THE MEASUREMENT AND STUDY OF VERY THIN LUBRICANT FILMS IN CONCENTRATED CONTACTS
THE MEASUREMENT AND STUDY OF VERY THIN LUBRICANT FILMS IN CONCENTRATED CONTACTS
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DOI：
10.1080/10402009108982026
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发表时间：
1991-04-01
影响因子：
2.1
通讯作者：
SPIKES, HA
中科院分区：
文献类型：
--
作者：
JOHNSTON, GJ;WAYTE, R;SPIKES, HA
光学干涉法是目前测量模型滚动和滑动弹流接触中分离膜厚度的一种广泛使用的技术。传统使用的方法有两个局限性：第一，它不能容易地用于精确测量小于可见光波长的四分之一的薄膜，即小于约100 nm。其次，只能确定间隔至少50 nm的特定的、离散的厚度。本文描述了为克服这些限制所做的工作，以便使光学干涉法适用于滚动接触的边界或超薄膜弹流润滑的研究。固体间隔层与接触反射光的光谱分析相结合，可以精确测量非常薄的润滑膜。该方法被应用于研究低粘度润滑剂在滚动接触中形成的薄膜。当薄膜厚度小于15 nm时，薄膜厚度与速度的关系出现反常现象。
Optical interferometry is now a widely used technique for measuring the separating film thickness in model rolling and sliding elastohydrodynamic contacts. There are two limitations of the method as conventionally employed: first, it cannot easily be used to accurately measure films less than one quarter the wavelength of visible light, i.e. less than about 100 nm. Secondly, only certain, discrete thickness, spaced at least 50 nm apart can be determined. This paper describes work aimed at overcoming these limitations so as to make optical interferometry applicable to the study of boundary or very thin film elastohydrodynamic lubrication in rolling contacts. A combination of a solid spacer layer with spectrometric analysis of reflected light from the contact enables very thin lubricant films to be accurately measured. The approach is applied to the study of thin films formed in rolling contacts by low viscosity lubricants. Some anomalies in the relationship between film thickness and speed are found with films of less than 15 nm thickness.