摘要
基于摩擦界面微结构与界面温度的关系,建立界面摩擦过程中界面原子热振动的温升模型,探讨界面温度对摩擦学过程的激活机制。结果表明:考虑原子质量单因素时,原子质量的变化抑制摩擦界面温升,且界面温度愈高抑制作用愈显著;综合考虑原子质量及原子固有频率影响因素时,在相对滑动速度较小且界面温度较低的情况下,原子质量的变化对摩擦学激活作用很小,而在相对滑动速度较高且界面温度较高时,原子质量对摩擦界面温升具有较为明显的正向激活作用;晶格常数随温度变化的特性对摩擦学过程具有反向抑制作用,且摩擦界面晶体热膨胀系数越大,其抑制作用愈强。
A temperature rising model of the atomic vibration was established by the view of the relationship between the micro struc- ture and the temperature in contact surface, the activation mechanism of temperature to interfacial friction process was studied. The results indicate that, considering single factor of atomic mass, the changing of atomic mass suppresses friction interface temperature rising, and the higher of interface temperature the more significant of inhibitory effect. Considering the impact of atomic mass and atomic natural frequen- cy, when the relative sliding velocity is small and the interface temperature is lower, the changing of atomic mass on the tribological activa- tion is very small, but when the relative sliding speed is higher and the interface temperature is high, the changing of atomic mass has the positive activation obviously. Characteristic of crystal constant with temperature change has the inhibition effect on tribological process, and the bigger the thermal expansion coefficient of crystal, the more obvious inhibition is.
出处
《润滑与密封》
CAS
CSCD
北大核心
2014年第4期7-10,共4页
Lubrication Engineering
基金
湖南省自然科学基金项目(11JJ3060)
湖南省科技计划项目(2012GK3144)
中南林业科技大学引进高层次人才科研启动基金项目(104-0151)
关键词
界面摩擦
激活机制
摩擦热
interfacial friction
activation mechanism
frictional heat
