水溶性抗磨剂LR—2的润滑性研究

本文对合成的一种水溶性抗磨剂ＬＲ－２进行了润滑性能评定和抗磨作用机理研究。四球机试验结果表明,该剂在自来水中的浓度达１．０ｍ％时,即显示出较好的润滑性能,当达到３．０ｍ％时,ＰＢ值即达６９６Ｎ;结果还表明,在一定的浓度范围内,ＰＢ值随浓度的增大而增大。通过对四球机试验后钢球磨斑的扫描电镜分析,发现磨斑上的碳元素含量较高,认为是抗磨剂的碳元素在表面上沉积,形成了金属的含碳化合物反应膜,从而增强了表面     

烷氧基硼酸盐的润滑规律

以环己氧基硼酸盐、异辛氧基硼酸盐和十二烷氧基硼酸盐为添加剂,采用MS-800A四球摩擦试验机和HQ-1环-块试验机评价了其摩擦磨损性能,并根据φ=P_B·(1/D)·(1/f)式综合评判其润滑性能,从而揭示烷氧基硼酸盐的结构与性能之间的关系以及相应的润滑规律。     

Lubricity of Rare Earth Compounds in Oil

Ｉｎｒｅｃｅｎｔｙｅａｒｓ，ｔｈｅａｐｐｌｉｃａｔｉｏｎｏｆｒａｒｅｅａｒｔｈｃｏｍｐｏｕｎｄｓｉｎｔｈｅｔｒｉｂｏｌｏｇｉｃａｌｆｉｅｌｄｈａｓｂｅｃｏｍｅｏｎｅｏｆｔｈｅｍｏｓｔｉｎｔｅｒｅｓｔｉｎｇｒｅｓｅａｒｃｈｔｏｐｉｃｓｆｏｒｔｒｉｂｏｌ...     

基于疏水改性纳米碳酸钙的钻井完井液

基于前期提出的自解堵屏蔽暂堵理论,研制出了性能优良的疏水改性纳米碳酸钙,并在此基础上形成了疏水暂堵钻井液。室内评价结果表明,在屏蔽暂堵钻井液中加入1.5%疏水碳酸钙后,滤失量由2.6降为1.2 m L,泥饼厚度由0.4变为0.28 mm,证明疏水暂堵钻井液能够快速形成外泥饼,降低瞬时滤失量。该钻井液在温度低于140℃时滤失性能比较稳定;抗Ca Cl2能力为2.5%,抗一价盐浓度为9.0%,抗黏土含量为14.0%;抑制性能好,能在易坍塌地层使用;润滑效果好,极压膜强度超过190 MPa;形成的泥饼在长期油相浸泡下会产生大量裂纹,后期泥饼自行剥落,从而达到自解堵目的,初始渗透率为50×10-3~1 000×10-3μm2的岩心,其渗透率恢复值均大于90%;体系的毒性都很低,均达到了排放标准。     

Effect of contact lens surface properties on comfort,tear stability and ocular physiology

Aim

Retrospective analysis of different contact lens wearing groups suggests lens surface lubricity is the main factor influencing contact lens comfort. However, the examined commercially available contact lenses differ in material and design as well as surface properties. Hence this study isolates the contribution of lens surface properties using an ultra-thin coating technology.

聚磺润滑防塌钻井液在蠡县斜坡西柳区块的应用

针对冀中坳陷饶阳凹陷蠡县斜坡西柳区块地层岩性特点,结合实验并通过钻井实践,形成并应用了聚磺润滑防塌钻井液.现场应用表明,该钻井液具有较强的润滑性、抑制性和防塌能力,摩阻系数低,油层保护效果好,且流变性能易于调整控制.在该区块已应用该钻井液完成23口井,各井钻井施工均正常,完井作业顺利,无一口井发生卡钻事故,平均井径扩大率为8.51%.该钻井液在该区块的应用取得了良好的技术效益.     

Effect of carbide properties of roll materials on lubricity in cold sheet rolling of low-carbon steel

The prevention of friction pick-up, which often occurs under the condition of high reduction and/or high speed, is required to improve the productivity in cold sheet rolling of low-carbon steel. Therefore, rolls made of high-chromium steels and high-speed steels with different carbide contents are tested in order to evaluate the effect of various properties of the carbide component of the materials on the lubrication characteristics. Coefficients of friction for the reduction in thickness and the limit of the reduction of friction pick-up are measured using the sliding–rolling simulation testing machine developed by one of the authors. The experimental results show that carbides on the surface of the roll can stop the increase in friction pick-up, and that keeping the carbide spacing small is effective in preventing friction pick-up. Because of the effectiveness of carbides, a high-chromium steel roll with controlled carbide morphology is manufactured and applied in a cold tandem mill. The results of the application show that the carbide-controlled roll has an excellent antiseizure property and is effective in improving productivity.     

Alternative and low sulfur fuel options: boundary lubrication performance and potential problems

Studies of alternative fuels at Penn State include biodiesel, dimethyl ether (DME) and low sulfur diesel fuels. The fuel studies include bench tests, laboratory engine tests and vehicle tests. DME was evaluated in a campus shuttle bus operating on its regular campus route. A 25:75 vol% mixture of DME and diesel fuel was used. Laboratory engine tests of oxygenated fuels, including biodiesel, resulted in significant particulate reductions. However, some alternative fuels exhibit low lubricity. Bench tests comparing friction and wear characteristics of the fuels are described.     

pH值对合成切削液润滑性能的影响

本文提出了合成切削液ＰＨ值高会降低切削液润滑性能的观点,并对其作用机理进行了探讨,建议合成切削液的ＰＨ值应控制在８－９。     

Influence of aceto acetic esters and di-carboxylic acid esters on diesel fuel lubricity

This paper presents the impact of acetoacetic esters and di-carboxylic acid esters on the lubrication properties of automotive diesel. Three alkyl acetoacetates and seven di-carboxylic esters were used as lubricating additives on two low sulfur diesel fuels, at seven different concentrations of 50, 100, 500, 750, 1000, 1500 and 2000 ppm. Tribological experiments carried out on the high frequency reciprocating rig (HFRR) showed that only two of the three acetoacetic esters used, provide satisfactory mean wear scar diameter (WS 1.4) of less than 460 μm, at the concentration level of 750 ppm. In the case of di-carboxylic acid esters, the effective concentration was 500 ppm or higher.