摘要
本文比较了Cr_7C_3硬质涂层盘与钢球组成的滑动摩擦副在真空和大气中的干摩擦磨损特性,发现在真空中的平均滑动摩擦系数μ和钢球体积磨损率△W都比在大气中的低;对于动态滑动摩擦系数μ,存在一个临界滑动距离Sc,当滑动距离S小于这一距离时,μ_(真空)>μ_(大气),而当S超过这一距离时,则μ_(真空)<μ_(大气)。通过磨痕形貌扫描电子显微镜观测和微区X-射线能谱成分分析,发现由于真空中的粘着作用和摩擦热效应都明显增强,涂层中的Cr原子更容易向钢磨损表面转移并形成(Fe,Cr)碳化物膜,因而使μ和△W均下降。文章还讨论了转移膜的形成速率与载荷及滑动速度的关系,以及转移膜与摩擦振动的关系等。
A comparison of dry sliding friction in vacuum (6. 67 × 10-3Pa) and air has been made for steel ball against CVD Cr7C3 hard coating disc, which has been prepared using low-pressure CVD equipment of the Bernex Corporation. The results show that the mean sliding friction coefficients μ and the volume wear rate of steel ball △W in vacuum are lower than those in air; there is a critical sliding distance Sc for dynamic friction coefficient μ of this rubbing pair, if sliding distance S is longer than Sc, then μvacunm<μair. Scanning electron microscopy (SEM) observation and X-ray energy dispersive spectroscopy (EDS) analyses proved that the Cr atoms can transfer to the worn steel surface and form (Fe, Cr) carbide films more easily in vacuum due to the increasing of adhesion and thermal effect , then , both of μ and △W decrease. The relationships between formation rate of transfer films and PV value has been investigated, that is Sc linearly decreases with lg(PV) and the transfer film is closely related to the friction vibration.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
1993年第1期48-58,共11页
Tribology
