Effect of Heat-Treatment on Microstructure and Mechanical Properties of Magnesium Phosphate Cement

Magnesium phosphate cement with M/P of 6, borax content of 4.8 wt% and water-to-cement ratio of 0.12, were made in this study. Heat-treatment was conducted from 200 °C to 1200 °C, and the physical and chemical evolution in the process of heating up was investigated via TG/DSC, XRD and SEM. Besides, the compressive strength, density and porosity of the heat-treated specimen were measured and the influence of treating temperature was discussed. The results show that magnesium phosphate cement possesses good chemical stability at 1200 °C and the strength has reduced only by 32.2% compared with none-treating specimens.