True Stability of Lubricants Determined Using the Ball-on-Disk Test

IF 1.5 Q3 ENGINEERING, MECHANICAL Advances in Tribology Pub Date : 2016-02-01 DOI:10.1155/2016/4020537
A. Tortora, D. Veeregowda
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引用次数: 6

Abstract

True stability of lubricants can be determined when there is minimum change in the contact area and also the intervention of wear debris in the contact zone. Here, we have used the ball-on-disk instrument with the migrating point contact, that is, relative motion between the ball and disk condition to fix the contact area and minimize the wear debris at the contact zone. The jump in the friction coefficient indicates the film failure, which appeared earlier for the motor oil 5W30 compared to 5W40. Such profile was not recorded in absence of relative motion. Therefore, 5W40 was considered to have a better lubricant stability than 5W30. Applying the same test condition to the natural lubricants shows that glycerol has better lubricant stability than glycerol-water mixture. Superior true lubricant stability by glycerol and 5W40 can be related to its high viscosity. However, they were less wear resistant compared to low viscosity lubricants like 5W30 and glycerol-water. We suspect the role of microscopic wear debris at the contact zone for this behavior although it should have been avoided in the migrating point contact condition. Overall, ball-on-disk instrument with a migrating point contact condition is an effective technique to determine the stability of lubricants.
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使用球盘试验确定润滑剂的真正稳定性
润滑油的真正稳定性可以在接触区域的变化最小的情况下确定,也可以在接触区域的磨损碎片的干预下确定。在这里,我们使用带有迁移点接触的球盘仪器,即球盘之间的相对运动状态来固定接触区域,并最大限度地减少接触区域的磨损碎片。摩擦系数的跳跃表明油膜失效,与5W40相比,5W30机油出现的时间更早。在没有相对运动的情况下,没有记录这样的剖面。因此,5W40被认为比5W30具有更好的润滑剂稳定性。用相同的试验条件对天然润滑剂进行试验,结果表明,甘油比甘油-水混合物具有更好的润滑剂稳定性。甘油和5W40所具有的优异的真正润滑剂稳定性与其高粘度有关。然而,与5W30和甘油水等低粘度润滑剂相比,它们的耐磨性较差。我们怀疑接触区微观磨损碎屑的作用,尽管在迁移点接触条件下应该避免这种行为。综上所述,具有迁移点接触条件的球盘仪是一种测定润滑剂稳定性的有效技术。
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来源期刊
Advances in Tribology
Advances in Tribology ENGINEERING, MECHANICAL-
CiteScore
5.00
自引率
0.00%
发文量
1
审稿时长
13 weeks
期刊最新文献
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