The effect of sintering temperature on the structure and properties of calcium hexaluminate/anorthite ceramics

Y. Tian, Y. Qiu, Y. Chai, P. Bai, C. Gong
2013 Science of Sintering  
The calcium hexaluminate/anorthite composite are prepared by magnesia slag, kaolin and industrial alumina at different sintering temperature. The effect of sintering temperature on the structure and properties are investigated by X-ray powder diffraction and scanning electron microscopy. The results show that the calcium hexaluminate begins to form at 1300 o C and continues to form in a large amount between 1400 o C and 1500 o C, however, there is a phase transitions form gehlenite to anorthite
more » ... lenite to anorthite between 1300 o C and 1400 o C. CA 6 grow preferentially along the basal plane direction. When the crystals touch each other, the CA 6 crystals turn to grow up along the axial direction. The apparent porosity decreases and bulk density increases and the flexural strength increases with the rising of the sintering temperature.
doi:10.2298/sos1302141t fatcat:dktrtnrgvndbbdmkmouduostk4