Abstract
The glass ceramics were prepared from coal fly ash, limestone, and Na2CO3 by sintering processes. Effects of the crystallization temperature (850–1,100 °C) on crystallization behavior, microstructure, sintering character, and chemical stability of the glass-ceramics samples were analyzed by the means of DTA, XRD, SEM, and other analytical methods. The results show that the main crystalline phase of as-prepared glass ceramics after crystallization treatment is gehlenite (Ca2Al2SiO7). The species of crystalline phases remain the same; however, the main crystalline intensity, line shrinkage rate, and bulk density increase first and then decrease with the increasing of heat treatment temperature. Water absorption of the samples was reduced as the heat treatment temperature rises. The glass ceramics display high-performance crystallization properties and chemical stability. The optimized glass ceramics with desired sintering character and chemical stability were obtained by crystallization at 1,050 °C.
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