表面修饰的纳米La_2O_3在CC级柴机油中的摩擦学性能研究

研究了纳米La2O3和邻苯二胺修饰过的纳米La2O3添加剂在CC级柴机油中的摩擦学性能。以XRD和元素分析对修饰前后的纳米颗粒进行结构表征,用四球极压抗磨损试验机考察纳米添加剂的抗磨减摩性能,并与空白CD级柴机油作对比。结果表明,纳米La2O3和表面修饰纳米La2O3均能提高CC级柴机油的极压性能,并能优化其抗磨减摩效果。根据SEM和EDS对磨损表面的分析,可以推断纳米颗粒在摩擦过程中可能会与摩擦副反应生成合金,以此提高摩擦表面的抗磨减摩性能。     

摩擦试验条件对凹凸棒石黏土润滑油添加剂摩擦学性能的影响

采用往复滑动磨损试验机评价凹凸棒石黏土天然矿物材料作为润滑油添加剂的摩擦学性能,利用4因素3水平正交试验方法系统研究摩擦过程中载荷、往复频率、滑动时间和凹凸棒石黏土含量对其作为添加剂的抗磨、减摩性能的影响。摩擦过程中,通过原位测量摩擦表面接触电阻的变化,监测凹凸棒石黏土形成摩擦反应膜的动态形成过程。摩擦学试验结束后,利用扫描电镜(SEM)和X射线能谱仪(EDS)分析磨损表面的形貌与元素组成,探讨凹凸棒石黏土添加剂的减摩润滑机理。结果表明,表面修饰棒状凹凸棒石黏土天然矿物材料作为润滑油添加剂具有优良的摩擦学性能,含凹凸棒石粉体润滑油作用下的摩擦表面形成了一层富含Si、Mg、Al、O等元素的不导电摩擦反应膜,并分布大量纳米尺度的硅酸盐颗粒物,从而显著降低摩擦,减少磨损。摩擦过程中载荷、往复频率、摩擦时间和凹凸棒石添加量4个因素对凹凸棒石添加剂减摩和抗磨性能影响的主次顺序均为:载荷添加量往复频率时间。     

纳米氟硼酸钾润滑油添加剂的摩擦学机理

采用扫描电子显微镜(SEM)、纳米扫描俄歇谱仪(AES)及X射线光电子能谱仪(XPS)对具有良好抗磨减磨性能的纳米氟硼酸钾润滑油添加剂进行摩擦学机理研究。结果表明,基础油添加适量纳米氟硼酸钾颗粒后,其抗磨减摩性能大幅度提高,特别在极压条件(800 N)下磨斑直径可下降50%以上,最大无卡咬负荷(PB值)提高26%。表面分析结果表明,由于在摩擦表面既能形成吸附膜,又能发生摩擦化学反应生成含润滑性能较好的B2O3沉积膜和FeF2渗透层,从而表现出优异的抗磨减摩性能。     

蛇纹石超细粉体作润滑油添加剂的摩擦学性能

考察平均粒径为1.0μm的表面修饰蛇纹石超细粉体作为50CC润滑油添加剂对钢/钢摩擦副的润滑性能,研究超细粉体添加量(质量分数)对摩擦学性能的影响.通过对磨损表面的形貌、元素及微观力学性能分析,探讨蛇纹石超细粉体作为添加剂的抗磨、减摩机制.结果表明,蛇纹行超细粉体可显著改善50CC润滑油的润滑性能,降低钢/钢摩擦副的磨损,其最佳添加量为1.5%.蛇纹石超细粉体的减摩润滑机制在于:1)在铁基摩擦表面形成高硬度、低弹性模量的氧化膜,有效降低接触应力和磨粒磨损;2)释放出Al2O3杂质颗粒嵌入摩擦表面并形成微坑和孔洞,起硬质点颗粒增强与微孔储油的双重抗磨、减摩作用;3)摩擦过程中粉体粒径得到细化,形成具有减摩润滑作用的纳米级蛇纹石"第三体"颗粒.     

AW-1型抗磨节能润滑添加剂

将AW—1型抗磨节能润滑油添加剂以3—4％的比例添加到各类润滑油中,在金属摩擦表面能形成牢固的吸附膜和化学反应膜,从而具有减摩、抗磨作用。 该产品经使用测试表明具有以下优良性能: 1)减少摩擦50％,降低磨损、延长机械设备     

硅铝型天然陶瓷矿物添加剂对柴油机油润滑性能的影响

采用端面式摩擦磨损试验机考察平均粒径约为1μm的羟基硅酸铝(Al2[Si2O5](OH)4)天然矿物微粉作为重载车辆柴油机油添加剂的摩擦学性能,利用SEM、EDS和纳米压痕仪对摩擦表面进行形貌、元素和微观力学性能分析。结果表明,硅酸铝矿物微粉作为柴油机油(50CC润滑油)添加剂具有优异的摩擦学性能,可显著提升50CC润滑油的抗磨减摩性能,且在0.75%(质量分数)的添加量下表现出最佳的摩擦学性能。硅酸铝矿物可在摩擦表面形成一层富含Si、Al、O等元素的摩擦表面膜,该膜层的平均硬度达到7.05 GPa,较基础油润滑摩擦表面平均硬度高69.8%,而平均弹性模量(E)达237.4 GPa,与基体金属相当。     

二烷基二硫代磷酸镨的抗磨减摩机理研究

采用四球机和HQ—1摩擦磨损试验机考察了二烷基二硫代磷酸镨（PrDDP）的抗磨减摩性能,并用X射线能谱仪（EDX）、傅利叶反射红外谱仪（FTIR）、俄歇电子能谱仪（AES）和X射线光电子能谱（XPS）等方法,研究了PrDDP的抗磨减摩机理。结果表明,PrDDP具有良好的抗磨减摩性能,摩擦表面生成的有机镨化合物、金属镨、有机硫化物、硫酸盐、磷酸盐等表面润滑层以及摩擦亚表面生成的镨渗层是抗磨减摩作用的主要原因。     

安达减摩剂

安达减摩剂是由我国研制开发的世界最新一代多效复合润滑油添加剂。它含有多种减摩、抗磨有效物质,当它以3％～4％的比例添加到各类润滑油(脂)中后,能在摩擦表面上形成坚韧的物理、化学吸附膜,具有极高的减摩、抗磨和极压性能。经清华大学摩擦学国家重点实验室、全国节能计量测试技术服务中心等单位对本减摩剂所做的试验     

纳米铜自修复添加剂的制备及其摩擦学性能

采用液相还原法制备纳米铜润滑油添加剂。通过摩擦磨损试验机测试纳米铜添加剂在不同载荷下的摩擦学性能。利用扫描电子显微镜和纳米压痕仪分析纳米铜添加剂的自修复性能和机理。结果表明：纳米铜添加剂为粒径约20nm的球形颗粒，其分散性能稳定，摩擦过程中可以在摩擦表面形成低剪切强度的保护膜，具有良好的自修复性能；高载荷时，添加纳米铜添加剂的润滑油摩擦因数和钢球磨斑直径分别比原基础油减少29．1％和27．4％，表现出良好的抗磨减摩性能。     

新型润滑油添加剂

由西安石油化工厂和多家科研院所研制的新型有机钼与新型有机硼酸酯组成的高科技产品—“金事达”高效减摩抗磨节能润滑油复合添加剂,经在汽车、水泥、机械等行业中使用,表明在润滑油中加入3％～5％的“金事达添加剂,在减少摩擦损耗、增大输     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.