Effect of Al <sub>2</sub> O <sub>3</sub> Content on Crystallization Behavior, Microstructure, and Mechanical Properties of SiO <sub>2</sub> –Al <sub>2</sub> O <sub>3</sub> –CaO–MgO Glass–Ceramics
Annotatsiya
The crystallization of glasses with general composition (61.87− x ) %SiO 2 , x %Al 2 O 3 , 22.01% CaO, 6.24% MgO, 2.54% Na 2 O, 2.72% K 2 O, 0.58% TiO 2 , 3.34% Fe 2 O 3 , and 0.7% Cr 2 O 3 (wt%) where x varies between 0% and 22% was investigated using differential thermal analysis, X‐ray diffraction analysis, and scanning electron microscopy. The increase of Al 2 O 3 content at the expense of SiO 2 had a marked effect on the mechanism of crystallization and microstructure of glass–ceramics. The glass specimen containing 18 wt% Al 2 O 3 demonstrating the most efficient bulk nucleation and an activation energy and Avrami exponent of 243±11 kJ/mol and 3.8±0.3, respectively, exhibited a fine microstructure, comprising <0.5 μm particles of diopside, showed a bending strength of 122±9 MPa.
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