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Porous NiTi shape memory alloys produced by SHS: microstructure and biocompatibility in comparison with Ti_2Ni and TiNi_3

机译:SHS生产的多孔NiTi形状记忆合金:与Ti_2Ni和TiNi_3相比的微观结构和生物相容性

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摘要

Shape memory alloys based on NiTi have found their main applications in manufacturing of new biomedical devices mainly in surgery tools, stents and orthopedics. Porous NiTi can exhibit an engineering elastic modulus comparable to that of cortical bone (12-17 GPa). This condition, combined with proper pore size, allows good osteointegration. Open cells porous NiTi was produced by self propagating high temperature synthesis (SHS), starting from Ni and Ti mixed powders. The main NiTi phase is formed during SHS together with other Ni-Ti compounds. The biocompatibility of such material was investigated by single culture experiment and ionic release on small specimen. In particular, NiTi and porous NiTi were evaluated together with elemental Ti and Ni reference metals and the two intermetallic TiNi_3, Ti_2Ni phases. This approach permitted to clearly identify the influence of secondary phases in porous NiTi materials and relation with Ni-ion release. The results indicated, apart the well-known high toxicity of Ni, also toxicity of TiNi_3, whilst phases with higher Ti content showed high biocompatibility. A slightly reduced biocompatibility of porous NiTi was ascribed to combined effect of TiNi_3 presence and topography that requires higher effort for the cells to adapt to the surface.
机译:基于NiTi的形状记忆合金已经在主要用于外科手术工具,支架和整形外科的新型生物医学设备制造中找到了主要应用。 NiTi多孔材料的工程弹性模量可与皮质骨(12-17 GPa)相媲美。这种状况,加上适当的孔径,可以实现良好的骨整合。通过自蔓延高温合成(SHS)从Ni和Ti混合粉末开始生产开孔多孔NiTi。在SHS期间会与其他Ni-Ti化合物一起形成主要的NiTi相。通过单培养实验和离子在小样本上的释放研究了这种材料的生物相容性。特别是,对NiTi和多孔NiTi以及元素Ti和Ni参比金属以及两个金属间TiNi_3,Ti_2Ni相进行了评估。这种方法可以清楚地识别出多孔NiTi材料中次生相的影响以及与Ni离子释放的关系。结果表明,除了众所周知的Ni的高毒性外,还有TiNi_3的毒性,而具有较高Ti含量的相显示出高的生物相容性。多孔NiTi的生物相容性略有降低归因于TiNi_3的存在和形貌的综合影响,这需要细胞做出更大的努力才能使其适应表面。

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  • 来源
    《Journal of materials science》 |2014年第10期|2277-2285|共9页
  • 作者单位

    Unit of Lecco, Institute for Energetics and Interphases, National Research Council of Italy - IENI-CNR, Corso Promessi Sposi 29, 23900 Lecco, Italy;

    Institute of Science and Technology for Ceramics, National Research Council of Italy - ISTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy;

    Institute of Science and Technology for Ceramics, National Research Council of Italy - ISTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy;

    Institute of Science and Technology for Ceramics, National Research Council of Italy - ISTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy;

    Institute of Science and Technology for Ceramics, National Research Council of Italy - ISTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy;

    Unit of Milano, Institute for Energetics and Interphases, National Research Council of Italy - IENI-CNR, Via R. Cozzi 53, 20125 Milano, Italy;

    Institute of Science and Technology for Ceramics, National Research Council of Italy - ISTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy;

    Unit of Lecco, Institute for Energetics and Interphases, National Research Council of Italy - IENI-CNR, Corso Promessi Sposi 29, 23900 Lecco, Italy;

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