SiC和Al2O3颗粒对Ti-25Nb-3Mo-3Zr-2Sn合金微磨损行为的影响

Effects of SiC and Al2O3 particles on micro-abrasion behavior of Ti-25Nb-3Mo-3Zr-2Sn alloy

摘要:

本文研究了SiC和Al₂O₃颗粒对生物医用植入材料Ti-25Nb-3Mo-3Zr-2Sn合金的微磨损行为的影响。在文中研究了合金的比磨损率、摩擦系数、磨损机制以及微磨损与腐蚀之间的协同作用。研究结果显示,合金的比磨损率随磨粒尺寸的增加而增加。由于SiC磨粒的硬度和切削性均优于Al₂O₃磨粒,由此在同尺寸磨粒下SiC磨粒所造成的材料的损失比Al₂O₃磨粒造成的要大。摩擦系数的结果显示,在同一种磨粒作用下,Hank’s溶液中所获得的摩擦系数的平均值大于蒸馏水中所获得的摩擦系数平均值,且由于Hank’s溶液的腐蚀性所致在Hank’s溶液中获得的摩擦系数的稳定性要比在蒸馏水中的稳定性差；在同尺寸磨粒下,Al₂O₃磨粒所造成的摩擦系数要大于SiC磨粒所造成的。随磨粒尺寸的减小,磨损机制由三体磨损转变为混合磨损之后再转变为二体磨损。从磨损机制图中可以看出腐蚀对材料损失的贡献是不容小视的,磨损机制为以磨损为主的磨损腐蚀。

Abstract:

The effects of SiC and Al₂O₃ abrasive particles on micro-abrasion behavior of a biomaterial Ti-25Nb-3Mo-3Zr-2Sn alloy in Hank’s solution was investigated. The effects of particle size and type were considered. The specific wear rate, friction coefficient, wear mechanism and the synergistic effect between the micro-abrasion and corrosion were studied. The results showed that the specific wear rates increased with an increase in the particle size. Due to the hardness and machinability of SiC particle is higher, the material loss caused by the SiC particle is greater than the Al₂O₃ particle under the same size. The average friction coefficients obtained in Hank’s solution are larger than those in distilled water for the SiC particle; however, the Al₂O₃ particle is just the opposite. For the same particle size, the average friction coefficients acquired by the Al₂O₃ particle is larger than the SiC particle. Due to the corrosivity of Hank’s solution, the stability of the friction coefficient in Hank’s solution is poor compared to that of distilled water. With a decrease of the particle size, the wear mechanism changed from a three-body rolling abrasion to a mixed mode and finally to a two-body grooving abrasion. The mechanistic map of the AC-PA against the PA illustrated that the contribution of corrosion to the total material loss cannot be ignored, and the main regime is abrasion-corrosion.