Fabrication of apatite coating on single crystal silicon by sol-gel method

Apatite (AP) coating was fabricated on single crystal silicon (SCS) by sol-gel method. SEM,EDS and XRD were applied to investigating the morphologies and compositions of coatings formed on SCS. SBF soaking was carried out to test the inductive ability of the obtained AP coating for bone-like apatite. Results show that sol-gel precursor coating can be transformed into dense HA coating at 500℃ for 2h,and bigger AP crystals form the coating with interstitial structure after calcination at 700 and 800℃,respectively. Crystallinity of HA coating is improved with the increase of calcination temperature and no decomposition of AP is observed at 800℃. Soaked in SBF for one week,AP coating is not desquamated from SCS. Formation of bone-like apatite identifies good in vitro inductive ability on sol-gel derived AP coating on SCS.