Fig. 4

SEM and XRD of BCPs and surface mineralized BCPs. a–c General and SEM observation of BCPs. d The porosity of BCPs and surface mineralized BCPs. e–g General and SEM observation of surface mineralized and BCPs. h Mechanical compression testing. i–j XRD of BCPs and surface mineralized and BCPs. *P < 0.05, and those with no symbol show no significant difference.