Glass compositions containing oxygen and nitrogen and production of nitroceramics/vetroceramics composites therefrom
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United States of America Patent
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Nov 24, 1992
Grant Date -
N/A
app pub date -
Oct 18, 1990
filing date -
Oct 18, 1989
priority date (Note) -
Expired
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Abstract
Glass compositions containing oxygen and nitrogen prepared by melting admixture of magnesia and/or a magnesium silicate, silica and an aluminum nitride produced by reacting ammonia with aluminum oxide, have the formula: Mg.sub.x Si.sub.y Al O.sub.u N.sub.v (1) in which 0.25.ltoreq.x.ltoreq.2.50, 1.25.ltoreq.y.ltoreq.3.50, 3.75.ltoreq.u.ltoreq.10.50, and 0.05.ltoreq.v.ltoreq.0.75, with the proviso that 2x+4y+3=2u+3v; the subject glass compositions are thermally converted into vitroceramics having the same formula and including a single cordierite crystalline phase, which vitroceramics are well adapted for the production of composite shaped articles.
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