修复剂羟基硅酸镁存在时钢摩擦副的摩擦磨损特性研究

Study on Tribological Behavior of Mg_6Si_4O_(10)(OH)_8 Additive Package with Steel Tribo-Pair

在实验室条件下,验证了主要组分为Mg6Si4O10(OH)8的金属磨损自修复剂在45#钢摩擦副表面形成修复保护层的能力,得到了厚3～6 μm的反应层;采用Falex型摩擦磨损试验机进行了长达400 h的摩擦磨损试验,研究了在Mg6Si4O10(OH)8润滑下45#钢摩擦副的摩擦磨损性能、摩擦副摩擦表面显微硬度和温度随时间变化的情况.结果表明:Mg6Si4O10(OH)8在润滑过程中具有准周期性衰减振荡函数的特点,200 h左右为1个准周期;反应层的显微硬度较45#钢基体提高1倍;修复层的C和O含量较高.

Tribological behaviors of 45^# steel-steel pair under presence of Mg6Si4O10（OH）s as an additive dispersed in API SD/CC/SAE40 engine oil were investigated. Tribological experiments were carried out on a Falex friction and wear tester in ring-on-ring contact configuration for about 400 h including 11 experimental stages. Wear and micro-hardness of the worn surface were measured after every experimental stage,cross section of the worn surface was observed and analyzed with SEM and EDX after the whole tribological test.According to the variations in friction coefficient, wear rate, temperature of tribo-pair and tribo-surface micro hardness with time, the tribological process lubricated by oil containing Mg6Si4Ox0（OH）s shows quasiperiodicity with characteristic of damped oscillation, and quasi-period is 200 h；micro-hardness of the worn surface is one time higher than that of 45^#steel substrate. SEM and EDX results showed that a 3-6μmthickness recovered layer with high C and O content could be generated on the 45^# steel tribo-surface.