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选用等原子比NiTi预合金粉末作为原料,以聚氨酯泡沫为模板,采用浸渍法制备了一种具有高孔隙率、孔径可控、孔隙三维连通且生物力学相容性优良的多孔镍钛合金材料。通过X射线衍射仪、体视显微镜、扫描电子显微镜及力学试验机,研究分析了两种不同型号有机模板(R2D25和DP91308)制备的多孔镍钛合金的物相组成、微观结构和力学性能。结果表明:有机模板浸渍法可以制备出高孔隙率且具有三维连通孔隙结构的多孔镍钛合金。两种模板对应的孔隙率分别为71.8%和63.8%,孔径分布在250~500μm和150~400μm之间,抗压强度分别为16.37和73.52MPa,弹性模量为0.51和2.45GPa,与人体骨组织的结构与性能相匹配。
The preparation of porous nickel-titanium alloy with high porosity, controlled pore diameter, three-dimensional interconnection and excellent biomechanical compatibility was made by using NiTi pre-alloyed powder of equal atomic ratio as raw material and polyurethane foam as a template. The phase composition, microstructure and mechanical properties of porous nickel-titanium alloy prepared by two different types of organic templates (R2D25 and DP91308) were studied by X-ray diffraction, stereo microscope, scanning electron microscope and mechanical testing machine. The results show that porous nickel-titanium alloy with high porosity and three-dimensional interconnected pore structure can be prepared by organic template impregnation method. The porosity of the two templates is 71.8% and 63.8%, respectively. The pore size distribution is between 250 and 500 μm and 150 to 400 μm, the compressive strengths are 16.37 and 73.52 MPa, the elastic moduli are 0.51 and 2.45 GPa respectively, The structure and performance of the organization match.