Preparation of basalt-based glass ceramics
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Local and conventional raw materials-massive basalt from the Vrelo locality on Kopaonik mountain-have been used as starting materials to test their suitability for the production of glass-ceramics. Crystallization phenomena of glasses of the fused basalt rocks were studied by X-ray phase analysis. optical microscopy and other techniques. Various heat treatments were used, and their influences. on controlling the microstructures and properties of the products were studied with the aim of developing high strength glass-ceramic materials. Diopside CaMg(SiO3)(2) and hypersthene ((Mg,Fe)SiO3) were identifies as the crystalline phases. The final products contained considerable amounts of a glassy phase. The crystalline size was in range of 8-480 mum with plate or needle shape. Microhardness, crashing strength and wears resistence of the glass-ceramics ranged from 6.5-7.5, from 2000-6300 kg/cm(2) and from 0.1-0.2 g/cm, respectively.