Glass manufacturing – Processes – Devitrifying glass or vitrifying crystalline glass
Patent
1974-08-05
1976-02-24
McCarthy, Helen M.
Glass manufacturing
Processes
Devitrifying glass or vitrifying crystalline glass
106 396, 106 397, 106 398, C03C 322
Patent
active
039402550
ABSTRACT:
A cordierite-type glass-ceramic and a process for its preparation are disclosed, characterized in that a nucleating agent in a small amount is added preferably to a glass batch capable of producing cordierite. The nucleating agent aids in forming a glass-ceramic refractory of relatively large amounts of crystalline cordierite. The melt is quenched and ground to an average particle size no greater than about minus 325 U.S. Standard sieve. This particle size in combination with a relatively small amount of a nucleating agent has been found to increase the amount of cordierite formed during crystallization and simultaneously decrease the amount of glassy phase remaining in the glass-ceramic. In this manner, the ultimate product more nearly resembles pure cordierite. The nucleating agent includes the compounds, usually the oxides, of Mo, Ta, Zr, Nb, Ti, Li, As, and mixtures thereof. The preferred nucleating additive or agent is Nb.sub.2 O.sub.5. The present refractories may have a coefficient of thermal expansion less than 1.60 .times. 10.sup.-.sup.6 inch/inch/.degree.C from room temperature to about 600.degree.C as determined by the Orton dilatometer.
REFERENCES:
patent: 2920971 (1960-01-01), Stookey
patent: 3113877 (1963-12-01), Janakirama-Rao
patent: 3275493 (1966-09-01), MacDowell
patent: 3282711 (1966-11-01), Lin
patent: 3389458 (1968-06-01), Ostrander et al.
patent: 3450546 (1969-06-01), Stong
patent: 3464806 (1969-09-01), Seki et al.
patent: 3464880 (1969-09-01), Rinehart
patent: 3473936 (1969-10-01), Smith
patent: 3480452 (1969-11-01), Fleischner
patent: 3775164 (1973-11-01), Smith et al.
Beal Donald F.
Harrington Roy V.
Ferro Corporation
McCarthy Helen M.
Simmons Milton L.
Taylor Wesley B.
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