Spontaneously-formed nepheline-carnegieite glass-ceramics

Details Spontaneously-formed nepheline-carnegieite glass-ceramics Spontaneously-formed nepheline-carnegieite glass-ceramics

1975-03-19

1977-01-04

Douglas, Winston A.

Glass manufacturing

Processes

Devitrifying glass or vitrifying crystalline glass

106 396, C03B 3200, C03C 322

Patent

active

040009980

ABSTRACT:
The instant invention relates to the manufacture of articles demonstrating the physical properties and internal microstructure of glass-ceramic bodies but which can be formed spontaneously from molten glass. Thus, the heat treatment of a precursor glass body, such as is required in the production of conventional glass-ceramic articles to cause the crystallization in situ thereof, is avoided. More particularly, this invention relates to the manufacture of highly crystalline glass-ceramic articles having compositions within the Na.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 field, wherein carnegieite and/or nepheline solid solution crystals constitute the predominant crystal phase, which can be formed spontaneously from a molten glass batch.

REFERENCES:
patent: 3146114 (1964-08-01), Kivlighn
patent: 3473937 (1969-10-01), Tashiro
patent: 3573073 (1971-03-01), Duke et al.
patent: 3720526 (1973-03-01), Duke et al.
patent: 3790430 (1974-02-01), Mochel
patent: 3804608 (1974-04-01), Gaskell et al.

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