Guerra Carolina, Walczak Magdalena, Sancy Mamié, Martínez Carola, Aguilar Claudio, Kalbarczyk Marek
Departamento de Ingeniería Mecánica y Metalúrgica, Pontificia Universidad Católica de Chile (PUC), Santiago 7820436, Chile.
Centro de Investigación en Nanotecnología y Materiales Avanzados, CIEN-UC, PUC, Santiago 7820436, Chile.
Materials (Basel). 2020 Jul 23;13(15):3284. doi: 10.3390/ma13153284.
The tribological properties of a novel porous Ti-Nb-Ta-Fe-Mn alloy with 0%, 30%, and 60% porosity were evaluated for biomedical applications. The tribotesting was performed using a ball-on-disc under dry conditions, using an alumina ball and 1 N of a load. The coefficient of friction at the early stage of the porous samples was lower than that of the bulk, 0.2 and 0.7, respectively, but the samples with 30% porosity shift toward the bulk value after a variable number of cycles, while the samples with 60% remained stable after 100,000 cycles. The wear rate of the specimen with 60% porosity was twice as low as that of the bulk. The results are explained by shift in wear mechanism associated with the modified bearing ratio of the porous surface and by the accumulation of wear debris inside the pores, which prevented the development of three-body abrasion.
对孔隙率分别为0%、30%和60%的新型多孔Ti-Nb-Ta-Fe-Mn合金的摩擦学性能进行了生物医学应用评估。摩擦测试是在干燥条件下使用销盘式摩擦磨损试验机进行的，使用氧化铝球和1 N的载荷。多孔样品在早期阶段的摩擦系数低于块状样品，分别为0.2和0.7，但孔隙率为30%的样品在经过不同数量的循环后向块状样品的值转变，而孔隙率为60%的样品在100,000次循环后保持稳定。孔隙率为60%的试样的磨损率比块状试样低两倍。这些结果可以通过与多孔表面修正的承载比相关的磨损机制的转变以及孔隙内磨损碎屑的积累来解释，这阻止了三体磨损的发展。
