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1、AdvancedMaterialsResearchOnline:2011-03-30ISSN:1662-8985,Vols.217-218,pp88-92doi:10.4028/www.scientific.net/AMR.217-218.88©2011TransTechPublications,SwitzerlandPreparationandCharacterizationof(HAp/SiO2)/TiBiocomposites1,2,a21,2,bXueZhang,Zhi-MengXiu,Xiao-WuLi1InstituteofMaterial
2、sPhysicsandChemistry,CollegeofSciences,P.O.Box104,NortheasternUniversity,Shenyang110004,P.R.China;2TheKeyLaboratoryforAnisotropyandTextureofMaterials,MinistryofEducation,NortheasternUniversity,Shenyang110004,P.R.Chinaabxianyiz@163.com,xwli@mail.neu.edu.cnKeywords:Hydroxyapatite,
3、Silica,Titanium,Biocomposite,BioactivityAbstract.(HAp/SiO2)/Tibiocompositeswerepreparedbythepowdermetallurgymethod.Thephasecompositionsandtheinvitrobioactivityofsuchbiocompositesweresystematicallychar-acterized.TheXRDresultshowsthatthephasecompositionsof(HAp/SiO2)/Ticompositesar
4、emainlycomposedofCa4O(PO4)2(TTCP),Ti,TiO2andCaO.Thesynthesized(HAp/SiO2)/Tibi-ocompositesexhibitagoodbioactivity,forexample,afterthesamplesareimmersedinSBFsolu-tiononlyfor24hours,thebone-likelayerconsistingofsphericalapatitecrystalclustershasde-positedonthesurfaceofthesamples.Th
5、edensityandthicknessoftheapatitelayerincreaseswithincreasingimmersiontime.Theformationprocessandmechanismsofbone-likeapatitelayerarealsodiscussed.IntroductionHydroxyapatite(HAp)hasbeenwellestablishedasanidealmedicalimplantmaterialduetoitssimilarityinchemicalcompositiontotheinorg
6、aniccomponentofhumanhardtissuesandbio-compatibilitywithhumanbone[1].However,thepureHApimplantexhibitssomeobviousdis-advantages,suchasitsslowrateofnewboneapposition,poormechanicalpropertiesandetc.[2].Infact,theapatitecrystalstructuresofbonetissuearesubstitutedbydifferentkindsofio
7、ns,such4+2-2+4+asSi,CO3,andMg[3].Differentions(e.g.,Si)wouldplayimportantrolesinthehardtis-sueformation.Earlyin1970,Carlisleetalhavealreadydemonstratedtheimportanceofsiliconinboneformationandcalcification[4].Currently,variouspreparationmethodsofbiocompositesofSi-substitutedHApwe
8、redeveloped[5-9],anditwasfoundthatSi-HAphasahig
