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Consistency-dependent optical properties of lubricating grease studied by terahertz spectroscopy
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
Affiliation: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;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;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;College of Science, China University of Petroleum, Beijing 102249, China;College of Science, China University of Petroleum, Beijing 102249, China;College of Science, China University of Petroleum, Beijing 102249, China;College of Science, 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
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.
Keywords:terahertz  lubricating grease  molybdenum disulfide  refractive index
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