摘要
为研究高压、微间隙、非稳态条件下的摩擦学问题,自行研制了高压微间隙摩擦测试仪。它可以通过计算机对电机的转速、起停状态的控制,模拟重载条件下点接触摩擦副的运动状态。选用蓝宝石和高精度GCr15球作为实验摩擦副,设计了自动加载机构,实现最大工作压力达3 GPa。应用相对光强光干涉原理,测量润滑膜厚度,垂直方向上膜厚分辨率达到0.5 nm,水平方向的分辨率可达1.0μm。采用间接测量法,利用高精度扭矩仪,对球与盘间的摩擦力进行实时测量,测量精度为0.1 N。在温控系统中采用闭环控制方式,实现了准确控温,控温精度为±1℃。以5种润滑剂进行实际测量,研究了各类润滑液膜厚随速度的变化规律,验证了仪器的稳定性。
A high-pressure micro-clearance tribological measuring apparatus was developed and used to study the tribological problems under the high-pressure, micro-clearance or non-steady conditions. To control the starting and stopping state of motor by computer, the apparatus can simulate the moving state of the point contact. With sapphire and high-precision ball （GCr15） as friction pairs in experiment, by using a lever as the automatically loading device, the apparatus attains the maximum working pressure of 3 GPa. The film thickness is measured by the technique of Relative Optical Intensity with the resolution of 0. 5 nm in the vertical direction and 1.0μm in the horizontal direction. Using the indirect measurement method, the friction between the disk and the ball is measured with the resolution of 0. 1 N. In the temperature control system, the temperature is controlled very accurately through the closed-loop control mode, and the resolution is ＋ 1 ℃. Five kinds of lubricants were measured with the measuring apparatus. The variant trends of film thickness with sliding velocity were studied ,which certificates that the measuring equipment is stable.
出处
《润滑与密封》
CAS
CSCD
北大核心
2007年第11期165-169,共5页
Lubrication Engineering
基金
国家973项目(2006CB705403
2007CB607604)
关键词
纳米膜
摩擦力
测试
nanometer film
friction
measuring
