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将HA粉末添加质量比为70%的Ti粉,压制成坯后在大气环境下900℃、1000℃、1100℃保温60 min烧结制备HA/Ti复合材料,用金相显微镜(OM)、扫描电子显微镜(SEM)和X射线衍射仪(XRD)对复合材料进行组织、形貌和结构表征,采用模拟体液浸泡(SBF)进行体外生物活性表征。结果表明:材料物相主要为α-Ti、Ca_(10)(PO_4)_6(OH)_2、TiO_2和β-Ca_3(PO_4)_2;当温度达到1000℃时有CaTiO_3生成,当温度升高到1100℃时生成CaO;1100℃时,块状TiO_2及α-Ti弥散分布于由陶瓷相等形成的网状结构中。CaO、TiO_2的生成和网状微孔结构对促进HA异质形核有重要作用,经14天SPF溶液浸泡后表面形成利于成骨的Ca_(10)(PO_4)_6(OH)_2、CaTiO_3和β-Ca_3(PO_4)_2。孔径尺寸与允许骨组织长入的临界孔径尺寸相当。
HA powder was added into Ti powder with a mass ratio of 70%, then pressed into billets and sintered at 900 ℃, 1000 ℃ and 1100 ℃ for 60 min in the atmosphere. The HA / Ti composites were prepared by metallographic microscope (OM), scanning electron The morphology, morphology and structure of the composites were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The in vitro biological activity was characterized by simulated somatic fluid immersion (SBF). The results show that the material phases are mainly composed of α-Ti, Ca_ (10) (PO_4) _6 (OH) _2, TiO_2 and β_Ca_3 (PO_4) _2. When the temperature reaches 1000 ℃, CaTiO_3 is formed. At 1100 ℃, CaO was formed. At 1100 ℃, the bulk TiO 2 and α-Ti dispersed in the network structure formed by the same ceramic. The formation of CaO and TiO_2 and the reticular micropore structure play an important role in promoting the heterogeneous nucleation of HA. After being soaked in SPF solution for 14 days, the osteoblastic Ca_ (10) (PO_4) _6 (OH) _2, CaTiO_3 and β-Ca_3 (PO_4) _2. The pore size is comparable to the critical pore size that allows for the ingrowth of bone tissue.