Models of thermodynamic and transport properties of POE VG68 and R410A/POE VG68 mixture

The thermodynamic properties of a refrigerant-oil mixture are the foundation to predict the performance of air-conditioning and refrigeration systems and to evaluate the influence of oil on heat transfer and pressure drop. Models of the thermodynamic and transport properties of POE VG68 and R410A/POE VG68 mixture were provided based on the analysis of state-of-the-art correlations. New models were developed by modifying the coefficients in existing correlations with multiple regression method according to experimental data. The maximum deviation of the predicted values of these models to the experimental data is within 5%. These models can be used for R410A/POE VG68 to obtain accurate and reliable thermodynamic and transport parameters to evaluate the influence of POE VG68 on the performance of an R410A air-conditioning and refrigeration system. __________ Translated from Journal of Shanghai Jiaotong University, 2007, 41(3): 404–410 [译自: 上海交通大学学报]     

低温微量润滑冷却装置的设计

伴随日益要求严苛的环保要求,企业在加工零件时需要用到大量的绿色制造技术。低温微量润滑加工技术作为一种新型的切削技术,符合绿色制造的要求并大量应用于生产过程中。介绍一种低温微量润滑冷却的气动-液压系统,主要利用微量润滑技术和涡流制冷技术,从气动-液压系统及电气三方面对样机进行设计并完成相关实验。所得实验成果对微量润滑装置的再升级具有一定的参考意义。     

减摩剂对汽油机油节能减摩性能影响研究

简要介绍了润滑油节能减摩技术，并利用润滑油摩擦系数测定试验法和程序ⅥA台架对汽油机油的节能减摩性能进行了研究，分别讨论了油品粘度和摩擦改进剂对润滑油节能减摩技术的影响。     

Lubricant effects on strain fields of seven wire strands subjected to tensile load

As a part of an extensive analysis on strand behaviour the lubricant effect in strain fields was examined. The strains were measured by using electrical resistance strain gauges. The results obtained, by loading the unlubricated and lubricated sample both statically and quasi-statically, showed relevant effects caused by different contact loads developed among the wires. By examining the strains measured during the severing of one helical wire the inapplicability to the strands of one Italian regulation relative to wire ropes, was also confirmed.     

AlCl3/TiCl4催化癸烯聚合制润滑油基础油的研究

以AlCl3/TiCl4为催化剂对癸烯聚合制润滑油基础油进行了研究。考察了催化剂用量、Al与Ti摩尔比、反应时间和反应温度等工艺条件对合成油性质的影响，并比较了不同催化剂、不同烯烃原料对聚α-烯烃(PAO)性质的影响。结果表明，癸烯聚合制备PAO，AlCl3/TiCl4是较适宜的催化剂。PAO收率随着AlCl3/TiCl4催化剂用量的增大、反应温度的升高以及反应时间的延长而提高，但随着Al与Ti摩尔比的增加而迅速下降；粘度指数在所考察的条件范围内均较高；100 ℃下的运动粘度随着Al与Ti摩尔比的变化而急剧变化，因此可以根据需求，通过调节Al与Ti摩尔比，可制备各种粘度等级的PAO产品。     

润滑油清净剂的超重力合成过程及产品性质评定

将超重力技术原理与润滑油清净剂合成反应机理相结合，提出利用超重力反应器原位制备高碱值石油磺酸钙清净剂的新工艺，研究了超重力法原位制备高碱值石油磺酸钙清净剂的工艺流程及作用机理，并对所制备的样品进行评定，结果表明制备的样品满足SH/T 0042-1991一级品标准要求。冷冻蚀刻观测结果表明，碱性石油磺酸钙胶体结构中碳酸钙晶体的粒径为10~30nm，平均粒径为20 nm，纳米尺度效应明显，产品具有良好的透光性和流动性。     

谈纸厂机械设备润滑剂的合理选用

纸厂机械设备主要用润滑油或润滑脂来润滑,正确选择和使用润滑油脂是做好纸厂机械设备润滑工作的关键。对润滑油脂的选用方法和使用要点作了简要的论述。     

Tribological properties of pulsed laser deposited Mo-S-Te composite films at moderate high temperatures

Tribological investigations of Mo-S-Te composite films were conducted on films grown at room temperature by pulsed laser deposition. The chemistry and microstructure of the films were characterized by X-ray diffraction, scanning electron microscopy, X-ray energy dispersive spectroscopy, and micro Raman spectroscopy. The films showed a granular morphology and a preferred basal plane growth of 2H-MoS₂ parallel to the substrate after annealing at high temperatures. The friction coefficients of the films were 0.05 at 300 °C and 0.10 at 450 °C for more than 10,000 cycles in air. Smeared hexagonal MoS₂ lubricant films were observed inside wear tracks while the tribochemical formation of wear debris occurred both inside and outside the wear tracks. The Te additives for increasing the film durability were proposed to slow oxidation of the lubricants at elevated temperatures by thermally-induced tellurium migration to the surface and the subsequent formation of the Te diffusion barrier. This mechanism could be significantly effective in high-temperature tribotests because of the increased tellurium mobility at high temperatures.     

未增塑聚氯乙烯(PVC-U)异型材配方基础

PVC-U异型材配方十分复杂,常用原料通常在10种以上。根据大连实德集团实际生产情况,这10多种原料通常以7大组分的方式进行配料和生产。文中就该配方中7大组分的分类、特点及应用情况分别进行了详细介绍。     

模壁润滑温压工艺的研究

对模壁润滑温压工艺进行了较为系统的研究,分析了温度、粉末中润滑剂添加量、模壁润滑剂种类及其浓度等对温压效果的影响.结果表明,粉末温度在100℃时温压效果最好;Fe-1.5Cu-0.5C粉末中添入0.2%内润滑剂时效果最好,而Fe-1.5Ni-0.5Mo-0.5Cu-0.5C粉末中最佳润滑剂含量为0.3%;模壁润滑剂A、B分别适合于较低和较高压制压力条件,2种模壁润滑剂均在浓度低时温压效果较好;在686MPa时,Fe-1.5Cu-0.5C和Fe-1.5Ni-0.5Mo0.5Cu 0.5C粉末分别获得了7.48、7.39g/cm3的压坯密度;模壁润滑温压工艺较适用于压缩性良好的粉末,对压缩性较差的粉末没有优势;模壁润滑工艺的脱模压力比内润滑工艺小35%～45%,可以减少模具损耗.