The temperature variation, setting time, phase compositions and compressive strength of magnesium phosphate chemically bonded ceramics were important for its application in biomedical field. Different amounts of liquid were added into the premixed acid phosphate and oxide powders in order to study the effect of liquid-to-solid ratios on the properties of magnesium phosphate chemically bonded ceramics. The results indicated that the setting time increased and the maximum temperature decreased as the liquid-to-solid ratio increases. The hydrated product was mainly composed of magnesium potassium phosphate hexahydrate, which was not affected by the liquid-to-solid ratios. Besides, magnesia was also found because it was an obvious excess of the hydrated reaction. The compressive strength decreased as the liquid-to-solid ratios increase possibly because of the higher porosity caused by the superfluous liquid. According to the performed study, results indicated that the properties of MPCBC could be adjusted by changing the liquid-to-solid ratios.
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