Hydroxyapatite(HA) can be produced from dicalcium phosphate anhydrous(DCPA) and calcium carbonate by synthesis, then it decomposes tetracalcium phosphate(TTCP) at higher temperature.

• 本文讨论了直接固相反应法制备磷酸四钙的工艺过程 ,证明原料在煅烧过程中先生成了羟基磷灰石 ,接着在更高的温度由羟基磷灰石分解产生磷酸四钙。