Preparation and Properties of MgAl2O_4-CaAl_(12)O_(19) High Temperature Composite

摘要

The utilization of lightweight refractories plays an important role in reducing the energy consumption of industrial furnaces. In this paper, MgAl2O_4-CaAl_(12)O_(19) high temperature composite was synthesized via solid-state reaction using magnesite, dolomite and industrial alumina as raw materials. The influences of raw materials and reaction temperature on phase compositions and microstructure of the composite were investigated by XRD and SEM, respectively. The parameters to prepare MgAl2O_4-CaAl_(12)O_(19) high temperature composite were optimized. The results show that the optimum reaction conditions for synthesizing MgAl2O_4-CaAl_(12)O_(19) composite is the CA_6/MA weight ratio of 2:3, and the reaction temperature of 1500°C for 4h. The CaAl_(12)O_(19) crystals showed laminated or plate-like structure, and the MgAl2O_4 showed spherical morphology. The reaction temperature had little effect on the phase compositions of MA-CA6 composite in this experiment. The content of Al_2O_3 in the raw material affected the phase composition of MA-CA_6 composite.With the increase of the CaAl_(12)O_(19) amount, the bending strength of the composite decreased.