Tribological Properties of Alkylphenyl Diphosphates as High-Performance Antiwear Additive in Lithium Complex Grease and Polyurea Grease for Steel/Steel Contacts at Elevated Temperature

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• 作者：Xinhu Wu ; Qin Zhao ; Gaiqing Zhao ; Junming Liu ; Xiaobo Wang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 9, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：5660-5667
• 全文大小：698K
• 年卷期：v.53,no.14(April 9, 2014)
• ISSN：1520-5045

文摘

The alkylphenyl diphosphates pentaerythritol tetrakis(diphenyl phosphate) (PDP) and trimethylolpropane tris(diphenyl phosphate) (TDP) were evaluated as the antiwear additives in lithium complex grease and polyurea grease at 200 掳C. The results indicated that both additives may effectively reduce the sliding friction and wear as compared to the base greases. The tribological performances were generally better than the normally used molybdenum disulfide (MoS₂)-based additive package in lithium complex grease and also in polyurea grease. Boundary lubrication films composed of Fe(OH)O, Fe₃O₄, FePO₄, and compounds containing the P鈥揙 bonds were formed on the worn surface, which resulted in excellent friction reduction and antiwear performance.