Porosity and mechanical properties of porous Ti-7.5Mo alloy for medical applications by gelcasting
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摘要: 以振動球磨方式混合Ti-Mo粉體,采用凝膠注模成形制備了多孔Ti-7.5Mo合金制品,并利用掃描電子顯微鏡、X射線衍射和力學性能試驗分別對其顯微結構和力學性能進行了測試和分析,研究了預混液單體質量分數和漿料固相含量對其孔隙性能和力學性能的影響.結果表明,與純Ti粉末相比,添加質量分數為7.5%的Mo混合粉末漿料的流變特性較好,所得合金由分布均勻的α-Ti基體和β-Ti組成,其孔隙率為39.15%~45.97%,孔徑為5~98μm.與凝膠注模多孔純鈦相比,多孔Ti-7.5Mo合金的生物力學性能更加優異,適合作為醫用植入材料.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.
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Key words:
- titanium alloys /
- porous materials /
- gelcasting /
- porosity /
- mechanical properties
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