首页> 外文期刊>Materials Science and Engineering >Composites matching the properties of human cortical bones: The design of porous titanium-zirconia (Ti-ZrO_2) nanocomposites using polymethyl methacrylate powders
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Composites matching the properties of human cortical bones: The design of porous titanium-zirconia (Ti-ZrO_2) nanocomposites using polymethyl methacrylate powders

机译:匹配人类皮质骨特性的复合材料:使用聚甲基丙烯酸甲酯粉末设计多孔钛-氧化锆(Ti-ZrO_2)纳米复合材料

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摘要

Bone-like low elastic modulus micro-porous titanium (Ti) and titanium-zirconia (Ti-ZrO_2) nanocomposites were fabricated by a pressureless sintering process with biocompatible polymethyl methacrylate (PMMA) powders as the pore-forming agents. A microstructural analysis revealed that the method can successfully make randomly distributed pores in the sintered monolithic and nanocomposite, and the pore-forming agents can be removed by a heat treatment process. The material properties, i.e., the relative density, pore morphology, microhardness and elastic modulus, can be dramatically altered with the pore-forming agent Moreover, the porous Ti-based nanocomposites produced in this way (50 vol% PMMA) have interconnected pores, higher biocompatibility, better mechanical properties and well controlled the Ti grain size, when compared with the monolithic porous Ti bodies through the second phase strengthening mechanism. The elastic moduli of the highly porous monolithic Ti and Ti-ZrO_2 nanocomposites can be controlled to be about 20.0 and 22.4 GPa, respectively, which are almost the same as human cortical bones (7-25 GPa).
机译:以生物相容性聚甲基丙烯酸甲酯(PMMA)粉末为造孔剂,通过无压烧结工艺制备了骨状低弹性模量的钛微孔和钛氧化锆(Ti-ZrO_2)纳米复合材料。微观结构分析表明,该方法可以在烧结的整体和纳米复合材料中成功地形成随机分布的孔,并且可以通过热处理工艺除去成孔剂。材料的性能,例如相对密度,孔形貌,显微硬度和弹性模量,可以通过成孔剂显着改变。此外,以这种方式生产的多孔Ti基纳米复合材料(50%(体积)PMMA)具有相互连接的孔,与通过第二相强化机理的整体多孔Ti体相比,具有更高的生物相容性,更好的机械性能并很好地控制了Ti晶粒尺寸。可以将高度多孔的整体式Ti和Ti-ZrO_2纳米复合材料的弹性模量分别控制为约20.0 GPa和22.4 GPa,几乎与人的皮质骨(7-25 GPa)相同。

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