Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1978-04-14
1979-02-27
McCarthy, Helen
Compositions: coating or plastic
Coating or plastic compositions
Marking
65 33, C03C 322
Patent
active
041417399
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 et al.
patent: 3600204 (1971-08-01), Beall et al.
patent: 3689293 (1972-09-01), Beall
patent: 4070198 (1978-01-01), Chyung et al.
Chyung Kenneth
Wusirika Raja R.
Corning Glass Works
Janes Jr. Clinton S.
McCarthy Helen
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