中文摘要：

采用粉末冶金法制备外层高孔隙率/内层低孔隙率的梯度结构多孔钛,以解决单层多孔钛孔隙率高强度低的问题。梯度双层多孔钛内层孔隙率约为30%,外层孔隙率可达65%以上,孔径范围在100~255μm之间,内/外层孔径和孔隙率呈梯度分布,其抗压强度和弹性模量分别为117.50~143.55MPa和1.95~3.08GPa。在梯度多孔钛外层添加稀土氟化镧进一步提高了其力学性能。当添加量为0.05%（质量分数）时,其抗压强度和弹性模量最高,可达到213.76MPa和3.38GPa。

英文摘要：

The novel gradient porous titanium, with the outer high porosity and inner low porosity, was prepared by a powder metallurgy method in order to solve the problem of high porosity and low strength of singer-layer porous titanium （SPT）. The compressive strength （CS） and Young’s modulus （YM） of the gradient double-layer porous titanium （DPT） are 117.50~143.55 MPa and 1.95~3.08 GPa, respectively, when its inner porosity is about 30%, outer porosity more than 65% and the pore size range 100~255 μm. The inner/outer pore size and porosity are of gradient distribution. The mechanical properties of the DPT are further improved through adding rare earth lanthanum fluoride （LaF3） to the outer layer. The CS and YM of the DPT with 0.05wt% LaF3 in outer layer are up to 213.76 MPa and 3.38 GPa, respectively.