摘要
目的研究医用NiTi合金在Hank’s模拟人体生理溶液中的微磨损行为。方法采用TE66微磨粒磨损试验机对医用NiTi合金进行微磨损测试,计算合金磨损率,采用SEM观察合金磨损后的表面形貌来分析磨损机制。在测试过程中考虑加载载荷、磨损颗粒浓度、磨损颗粒类型及尺寸对合金微磨损行为的影响。结果 NiTi合金的磨损率随载荷的增加而降低。当载荷小于1.0 N时,合金的磨损率受磨损颗粒浓度的影响不大;当载荷大于1.0 N时,合金的磨损率随磨损颗粒浓度的增加而增加。在同一尺寸下,由于Si C颗粒具有较高的硬度和较大的切削力,所导致的NiTi合金的磨损率比Al_2O_3颗粒造成的磨损率要大。当磨损颗粒为Si C时,NiTi合金的磨损率随磨损颗粒尺寸的变化无明显规律性。在所涉实验条件下,当磨损颗粒为Si C F1200,摩擦配偶为ZrO_2,加载载荷为2.0 N,磨损颗粒质量浓度为0.05 g/cm^3时,所获得NiTi合金的磨损率最低,为2.3×10^(-5)mm^3/(N·m)。结论在同一磨损颗粒浓度下,合金的磨损率随加载载荷的增加而降低。在较低载荷时,磨损颗粒的浓度对合金的磨损率影响不大;在较高载荷下,随磨损颗粒浓度的增加,合金的磨损率增加。磨损机制以磨粒磨损为主。
The work aims to study the micro-wear behavior of the NiTi alloy in Hank’s simulated body fluid.The micro-wear test was carried out on medical NiTi alloy by the TE66 micro-scale abrasion tester to calculate the wear rate and scanning electron microscopy was adopted to observe the alloy surface to analyze the wear mechanism.The effects of load,particle concentration,type and size of wear particles were considered during test.The wear rates decreased with increasing of the applied load.When the load was lower than 1.0 N,the effect of particle concentration was insignificant.When the load was higher than 1.0 N,the wear rate increased with increasing of the particle concentration.Under the same size,SiC particles had higher hardness and cutting force,so the wear rate of NiTi alloy was higher than that of Al2O3 particles.When the particles were SiC,the wear rate of NiTi alloy did not change obviously with the size of wear particle.In the experimental conditions,when the particles were SiC F1200,friction pair was ZrO2 and particle concentration was 0.05 g/cm3,the minimum wear rate of 2.3×10^-5 mm^3/(N·m)was obtained.In the same concentration of wear particle,the wear rate of alloy decreases as the load increases.Under lower load,the concentration of wear particle has no significant effects on wear rate of alloy.Under higher load,the wear rate of alloy increases as the concentration of wear particle rises.The wear mechanism in this experiment is mainly the abrasive wear.
作者
薛燕
王振国
XUE Yan;WANG Zhen-guo(Chongqing Vocational Institute of Engineering,Chongqing 402260,China;Beihang University,Beijing 100191,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2018年第11期97-101,共5页
Surface Technology
基金
国家自然科学基金(51401027)
中国博士后科学基金资助项目(2016M591040)~~
关键词
NITI合金
模拟体液
微磨损
摩擦副
磨损颗粒
NiTi alloy
simulated body fluid
micro-wear
friction pair
wear particles
作者简介
薛燕(1980—),女,硕士,主要研究方向为轻合金成形工艺及表面改性;通讯作者:王振国(1983—),男,博士,主要研究方向为生物医用钛合金及金属材料的腐蚀-磨损行为。邮箱:wangguo8356@163.com。
