Sol_gel derived HATiO_2 double coatings on Ti scaffolds for orthopaedic applications

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1、Sol-gelderivedHA/TiO2doublecoatingsonTiscaffoldsfororthopaedicapplications111122XUW,HUWY,LIMH,MAQQ,P.D.HODGSON,WENCE1.DepartmentofAppliedPhysics,HunanUniversity,Changsha410082,China;2.CentreforMaterialandFibreInnovation,DeakinUniversity,GeelongVic3217,AustraliaReceived10April2006;accepted

2、25April2006Abstract:Hydroxyapatite/titania(HA/TiO2)doublelayerswerecoatedontoTiscaffoldsthroughoutfororthopaedicapplicationsbysol-gelmethod.Differentialscanningcalorimetry(DSC),thermogravimetricanalysis(TG)andX-raydiffractometry(XRD)wereusedforthecharacterisationofthephasetransformationso

3、fthedriedgelsandcoatedsurfacestructures.Scanningelectronmicroscope(SEM)equippedwithenergydispersivespectrometry(EDS)wasusedfortheobservationandevaluationofthemorphologyandphasesofthesurfacelayersandfortheassessmentoftheinvitrotests.TheinvitroassessmentswereperformedbysoakingtheHA/TiO2doub

4、lecoatedsamplesintothesimulatedbodyfluid(SBF)forvariousperiods.TheTiO2layerwascoatedbyadipping-coatingmethodataspeedof12cm/min,followedbyaheattreatmentat600℃for20min.TheHAlayerwassubsequentlydipping-coatedontheoutersurfaceatthesamespeedandthenheat-treatedatdifferencetemperatures.Theresult

5、sindicatthattheHAphasebeginstocrystallizeafteraheattreatmentat560℃.Thecrystallinityincreasesobviouslyat760℃.SEMobservationsfindnodelaminationorcrackattheinterfacesofHA/TiO2andTiO2/Ti.TheHA/TiO2coatedTiscaffoldsdisplaysexcellentbone-likeapatiteformingabilitywhenitissoakedintoSBF.Tiscaffold

6、safterHA/TiO2doublecoatingscanbeanticipatedaspromisingimplantmaterialsfororthopaedicapplicationsKeywords:Tiscaffolds;sol-gelmethod;Hydroxyapatite;Titania;HA/TiO2coatings;simulatedbodyfluidmodulicanbetailoredtobeveryclosetothoseof1Introductioncancellousbones[6].Suchkindofcommensurateelasti

7、cmodulicanbeexpectedtoeliminatethestressshieldingBoneinjuriesandfailuresoftenrequiretheeffect,whichmayleadtothefailureoftheimplantinceptionofimplantbiomaterials.Researchesinthisareamaterial.Itisthuspossible,thatTialloyanditsscaffoldsarereceivingincreasingattentionwo