Sintered glass body with opaquely mottled pattern and method of

Details Sintered glass body with opaquely mottled pattern and method of Sintered glass body with opaquely mottled pattern and method of

1988-12-23

1991-04-23

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 17, 501 18, C03C 106

Patent

active

050100424

ABSTRACT:
The invention relates to a substantially foamless sintered glass body with a decorative pattern. The glass body is made of a glass and a powder of at least one heat-resistant inorganic oxide, e.g. aluminum oxide, which is colorless or assumes a whitish color and has a refractive index different from that of the glass by at least 15%, and the glass body contains an inorganic pigment. The oxide powder amounts to 0.2-10 wt % of the glass. The glass body has, in its surfaces and sections, opaline or opaque and palely colored mottles bordered by less opaque and relatively deeply colored regions. The glass body is produced by compressively granulating a powder mixture of the glass, inorganic oxide(s) and pigment into granules not smaller than 1 mm, integrating the granules, firing the integrated granules at a temperature ranging from the softening point to the fluid point of the glass and applying a pressure to the fired material during or immediately after firing. The mottle size in the sintered glass body depends on the granule size of the fired material, and opaqueness of the mottles is attributed to the light diffusing effect of the oxide powder.

REFERENCES:
patent: 4331768 (1982-05-01), Boyd et al.
patent: 4818731 (1989-04-01), Mizutani et al.

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