Wang Ze, He Zhiqiang, Duan Bohua, Liu Xinli, Wang Dezhi
School of Materials Science and Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2022 Nov 25;15(23):8398. doi: 10.3390/ma15238398.
Porous NiTi alloys are widely applied in the field of medical implant materials due to their excellent properties. In this paper, porous NiTi alloys were prepared by non-aqueous gel-casting. The influence of solid loading on the process characteristics of slurries and the microstructure and mechanical properties of sintered samples were investigated. The viscosity and the stability of slurry significantly increased with the growth of solid loading, and the slurry had better process characteristics in the solid loading range of 40-52 vol.%. Meanwhile, the porosity and average pore diameter of the sintered NiTi alloys decreased with a rise in the solid loading, while the compressive strength increased. Porous NiTi alloys with porosities of 43.3-48.6%, average pore sizes of 53-145 µm, and compressive strengths of 87-167 MPa were fabricated by gel-casting. These properties meet the requirements of cortical bone. The results suggest that the pore structure and mechanical properties of porous NiTi products produced by gel-casting can be adjusted by controlling the solid loading.
多孔镍钛合金因其优异的性能而被广泛应用于医用植入材料领域。本文采用非水凝胶注模法制备了多孔镍钛合金。研究了固相含量对浆料工艺特性以及烧结样品微观结构和力学性能的影响。随着固相含量的增加，浆料的粘度和稳定性显著提高，在40-52 vol.% 的固相含量范围内，浆料具有较好的工艺特性。同时，烧结镍钛合金的孔隙率和平均孔径随固相含量的增加而减小，抗压强度则增加。通过凝胶注模法制备出了孔隙率为43.3-48.6%、平均孔径为53-145 µm、抗压强度为87-167 MPa的多孔镍钛合金。这些性能满足皮质骨的要求。结果表明，通过控制固相含量可以调节凝胶注模法制备的多孔镍钛产品的孔隙结构和力学性能。
