A dense CHA layer is formed on the surface of dicalcium silicate coating soaked in SBF solution for 2 days.

• 硅酸二钙涂层浸泡在模拟体液中两天后，表面被致密的球形磷灰石晶体（CHA）覆盖，在磷灰石层之下可观察到明显的富硅层。