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Lubricating Property of Water Based Lubricant of Konjac Glucomannan |
Xuelian QI, Qianqian ZHANG, Dezun SHENG, Xiaolei LI, Huichen ZHANG( ) |
Transportation Equipments and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China |
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Cite this article:
Xuelian QI, Qianqian ZHANG, Dezun SHENG, Xiaolei LI, Huichen ZHANG. Lubricating Property of Water Based Lubricant of Konjac Glucomannan. Chinese Journal of Materials Research, 2018, 32(1): 25-32.
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Abstract The lubricating property of water-based lubricant of konjac glucomannan (KGM) was assessed for the contact surface of quartz to quartz. The molecular structure of konjac glucomannan was analyzed by Fourier transform infrared spectroscopy. The surface topographies of the worn quartz surface after sliding-wear were examined by LEXT OLS4000 3D microscope. The friction performance of the friction-pair of quartz against quartz was evaluated by the CETR Universal Micro-Tribometer (UMT-2). The lubricating property of KGM solutions was then analyzed. The results show that the 0.3% KGM solution possesses the best lubricity, in the presence of which the friction-pair of quartz exhibits a friction coefficient about 0.002. The frictional coefficient of the friction-pair of quartz varied with the KGM concentration of the solution, as well as the relatively rotating speed of the components of the friction-pair. By adding saturated boric acid to the solution, the hydration layer of KGM was promoted due to the coordination compound which was generated by the chemical reaction between the boric acid and the KGM molecules. The lubricating model of KGM solution was composed of hydrationlayers of KGM and water layers, in which the former absorbed on the frictional pairs to form a lubricating film, while the water layer ensures the shear liquidity of lubricant, only the combination of the two can realize the effective lubrication.
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Received: 20 December 2016
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Fund: Supported by National Natural Science Foundation of China (No. 51335005) and Fundamental Research Funds for the Central Universities (No. 3132016354) |
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