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A Design of Experiment Approach to Develop a Better Grease

机译:开发更好油脂的实验方法设计

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摘要

Grease is a complex product consisting of soaps, thickeners, antiwear additives, extreme pressure additives, corrosion inhibitors and antioxidants. Many of these ingredients can interact synergistically or antagonistically, resulting in a product which is the sum of its parts or under certain circumstance is a product of the parts and under certain other circumstances lesser of the parts. A traditional approach uses one variable at a time testing that carries the risk that the formulator may find one input variable that has a significant response and fails to discover that changing another variable may alter the response of the first variable. The design of experiment approach plans for all dependencies and prescribes what data is needed to evaluate them and reveals those variables that are single factor variables and those that are multifactor interactions whether synergistically or antagonistically. In this study the interaction between the following variables, Zinc dialkyl dithiophosphate (ZDDP), molybdenum disulfide (MoS_2), poly tetra fluoro ethylene (PTFE) and ferric fluoride (FeF_3) was examined. Ring on block wear tests were used to evaluate the low load wear behavior. Four ball wear tests were used to evaluate wear behavior and 4 ball weld tests were used to evaluate extreme pressure behavior. The block on ring tests indicate that MoS_2 behaves antagonistically and results in increased wear at low loads. On the other hand there is a synergistic interaction between ZDDP, PTFE and FeF_3 resulting in weld loads as high as 800 Kg with very low MoS_2 content. In this study, formulation equations were developed to explain the two and three factor interactions between the constituents. A low cost low MoS_2 grease that has excellent anti-wear and anti-weld characteristics was developed.
机译:油脂是一种复杂的产品,由肥皂,增稠剂,抗磨添加剂,极压添加剂,缓蚀剂和抗氧化剂组成。这些成分中的许多成分可以协同或拮抗地相互作用,产生的产物是其各部分的总和,或在某些情况下是各部分的产物,而在某些其他情况下则是较少的部分。传统的方法是在一次测试中使用一个变量,这种风险具有配方设计师可能会发现一个输入变量具有显着响应且无法发现更改另一个变量可能会更改第一个变量的响应的风险。实验方法的设计针对所有依赖项进行计划,并规定了评估它们所需的数据,并揭示了协同或拮抗的单因素变量和多因素相互作用的变量。在这项研究中,以下变量之间的相互作用进行了研究:二烷基二硫代磷酸锌(ZDDP),二硫化钼(MoS_2),聚四氟乙烯(PTFE)和氟化铁(FeF_3)。环上块磨损测试用于评估低负载磨损行为。使用四个滚珠磨损测试评估磨损行为,使用四个滚珠焊接测试评估极端压力行为。振铃试验表明,MoS_2具有相反的性能,并在低负载下导致磨损增加。另一方面,ZDDP,PTFE和FeF_3之间存在协同作用,导致焊接载荷高达800 Kg,而MoS_2含量却非常低。在这项研究中,制定了公式方程来解释成分之间的两个和三个因素相互作用。开发了具有优异的抗磨损和抗焊接特性的低成本低MoS_2润滑脂。

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