Consistency-dependent optical properties of lubricating grease studied by terahertz spectroscopy |
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Authors: | Tian Lu Zhou Qing-Li Zhao Kun Shi Yu-Lei Zhao Dong-Mei Zhao Song-Qing Zhao Hui Bao Ri-M Zhu Shou-Ming Miao Qing and Zhang Cun-Lin |
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Institution: | State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China; College of Science, China University of Petroleum, Beijing 102249, China; Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University, Beijing 100048, China |
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Abstract: | The optical properties of four kinds of lubricating greases (urea, lithium, extreme pressure lithium, molybdenum disulfide lithium greases) with different NLGL (National Lubricant Grease Institute of America) numbers were investigated using terahertz time-domain spectroscopy. Greases with different NLGL grades have unique spectral features in the terahertz range. Comparison of the experimental data with predictions based on Lorentz--Lorenz theory exhibited that the refractive indices of each kind of lubricating grease were dependent on the their consistency. In addition, molybdenum disulfide (MoS2) as a libricant additive shows strong absorption from 0.2 to 1.4 THz, leading to higher absorption of MoS2-lithium grease than that of lithium grease. |
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Keywords: | terahertz lubricating grease molybdenum disulfide refractive index |
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