ti、niti合金表面hacol复合层的制备

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1、中文摘要本文通过在模拟体液中加入胶原，在Ti、NiTi合金表面生长HA／COL复合层，即成分、结构等与骨组织类似的仿生复合层，进一步扩大Ti、NiTi合金作为硬组织植入或替换材料在生物医学领域的应用。通过改变胶原及模拟体液的浓度确定了在Ti、NiTi合金表面生长HA／COL复合层的工艺；通过扫描电子显微镜(SEM)、X射线衍射(Ⅺ①)、红外光谱(m)、X射线光电子能谱(XPS)和透射电子显微镜仃EM)对表面复合层进行了表征；并初步探讨了Ti、NiTi合金表面HA／COL复合层的生长机理。结果表明；在Ti、NiTi合金表面生长HA／COL复合层的工艺为：在0．59,／L的CSBF溶

2、液中生长12．24h；在1．09／L的1．5CSBF溶液中生长3d。Ti、NiTi合金表面的复合层主要由结晶度较低的羟基磷灰石和胶原组成。根据生物矿化的原理和过程，Ti、NiTi表面H～CoL复合层的生长过程分为预成核、晶体成核和晶体生长三个阶段。预成核在试样表面形成了带负电荷的微结构和磷酸钙盐的初始晶核；在胶原的调控下，无机相在有机／无机界面成核：晶核在胶原以及溶液中离子的运送速率和结合速率的影响下生长，最终在试样表面形成羟基磷灰石和胶原的复合层。关键词。Ti；NiTi；HA／COL复合层；仿生生长；生物矿化ABSTRACTThisworkismalayattributedto

3、formHA／COLcompositecoatingsonthesurfaceofTiandNiTialloyby甜mngcollagenintoSBF(SimulatedBodyFluid)，ofwhichthecomponentands缸'ucturealesimilartothatofhumaIlbone．andfurtherenlargetheapplicationofTiandNiTialloyinthebiomedicalfieldashardissueimplantationorsubstitutematerials．FormationprocessesofHA／C

4、OLcompositecoatings011thesurfaceofTiandNiTialloywereconfirmedbyalteringtheconcentrationsofcollagenandCSBF,andthecharacteristicsofcompositecoatingswel'einvestigatedusingSEM，XRD，IR,XPSandTEM．Atthesanletime．thegrowthmechanismofHA／COLcompositecoatingsonthesurfaceofTiandNiTialloyWaSprimarilydiscus

5、sed．TheresultsindicatedthatformationprocessesofHA，cOLcompositecoatingsonthesurfaceofTiandNiTialloywererespectivelydepositingin0．59／LCSBFfor12·24handin1．Og／L1．5CSBFfor3d．11lecompositecoatingsontheSalrfaceofTiandNiTialloyweremainlycomposedofpoorlycrystallizedhydroxyapafiteO㈣andcollagen．Accordin

6、gtothetheoryandprocessofbiomimcticmineralization，thegrowthpmc髓sofHA／COLcompositecoatingsonthesurfaceofTiandNiTialloycallbedividedtothreestages，i．e．1yre-nucleation，crystalnucleationandcrystalgrowth．Firstly,electronegativestructureandprimarycrystalnucleusofcalciumphosphatewereformedonthesurface

7、ofalloy；theninorganicphasesw唧nucleatedontheorganic／inorganicinterfaceunderthecontrolandinfluenceofcollagen；andthencrystalsweregrowingundertheinfluenceofcollagenandthetransportandcombinationvelocitiesofionsinthesolution，andfinallyHA／COLcomposi