稀土CeO_2增强型多孔钛的制备与性能

Preparation and Mechanical Properties of Porous Titanium Enhanced by CeO_2

孔隙率对多孔钛的成骨性能影响较大,高的孔隙率更有利于骨组织的长入。但随着孔隙率的升高,其力学性能必然会急剧下降。因此,如何在保证多孔钛高孔隙率的前提下提高其力学性能,成为当前势必解决的难题。本研究采用浆料发泡法,通过在钛粉中加入不同含量的氧化铈,制备出高孔隙率的多孔钛。结果表明,多孔钛孔隙呈三维网络状,孔隙率为71.6%～73.5%,孔径主要分布在100～700μm,且孔壁上分布着微米级的微孔。当氧化铈的加入量为0.2%(质量分数,下同)时,多孔钛表现出最优的生物力学相容性,其杨氏模量为2.08GPa,抗压强度为60.19MPa。

Porosity is important to osteogenesis for porous titanium implants.Higher porosity is good for enhancement of osteogenesis.But the mechanical properties of porous titanium must rapidly decrease when its porosity increases.The puzzle now is to find a porous titanium implant with high mechanical properties as well as high porosity.The novel porous titanium which fit for bone ingrowth was fabricated by traditional slurry foaming,with CeO2 as additive.Microstructure and mechanical properties were studied by scanning electronic microscope（SEM） and compression tests respectively.The results show that the pores mainly in 100-700 μm of porous titanium with the porosity of 71.6%-73.5% are all interconnected and there are many microspores（about 10 μm） on the wall of macrospores.The porous titanium enhanced by 0.2wt%CeO2 presents optimal biomechanical compatibility,whose Young＇s modulus and compressive strength are 2.08 GPa and 60.19 MPa,respectively,similar to that of cortical bone.