Microstructure and properties of high alumina castables containing calcium alumino-titanate

作者：Chen, Jianwei; Zhao, Huizhong; Zhang, Han^*; Li, Zhengkun; Zhang, Jiaqin

来源：International Journal of Applied Ceramic Technology, 2018, 15(6): 1478-1483.

DOI：10.1111/ijac.13016

• microstructure
• refractories
• scanning electron microscopy

Calcium alumino-titanate (CAT)-containing high alumina castables were prepared using bauxite, CAT, and -Al2O3 as starting materials, and subsequently heat treated at various temperatures ranging from 1400 degrees C to 1600 degrees C. The thermo-mechanical properties of the specimens as a function of the temperature were characterized in terms of linear shrinkage, bulk density, apparent porosity, cold crushing strength (CCS), modulus of rupture (MOR), residual ratio of MOR, and coefficient of thermal expansion (CTE). X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to determine the phase composition and microstructural evolution, respectively. Sintering at temperatures between 1450 and 1500 degrees C promoted normal grain growth, with the formation of a granular surface contact, and abnormal grain growth occurred at higher temperatures (1550 degrees C). The cold strength of the specimen initially increased and subsequently decreased with temperature, whereas the residual ratio of MOR initially decreased with increasing temperature to 1550 degrees C, then increased above 1550 degrees C. In addition, the CTE of the specimen was only minimally influenced by the firing temperature.

• 出版日期2018-11
• 单位武汉科技大学