent specific gravity. The multilayer foam glass block is produced by simultaneously firing a granulated material of the basic foam glass, a granulated material of the intermediate porous glass and a particulate material of the dense glass in layers, or by firing a granulated material of foam glass and a particulate material of dense glass in layers and pressing the upper surface of the dense glass during or soon after firing. The outer surface of the dense glass layer may be formed with a number of fine cracks or a number of small semispherical protuberances to produce an ornamental effect.

REFERENCES:
patent: 3709772 (1973-01-01), Rice
patent: 4552800 (1985-11-01), Blasch et al.

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