凝胶注模成形多孔Ti-7.5Mo合金的孔隙及力学性能
Porosity and mechanical properties of porous Ti-7.5Mo alloy for medical applications by gelcasting
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摘要: 以振动球磨方式混合Ti-Mo粉体,采用凝胶注模成形制备了多孔Ti-7.5Mo合金制品,并利用扫描电子显微镜、X射线衍射和力学性能试验分别对其显微结构和力学性能进行了测试和分析,研究了预混液单体质量分数和浆料固相含量对其孔隙性能和力学性能的影响.结果表明,与纯Ti粉末相比,添加质量分数为7.5%的Mo混合粉末浆料的流变特性较好,所得合金由分布均匀的α-Ti基体和β-Ti组成,其孔隙率为39.15%~45.97%,孔径为5~98μm.与凝胶注模多孔纯钛相比,多孔Ti-7.5Mo合金的生物力学性能更加优异,适合作为医用植入材料.Abstract: A porous titanium based alloy containing 7.5% molybdenum was prepared by gelcasting. The microstructure, total porosity and mechanical properties of the sintered porous Ti-7.5Mo alloy were investigated by using electron microscopy, X-ray diffraction, compression and bending tests. The effect of gelcasting parameters on the porosity and mechanical properties of the porous Ti-7.5Mo alloy were studied. It is shown that the rheological behavior of the mixture metal slurry by adding 7.5% Mo powders improves in comparison with pure Ti powders. The open and closed three-dimensional pore morpbologies and the total porosity around 39. 15% to 45.97% can be achieved. The average pore size around 5 to 98 μm and equiaxed cL crystal grains + β phases were observed in the sintered alloy. In contrast to porous Ti by gelcasting available before, the porous Ti-7.5Mo alloy presents excellent properties, therefore being suited for medical applications.