工业纯钛TA1的高温摩擦与磨损行为

工业纯钛(TA1)表面塑性剪切抗力较低且氧化膜保护作用有限,在滑动摩擦时会产生严重的磨损行为。经高温氧化处理的TA1圆盘试样通过高温摩擦磨损试验机以及扫描电镜(SEM)和能谱(EDS)分析,研究实验温度、氧化膜及富氧α层对TA1摩擦磨损行为的影响规律。结果表明,由于磨屑的润滑作用,在相同的载荷和磨损时间下,有氧化层TA1的摩擦因数范围在0.07~0.3,无氧化层TA1摩擦因数范围在0.55~0.9之间。摩擦磨损实验温度越高,有氧化层的TA1摩擦处的犁沟形貌分布越多、越深。对于无氧化层TA1试样,随温度升高和对磨时间的延长,裂纹更易扩展形成剥层磨损。TA1材料的主要磨损方式为剥层磨损、黏着磨损以及氧化磨损,无氧化膜及富氧α层的TA1材料黏着磨损更为严重。表面硬度和磨损机制不同造成高温下摩擦磨损性能的差异。

Friction and wear behavior of commercially pure titanium TA1 at high temperature

The plastic shear resistance of commercially pure titanium(TA1)surface is low and the protective effect of oxide film is limited.Serious wear behavior will occur during sliding friction.The friction and wear behavior of TA1 disc treated by high temperature oxidation was studied by means of high temperature friction and wear tester,scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show,because of the lubrication effect of abrasive debris,under the same load and wear time,the friction coefficient of TA1 with oxide layer ranges from 0.07 to 0.3,and that of TA1 without oxide layer ranges from 0.55 to 0.9.The higher the friction and wear test temperature is,the more and deeper the furrow morphology distribution is at the friction area of TA1 with oxidation layer.For TA1 specimens without oxide layer,with the increase of temperature and the prolongation of grinding time,cracks are easier to propagate and form delamination wear.The main wear modes of TA1 material are delamination wear,adhesion wear and oxidation wear.The adhesion wear of TA1 material without oxide film and oxygen-rich layer is more serious.Different surface hardnesses and wear mechanisms result in different friction and wear properties at high temperature.