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Evaluation of the Degree of Crystallisation in Glass-Ceramics by Density Measurements, J. European Cer. Soc., 19 [5], 1999, 649-654
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Induced crystallization porosity and properties of sintereds diopside and wollastonite glass-ceramics
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Sintering behaviour and properties of iron-rich glass-ceramics
No full textIron-rich glass-ceramics were obtained by the sintering of two glass powders, labeled G1 and G2, at heating rates of 5° and 20°C/min followed by an isothermal step in the 850°-1050°C temperature interval. The sintering process was evaluated by the linear shrinkage; the closed porosity was estimated by density measurements; the structure and the morphology of the glass ceramics were observed by scanning electron microscopy. The bending strength, the Young modulus, and Vickers hardness of the glass-ceramics materials were evaluated. The results showed that the sintering process and morphology of the glass-ceramics depends on the amount of magnetite and pyroxene formed. With a low percentage of crystal phase formed (25%-30% typical of G1) the structure is characterized by closed porosity; at higher crystallization (45%-50% typical of G2) open porosity is mainly formed. The properties of the glass-ceramics were not influenced by the heating rate but improved with an increase in the degree of crystallizatio
Sintered Glass-Ceramics from MSW-Incinerator Fly Ashes. Part 1:The influence of the heating rate on the sinter-crystallisation
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