Glass manufacturing – Processes – Operating under inert or reducing conditions
Patent
1979-08-02
1980-09-16
McCarthy, Helen M.
Glass manufacturing
Processes
Operating under inert or reducing conditions
65 33, 106 396, 106 397, 106 731, 106 732, 106 734, 106 735, C03B 3200, C03C 322
Patent
active
042227607
ABSTRACT:
The instant invention is directed to the production of glass-ceramic articles from thermally crystallizable glass compositions containing, by weight, about 40-85% SiO.sub.2 and 2.5-17% N as basic constituents and utilizing such modifiers as the alkali metals, the elements of Groups IIA and IIB of the Periodic Table, boron, and aluminum to obtain practical glass-forming compositions. In general, at N contents greater than about 3.5%, the predominant crystal phase developed in situ will customarily comprise "nitrogen mullite", silicon oxynitride (Si.sub.2 ON.sub.2), and/or .beta.'-Si.sub.3 N.sub.4 solid solution. The crystal phase which has been denominated in the literature as "nitrogen-mullite" has a lath-like morphology and, hence, is useful in reinforcing the crystalline body. Where the predominant crystal phase comprises a silicate, it is believed that nitrogen is present in some manner within the silicate crystal structure. The parent thermally crystallizable glasses appear to be self-nucleating, i.e., the addition of a conventional nucleating agent such as TiO.sub.2, ZrO.sub.2, or SnO.sub.2 is not required to cause crystallization in situ. It is postulated that N may function as a nucleating agent.
REFERENCES:
patent: 2920971 (1960-01-01), Stookey et al.
patent: 3582307 (1971-06-01), Mulfinger
patent: 4097295 (1978-06-01), Chyung et al.
Umebayashi, S. et al. "B-Si.sub.3 N.sub.4 Solid Solution Prepared from Volcanic Ash and Al Powder in N.sub.2 "-J. Am. Cer. Soc. 58 (9-10) 1975, p. 464.
Chyung Kenneth
Wusirika Raja R.
Corning Glass Works
Janes Jr. Clinton S.
McCarthy Helen M.
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