Consequently, the Ca P supersaturation and the ion activity product of apatite increased and this stimulated the nucleation and growth of the apatite crystals and the formation of apatite coatings.

• Ca2 + 离子又能使表面附近的pH值增大 ,Ca2 + 离子和HPO2 -4离子的活度积就增大 ,从而刺激了磷灰石晶体的成核与长大 ,最终形成表面磷灰石涂层