Production of glass-ceramic articles

Details Production of glass-ceramic articles Production of glass-ceramic articles

1976-05-18

1977-08-16

Bashore, S. Leon

Glass manufacturing

Processes

Devitrifying glass or vitrifying crystalline glass

106 396, 106 397, 106 398, C03B 3200, C03C 322

Patent

active

040423620

ABSTRACT:
The instant invention is concerned with a unique method for crystallizing glass bodies into glass-ceramic articles. More particularly, this invention is drawn to a method whereby glass-ceramic articles can be formed without cooling the precursor glass below the transformation range thereof. Thus, the glass melt is cooled and formed into a vitreous body. This vitreous body is cooled to a temperature no lower than about 25.degree.-250.degree. C. above the transformation range where nucleation is developed therewithin. Essentially immediately thereafter, the nucleated body is exposed to a temperature between about 100.degree.-500.degree. C. higher than that of the nucleation step to cause the growth of crystals on the nuclei. The process significantly expedites the production of glass-ceramic articles and substantially reduces energy consumption from the forming stage to the finished product.

REFERENCES:
patent: 3798014 (1974-03-01), Bondarev et al.
patent: 3839053 (1974-10-01), Rittler
patent: 3847582 (1974-11-01), Kozmin et al.
patent: 3899340 (1975-08-01), Malmendier
patent: 3907577 (1975-09-01), Kiefer et al.
patent: 3926602 (1975-12-01), Andrus et al.
patent: 3929497 (1975-12-01), Monks

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