Investigation of the Tribological Properties of Two Different Layered Sodium Silicates Utilized as Solid Lubrication Additives in Lithium Grease

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• 作者：Xiaosheng Zhang ; Weichao Sun ; Huijuan Ma ; Hong Xu ; Jinxiang Dong
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：January 8, 2014
• 年：2014
• 卷：53
• 期：1
• 页码：182-188
• 全文大小：398K
• ISSN：1520-5045

文摘

Layered sodium silicates 尾-Na₂Si₂O₅ and kanemite were synthesized via facile methods under mild conditions. The tribological properties of 尾-Na₂Si₂O₅ and kanemite utilized as additives in lithium grease were evaluated with a four-ball tester under different experimental conditions. The maximum nonseizure load value of 5.0 wt鈥? 尾-Na₂Si₂O₅ grease jumped from 353 N (the base grease) to 1568 N. However, 5.0 wt鈥? MoS₂ grease could only reach 617 N under the same conditions. The SEM and EDS results confirm that a protective film mainly composed of sodium silicates was formed on the worn surface during the friction process. The structural stability of 尾-Na₂Si₂O₅ and kanemite after the wear test was studied by XRD. It was found that a loss of interlamellar water causes the layer structure of kanemite to collapse during a long-duration wear test. The layered structure of 尾-Na₂Si₂O₅ is stable, and its tribological properties are better than those of kanemite.