Calcium Carbonate → Tetracalcium phosphate

Participants

Reaction Steps

Cement preparation: TTCP (tetracalcium phosphate) was prepared by sintering an equimolar mixture of DCPA (dicalcium phosphate anhydrous) (Baker) and calcium carbonate (Baker) at 1500° C. for 18 h followed by quenching in air, followed by milling in agate jars to a d50 of 15 μm. DCPA was milled in 96% ethanol by means of a ball mill for 24 h to a d50 of 0.7 μm. TTCP and DCPA were mixed at a nearly equimolar ratio (0.91), weight ratio 7:3 in a ball mill for 1 h. 0.97 weight % of dry sodium phosphate accelerator was mixed with the cement to adjust the initial setting time according to the Gilmore-needle test to about 5 min at 37° C.

Provenance & Evidence