Crystallization of CaO-Al2O3-SiO2 and CaO-MO-Al2O3-SiO2 (M=Mg, Zn) glasses

Monteiro, R. C. C., F. P. Glasser, and E. E. Lachowski. "Crystallization of CaO-Al2O3-SiO2 and CaO-MO-Al2O3-SiO2 (M=Mg, Zn) glasses." Journal of Materials Science. 24 (1989): 2839-2844.


A range of CaO-Al2O3-SiO2 glasses have been prepared by fusion of pure starting materials in platinum crucibles. Compositions containing large amounts on network formers, Al2O3 and SiO2, are difficult to crystallize. If the amount of network former is reduced, glasses will self-nucleate and crystallize more readily, but the products of crystallization tend to react with water. This conflict has been partly resolved by adding MgO and ZnO and tailoring compositions so as to produce a phase, variously designated "Q" or "pleochroite", ideally Ca20Al32-2 vMg vSivO68, with v close to 4. Pleochroite crystallizes with a typically fibrous morphology. Preliminary experiments on fragments and melt-cast glass rods indicate that these compositions can be heat treated without deformation to yield highly crystalline, transparent ceramics. © 1989 Chapman and Hall Ltd.


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