Silica-alumina-nitrogen containing glasses for production of gla

Details Silica-alumina-nitrogen containing glasses for production of gla Silica-alumina-nitrogen containing glasses for production of gla

1977-10-20

1978-06-27

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

65 32, 65 33, 65134, 106 396, 106 397, 106 54, 106 734, 106 735, C03C 304, C03C 308

Patent

active

040972950

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: 3582307 (1971-06-01), Mulfinger
patent: 4070198 (1978-01-01), Chyung et al.
Mulfinger, H. -- "Physical & Chemical Solubility of Nitrogen in Glass Melts" -- J. Am. Cer. Soc. 49(9), 1966, pp. 462-467.
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.

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