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Synergistic and antagonistic effect of sulfur-based additives on the performance of greases with ZDDP and PTFE.

机译：硫基添加剂对ZDDP和PTFE润滑脂性能的协同和拮抗作用。

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摘要

Lithium-base greases constitute about 50% of the grease market. The current trend is towards developing greases with longer working life and wider application flexibility. To address this concern, greases are blended with antiwear and extreme pressure (EP) additives that serve to reduce wear and increase the operating life of the machinery by creating a low strength, shearable film on the moving surfaces. In the current study, greases were developed to address the need for both performances as prescribed by the ASTM standards D2266 and D2596, respectively.;The actual bearing conditions vary significantly with load, rpm and duration of test. These three factors have important consequences such that the load dictates the activation of chemistries, the rpm controls the entry of grease into the contact point and the durability of grease is governed by the test duration. Accordingly, greases with good antiwear and extreme pressure properties were developed and their behavior studied under both standard ASTM conditions as well as by varying test conditions of load, rpm and test duration. For achieving both wear and load-bearing capacity, a multitude of additives have been investigated with varying degrees of success. The major among these are MoS2 and graphite to impart extreme-pressure properties to greases, polytetrafluoroethylene (PTFE) for friction reduction and ZDDP for wear reduction. With the intent to replace MoS2 in greases, the synergistic combination of ZDDP and PTFE has proven to provide superior wear and EP performance and appear to be more durable than their MoS2 counterparts. The interactions among these additives have been analyzed through design of experiments using the factorial and response surface design approaches. This approach would give the grease-maker preliminary, yet critical, information about suitable chemistry to employ under specific conditions of load, rpm and duration of test.;To develop greases that provide both wear and weld protection, the sulfur additives probably the earliest known EP compounds in lubricants, were tested for interactions with ZDDP and PTFE combination. Since the wear or EP action involves the interposition of a film between mating metal surfaces in order to prevent metal-to-metal contact, the film was analyzed for compositional and morphological features through extensive SEM/EDS experiments. It was deduced that formation of sulfides was important for wear and phosphate pads for load-bearing characteristics. Through this work, four different aspects of the greases have been identified; (1) the design of experiments approach is used to develop an understanding of the interaction of the role played by various additives singly or in conjunction with other additives, (2) the role played by test conditions on the evaluation of grease properties is dealt with, (3) the role played by sulfur chemistries when used with solid lubricants like PTFE is addressed and (4) an understanding on the interaction of various chemistries is established with the goal of developing a Universal grease.
机译：锂基润滑脂约占润滑脂市场的50％。当前的趋势是开发具有更长使用寿命和更广泛应用灵活性的润滑脂。为了解决这一问题，将润滑脂与抗磨和极压（EP）添加剂混合在一起，可通过在运动表面上形成低强度，可剪切的薄膜来减少磨损并延长机械的使用寿命。在当前的研究中，开发了润滑脂来满足ASTM标准D2266和D2596分别规定的两种性能的要求。实际的轴承状况会随负载，转速和测试持续时间而显着变化。这三个因素具有重要的后果，例如，负载决定了化学物质的活化，转速控制着油脂进入接触点，而油脂的耐用性则取决于测试的持续时间。因此，开发了具有良好抗磨性和极压性能的润滑脂，并在标准ASTM条件下以及通过改变负载，rpm和测试持续时间的测试条件对润滑脂的性能进行了研究。为了达到耐磨和承重能力，已经研究了多种添加剂，并取得了不同程度的成功。其中主要的是MoS2和石墨以赋予润滑脂极压性能，聚四氟乙烯（PTFE）可以减少摩擦，ZDDP可以减少磨损。为了替代润滑脂中的MoS2，已证明ZDDP和PTFE的协同结合可提供出色的耐磨性和EP性能，并且比MoS2同类产品更耐用。这些添加剂之间的相互作用已通过使用阶乘和响应曲面设计方法的实验设计进行了分析。这种方法将为油脂制造商提供有关在特定负载，转速和测试持续时间的特定条件下采用的合适化学的初步但至关重要的信息。；要开发出既能提供磨损和焊接保护的油脂，则硫磺添加剂可能是最早知道的测试了润滑剂中的EP化合物与ZDDP和PTFE混合物的相互作用。由于磨损或EP作用涉及在相配的金属表面之间插入薄膜以防止金属与金属的接触，因此通过广泛的SEM / EDS实验分析了薄膜的成分和形态特征。据推断，硫化物的形成对于磨损和磷酸盐垫层的承重特性很重要。通过这项工作，已经确定了润滑脂的四个不同方面。 （1）通过设计实验方法来理解各种添加剂单独或与其他添加剂一起发挥的作用，（2）处理测试条件对润滑脂性能评估的作用，（3）解决了硫化学在与PTFE等固体润滑剂一起使用时所起的作用，以及（4）建立了对各种化学相互作用的理解，目的是开发通用润滑脂。

著录项

  • 作者

    Suresh, Arunya.;

  • 作者单位

    The University of Texas at Arlington.;

  • 授予单位 The University of Texas at Arlington.;
  • 学科 Materials science.
  • 学位 M.S.
  • 年度 2009
  • 页码 173 p.
  • 总页数 173
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:34

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