润滑添加剂三乙醇胺硼酸酯的摩擦学特性研究

三乙醇胺硼酸酯是一种新的绿色水基全合成切削液防锈添加剂,但其在切削加工过程中的摩擦学特性尚未有报道。以钛合金与硬质合金为摩擦副,通过摩擦磨损试验比较三乙醇胺硼酸酯并与传统润滑添加剂丙三醇和聚乙二醇的摩擦学性能,同时考察不同含量的三乙醇胺硼酸酯水溶液的摩擦学性能。结果表明:三乙醇胺硼酸酯具有与丙三醇和聚乙二醇相似的减摩抗磨性能,在相对较高的载荷下,三乙醇胺硼酸酯的润滑性能更优;三乙醇胺硼酸酯水溶液的减摩抗磨性能随着其含量的增加逐渐增强,当三乙醇胺硼酸酯的体积分数达到40%以上时,溶液的润滑性能更为显著。研究表明,三乙醇胺硼酸酯有可能成为一种新型切削液润滑添加剂。     

含氮硼酸酯添加剂的研究现状

对含氮硼酸酯的性能及研究现状进行了概括 ,在硼酸酯的分子结构中引入氮原子 ,使氮原子上的孤对电子与硼原子配位形成N→B配位键 ,从而提高硼酸酯的水解稳定性是目前研究最多的提高硼酸酯水解稳定性的方法。尤其是在分子中引入氮元素 ,形成环状内配体时 ,能够更有效的解决这一问题 ,并有效的提高了添加剂的摩擦学性能。     

硼酸酯在水基切削液中的应用

概述了硼酸酯的性质,综述了硼酸酯在水基切削液中作为润滑添加剂、表面活性剂、防锈剂和杀菌剂的应用情况,并对硼酸酯的应用前景进行了展望。     

有机硼酸酯水解稳定性的考察方法--红外光谱法

本文在结合前人理论的基础上，首先合成了两种有机硼酸酯，然后提出了用红外光谱法考察有机硼酸酯添加剂的水解稳定性的实验方法，并用该方法考察了所合成的硼化含氮杂环化合物添加剂的水解稳定性。试验结果表明红外光谱法是考察水解稳定性的有效方法。     

含氮硼酸酯添加剂性能研究

合成了四种含氮硼酸酯,对其摩擦学性能和抗腐蚀性能进行了研究,结果表明,B-N添加剂具有优良的抗磨减摩性能和良好的极压性能,同时具有优异的抗腐蚀性能。XPS表面分析表明,B-N添加剂在磨痕表面形成了一层含B2O3、BN、O-Fe-B,氧化铁和有机化合物的复杂保护膜。     

硼酸酯化Mannich碱抗磨添加剂的性能研究

本文介绍了一种新型抗磨添加剂－硼酸酯化Ｍａｎｎｉｃｈ碱，并用四球机对其减摩抗磨性能进行了考察。结果表明，该添加剂具有优良的减摩抗磨性，在冲压拉深油中与其他添加剂有很好的复合配伍性，能普遍提高原油品的最大无卡咬负荷和降低磨斑直径。     

复合硼酸酯添加剂在水基切削液中的作用

随着现代切削加工技术的发展和应用,人们对切削液提出更新、更高的要求,即切削液不但应具有优良的冷却、润滑、防锈和清洗功能,而且还应使用周期长,溶液透明便于观察,且无毒(或低毒),对环境无污染(或低污染)。切削液的这些性能主要取决于切削液中的添加剂。传统的添加剂已不能完全满足要求。近年来,有机硼酸酯作为一类新型的多功能添加剂受到国内外的重视,本文介绍的复合硼酸酯,用试验的方法考察了它的摩擦磨损性能、防锈性能和杀菌性能,并将其     

含磷酸三甲酚酯的季戊四醇酯水解安定性的研究

为研究磷酸三甲酚酯(TCP)添加剂对季戊四醇酯(PE)酯类油水解安定性影响的规律及机制,采用美国ASTM D2619-09"饮料瓶法"对含有不同质量分数TCP添加剂的PE进行加速水解实验,检测不同水解时间油层酸值、水层酸度、铜片质量及外观变化,总结其水解变化规律;采用红外光谱仪对水解产物进行分析,探讨其水解机制。结果表明:油层酸值随水解时间呈指数增长,水层酸度随时间呈线性增长,铜片腐蚀随时间逐渐严重,且3种指标均随TCP含量的增加而增大;红外分析表明,在PE水解的同时TCP也发生水解,且生成的磷酸使H+增加,加速催化了PE的水解。     

含氮硼酸酯添加剂的合成及其摩擦学性能研究

合成了3种含有烷基醇酰胺基团的含氮硼酸酯,并利用红外光谱对其主要官能团进行了鉴定;考察了它们的水解稳定性能,利用四球试验机考察了它们在150SN基础油中的摩擦学性能,并采用扫描电子显微镜观察分析钢球磨斑表面形貌.结果表明:将烷基醇酰胺基团引入硼酸酯分子结构中能有效改善硼酸酯的水解稳定性能;含氮硼酸酯具有较好的极压抗磨性能,并具有较好的抗腐蚀性能.     

Tribological Performance and Surface Analysis of a Borate Calcium as Additive in Lithium and Polyurea Greases

In this work, a borate calcium additive was added to lithium and polyurea greases to investigate the tribological performance. Friction and wear tests were conducted on a four-ball machine under higher load and a reciprocating tribometer under lower load. X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) analyses were performed on the worn surface after the tests. It was found that the tribological performance affected the boundary layers formed by the additive and the soap fibers. The boundary films in lithium grease mainly consist of ferrum hydroxide, and more oxide can be found in polyurea-based films. SEM analyses of soap fibers show that the soap fibers in polyurea-based grease were more separated than those in lithium-based grease. Compared to the base grease, the soap shows smaller and shorter fibers.     

内燃机润滑油添加剂抗磨损能力及其对发动机性能影响的试验研究

本文通过对几种选型的发动机润滑油添加剂的专用摩擦磨损试验机试验和发动机呆性能对比试验,证实了此类机油添加剂的减磨作用效果。分析了两种志用摩擦磨损试验机的试验结果与发动机性能试验结果的对应关系,从而提出了进一步试验研究的方向。     

拉深润滑剂的摩擦特性及其影响因素

本文采用自行设计的探地法测定摩擦系数，模拟板粒拉深变形条件下所测得的润滑剂润滑性能与传统的测试方法进行比较，能起初的反应塑料为形工况条件，其结果与生产实际情况十分吻合。     

Effects of Magnesium Borate Whiskers on the Antiwear and Mechanical Performance of Natural Rubber

Magnesium borate whiskers (MgBWs) are utilized to improve the antiwear and mechanical performance of natural rubber (NR). The results suggest that the wear resistance of the vulcanizates was increased significantly and the mechanical performance of the vulcanizates was increased to some extent with the inclusion of MgBW. Bis-(3-[triethoxysilyl]-propyl)-tetrasulfide (Si-69) and tea polyphenols (TPs) were used to improve the inferior interface between MgBW and the NR matrix and their effectiveness and the relationship of structures and the properties were explored. The micrographs illustrate that the interfacial interactions between the whiskers and matrix were obviously enhanced after surface modification by Si-69. With the incorporation of TP, the wear resistance of the vulcanizates was further increased. The present investigations attribute the improvement of antiwear properties of NR to the high antiwear ability of whiskers and the improved mechanical performance of the vulcanizates.     

Study of Influence of Lubricating Oil and Tooth Height on Friction Characteristics of Helical Gears

It is of utmost importance to know the friction loss of helical gears because they are produced quite widely used. However, basic research, e. g., load carrying characteristics of helical gears and friction loss, is extremely scarce.

In this paper the authors focused on the influence of the kind of lubricating oil on the friction loss of helical gears. Further they dealt with the influence of height of teeth on friction loss of helical gears. The authors carried out experiments to study the influence of lubricating oil viscosity, additive, and base oil type as well as rotational speed on friction loss of helical gears. Not only mineral oils but also synthetic oils were used as base oils, e. g., paraffin, poly-α-olefin, and polyglycol type oils. As additives the authors used EP additive and ZnDTP. Further they investigated the influence of tooth height on friction loss.

The experimental results gained make it possible to drastically reduce friction loss of helical gears.     

不同润滑条件对塑料合金轴承摩擦磨损性能的影响

用MPV 2 0 0型摩擦磨损试验机对超高分子量聚乙烯 (UHMW PE)塑料合金轴承在水润滑介质不同含沙量的条件下进行了摩擦学性能测定 ,分别考察了载荷、速度以及运行时间等对合金轴承摩擦学性能的影响。为水润滑合金轴承的实际应用提供理论指导。     

Synergetic Effect of Lubricant Additive and Reinforcement Additive on the Tribological Behaviors of PEEK-Based Composites under Seawater Lubrication

Polyetheretherketone (PEEK)-based composites reinforced with lubricant additive (polytetrafluoroethylene, PTFE) and reinforcement additives including carbon fiber (CF), glass fiber (GF), and bronze powder were prepared using a hot-press molding technique. The synergetic effects of different additives on the tribological behaviors of PEEK-based composites sliding against 316 steel under seawater lubrication were investigated systematically using a ring-on-block test rig. The results showed that lubricant additive PTFE can decrease the friction coefficient and consequently improved the wear resistance of PEEK under seawater lubrication, especially when the volume fraction of PTFE was about 20%. It was also found that the incorporation of CF can further improve the wear resistance of PEEK blended with 20% PTFE, especially under high load and high sliding speed. This suggested that a synergistic effect on improving the wear resistance of PEEK existed between PTFE and CF, which originated from good lubrication of PTFE, good reinforcement of CF, and good interfacial combination between CF and PEEK-20%PTFE. However, two other reinforcement additives of GF and bronze powder had an antagonistic effect but not a synergetic effect with PTFE; that is, the incorporation of the two additives greatly deteriorated the wear resistance of PEEK blended with 20% PTFE.     

Antiwear Tribofilm Formation on Steel Surfaces Lubricated With Gear Oil Containing Borate,Phosphorus, and Sulfur Additives

The formation of antiwear tribofilms plays a critical role in the longevity of automotive gears. The focus of this experimental study was on the lubrication efficacy of gear oils with different contents of borate-, phosphorus-, and sulfur-containing additives leading to the formation of protective tribofilms. Experiments were performed with AISI 52100 steel balls sliding against AISI 52100 steel disks in baths of different oils at ambient (～32 °C) and elevated (～100 °C) temperatures under load and speed conditions favoring sliding in the boundary lubrication regime. Friction coefficient responses accompanied by electrical contact voltage measurements provided real-time information about the formation and durability of the antiwear tribofilms. The wear resistance of the tribochemical films was quantified by wear rate data obtained from surface profilometry measurements of wear tracks on the disk specimens and sliding tests performed at ambient temperatures after the formation of the tribofilms during elevated-temperature sliding. Results indicate a strong dependence of tribofilm formation on temperature and type of additives. The slightly lower friction and higher wear resistance obtained at elevated temperatures with blended oils is attributed to the increased chemical reactivity of additives containing borate, phosphorus, and sulfur, leading to the formation of durable tribofilms. Relatively higher wear resistance and faster tribofilm formation were obtained with the borate-enriched gear oil formulations.