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Sn-Ag-Cu自润滑滚子轴承的高温摩擦学特性
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国家自然科学基金项目(51605230;51765044).


Temperature Tribological Characteristics of Sn-Ag-Cu SelfLubricating Roller Bearings
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    摘要:

    采用真空熔渗技术制备Sn-Ag-Cu高温自润滑滚子;在滚珠隔离式无保持架高温平面推力轴承试验装置上,对自润滑滚子轴承的高温摩擦特性进行试验研究;应用SEM/EDS技术分析轴承滚道摩擦表面的形貌和成分,研究试验温度、润滑剂合金与轴承滚动摩擦磨损之间的关系。研究表明:在400~600 ℃温度范围内,轴承的摩擦因数随着温度的的升高逐渐降低,当温度达到润滑剂合金熔点600 ℃时,摩擦因数达到最低值0.024;当温度为400 ℃时,轴承滚道摩擦表面以黏着磨损为主;随着温度升高,自润滑材料中的润滑剂合金逐渐析出涂覆在滚道表面,与滚道表面的高温氧化物共同影响轴承的摩擦学特性,因此在摩擦表面出现部分黏着磨损与氧化磨损;达到600 ℃后,滚道表面涂覆形成的润滑膜增多,因此氧化磨损和黏着磨损得到减轻,润滑效果最好。

    Abstract:

    The Sn-Ag-Cu high temperature selflubricating rollers were prepared by vacuum infiltration technology,and the high temperature tribological characteristics of selflubricating roller bearings were studied on a new type of high temperature plane thrust bearing which used a set of ball isolation bodies as a retainer.The morphology of the friction surface of the raceway and the wear scar composition were analyzed by SEM/EDS.The results show that the friction coefficient of bearing is decreased gradually with the increasing of temperature from 400 ℃ to 600 ℃,the friction coefficient reaches the lowest value of 0.024 when the temperature reaches lubricant alloy melting point of 600 ℃.When the temperature is 400 ℃,the main wear mechanism of bearing raceway friction surface is adhesion wear.As the temperature increases,the lubricant alloy in the selflubricating material gradually precipitates and coats on the raceway surface,which affects the tribological characteristics of the bearing together with the high temperature oxides on the raceway surface,therefore,some adhesive wear and oxidation wear occur on the friction surface.When the temperature is 600 ℃,the lubrication film formed on the surface of raceway is increased,therefore the oxidation wear and adhesion wear are alleviated,and the best lubrication effect is realized.

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张一兵,柯瀛,燕松山,刘佐民. Sn-Ag-Cu自润滑滚子轴承的高温摩擦学特性[J].润滑与密封,2019,44(12):7-11.
. Temperature Tribological Characteristics of Sn-Ag-Cu SelfLubricating Roller Bearings[J]. Lubrication Engineering,2019,44(12):7-11.

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  • 在线发布日期: 2020-03-19
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