Potassium fluorrichterite glass ceramics and method
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United States of America Patent
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Aug 21, 1984
Grant Date -
N/A
app pub date -
May 9, 1983
filing date -
May 9, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a highly crystalline glass-ceramic article exhibiting superior toughness against fracture propagation, a modulus of rupture in excess of 20,000 psi, a predominant crystal phase of potassium fluorrichterite, and having an overall composition consisting essentially of SiO.sub.2 : 50-70 CaO: 4-15 MgO: 8-25 F: 3-8 Na.sub.2 O: 2-9 K.sub.2 O: 2-12 Li.sub.2 O: 0-3 Al.sub.2 O.sub.3 : 0-7 Canasite may be a secondary phase, but a crystal phase composed essentially of potassium fluorrichterite is preferred for dinnerware.
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