Glass-ceramic article process for its production and...

Details Glass-ceramic article process for its production and... Glass-ceramic article process for its production and...

C - Chemistry, Metallurgy

03

C

261/16

C03C 3/085 (2006.01) C03C 3/112 (2006.01) C03C 10/16 (2006.01)

Patent

CA 1277339

Abstract of the Disclosure This invention relates to the preparation of highly crystalline glass-ceramic articles wherein potassium fluorrichterite constitutes essentially the sole crystal phase. The precursor glasses can be crystallized in situ very rapidly and exhibit very little thermal defor- mation during the crystallization heat treatment. The base glasses are essentially free of Li2O and consist essentially, expressed in terms of weight percent on the oxide basis, of: SiO2 61-70 Na2O 1.5-3 A1203 2.75-7 K2O 2.5-S MgO 12.5-16 Na2O+K2O <7 CaO 4.75-9 F 2-4

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