纳米结构钛的生物力学性能研究

目的为改善植入材料生物力学相容性,探讨表面机械研磨处理(Surface mechanical Attrition Treatment,SMAT)对纯钛的力学性能影响。方法将厚度为1mm的纯钛板进行两面SMAT处理,之后进行力学性能测试,分析SMAT对纯钛力学性能的影响。结果SMAT处理后纯钛板表面形成了纳米晶,而整体成为了梯度材料。结果表明SMAT能使纯钛的强度提高、塑性下降、表面显微硬度大大提高。最重要的是,这种方法使钛的弹性模量显著降低,从而改善了钛的生物力学相容性。结论SMAT处理能使纯钛表面纳米化,并且使其弹性模量降低,能够改善它的生物力学相容性,在医用领域有良好前景。

Study on biomechanical properties of nanostructured titanium

Objective In order to improve biomechanics compatibilities of implant materials,the effect of SMAT process on mechanical properties of pure Ti has been studied.Methods Mechanical tests have been carried out to analyze the SMAT effect on mechanical properties of pure Ti after the 1mm thick Ti sheet was subjected to SMAT process.Results After SMAT process,the surface of pure Ti has been nanolized and the body has been converted into a gradient material. The study results show that SMAT process has made the Ti's strength increase,its plasticity decrease while the microhardness in its surface layer increase greatly.The most important is that the Ti's elastic modulus has decreased significantly which can improve Ti's biomechanics compatibility.Conclusion SMAT process is able to nanolize Ti's surface,which can decrease Ti's elastic modulus and improve Ti's biomechanics compatibility to make it promising in biomedical application.