Opal glasses prepared through clay vitrification

Details Opal glasses prepared through clay vitrification Opal glasses prepared through clay vitrification

1976-08-09

1977-04-12

Bashore, S. Leon

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 27, 65 30E, 65 33, 106DIG8, 106 67, 106 72, 106 73, 264 22, 264 66, C03B 2320, C04B 3313, C04B 700

Patent

active

040172899

ABSTRACT:
The instant invention is directed to the production of opal glasses through the solid state vitrification of certain bentonite-type clays. The process involves five general steps: (1) the clay is ion exchanged at low temperatures in aqueous solutions; (2) the ion exchanged clay is thoroughly washed with water; (3) the ion exchanged clay is preferably heated at moderate temperatures to expedite removal of the water; (4) the dehydrated clay is shaped into a body of a desired configuration; and (5) the shaped body is fired to vitrification utilizing a defined sintering schedule. The resulting body is a white or off-white opal glass containing minor amounts of crystal phases. Uniformly colored glasses can be prepared employing such conventional glass coloring agents as chromium, cobalt, copper, nickel, vanadium, etc. The process possesses the practical advantages of inexpensive batch materials, the elimination of the need for glass melting facilities, and low energy consumption in forming glass articles.

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