黏结石墨基固体润滑涂层在油介质中的摩擦学性能

为了探讨聚酰亚胺黏结石墨基固体润滑涂层在油介质中的摩擦学性能及其作用机制,采用MHK-500型摩擦磨损实验机对聚酰亚胺黏结石墨基固体润滑涂层在4种油介质(RP-3煤油、0#柴油、液体石蜡和SG 15W-40机油)中的摩擦磨损性能进行评价,并对其机制进行初步的探讨。结果表明:与干摩擦相比,涂层在4种油介质中的摩擦学性能都有显著提高,其中在柴油介质中涂层的抗磨性能提高最为突出,可能的原因是中等黏度的柴油介质在摩擦界面能形成足够厚的油膜,又能对涂层进行有效的冷却;同种油介质中,涂层在高速(2.56 m/s)、低载(1 120 N)下的耐磨性能明显优于低速(1.54 m/s)、高载(2 120 N)下的耐磨性能。     

Lubrication Effect of the Paraffin Oil Filled with Functionalized Multiwalled Carbon Nanotubes for Bismaleimide Resin

Multiwalled carbon nanotubes (MWCNTs) were functionalized and were used as additives in paraffin oil to improve its lubrication effect for bismaleimide resin. The tribological behavior of bismaleimide resin lubricated by the paraffin oil filled with the functionalized carbon nanotubes was investigated by friction and wear tester. The wear surface of the resin with steel ball as tribopair was analyzed by means of scanning electron microscopy (SEM). It was found that the addition of this kind of functionalized MWCNTs effectively reduced the friction coefficient. An optimal additive concentration existed in the system and was found to be 0.025 wt%. A lubrication model for the resin and steel ball system was postulated and it was the isolating effect and bearing structure of f-MWCNTs that played a key role in friction and wear reduction.     

Tribological properties of molybdenum disulfide nanosheets by monolayer restacking process as additive in liquid paraffin

Molybdenum disulfide nanosheets were prepared by monolayer restacking process. Results of transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM) showed that the obtained MoS₂ nanosheets had a thickness about 30-70 nm. The tribological properties of the so-prepared MoS₂ nanosheets were investigated on a MQ-800 four-ball tribometer. The results showed the base oil with MoS₂ nanosheets had better friction reduction, wear resistance and extreme pressure than those with commercial micro-MoS₂. The good tribological properties of MoS₂ nanosheets were mainly ascribed to the surface effect and the dimension effect of nanoparticles. Moreover, the formation of MoO₃ and FeSO₄ complex film on the rubbed surface also played an important role in friction reduction and wear resistance.     

油酸修饰PbS纳米粒子的摩擦学性能剖析

合成了基础油中分散性良好的油酸（OA）修饰PbS纳米粒子，并用四球摩擦磨损试验机考察了其作为润滑油添加剂的摩擦学行为，结果表明，OA修饰PbS纳米粒子在较低的添加浓度下就具有良好的减摩和抗磨效果，未修饰PbS纳米粒子作为润滑油添加剂时有一定的减磨作用，而修饰剂油酸则具有一定的抗磨性能。     

油润滑条件下有机物修饰纳米铜颗粒改善铁基摩擦副摩擦磨损的研究

在球盘式摩擦磨损试验机上考察了有机物修饰的纳米铜颗粒作为50CC润滑油添加剂的摩擦学性能;采用SEM和EDS分析了磨损表面形貌和表面膜元素组成。探讨了纳米铜颗粒的摩擦学作用机制：结果表明：有机物修饰的纳米铜颗粒作为添加剂能显著改善50CC润滑油的抗磨减摩性能,含0．05％纳米铜油样润滑下的摩擦因数与磨损量同基础油润滑下相比分别降低了27．6％与60％。分析后认为,纳米铜颗粒通过对摩擦表面进行修复及在摩擦表面成膜两种作用有效地改善了摩擦磨损性能。     

点/线/面接触条件下喹唑啉酮胺润滑油添加剂的摩擦学性能

目前杂环化合物作为润滑油添加剂在机械润滑领域受到重视,但对无硫磷含氮杂环化合物在多种接触方式下的摩擦学性能的研究还不多。合成一种新型无硫磷喹唑啉酮胺润滑油添加剂并利用四球试验机、环块试验机和万能摩擦磨损试验机分别考察了点/线/面接触条件下其在液体石蜡中的摩擦学性能,再用光学显微镜、扫描电子显微镜和X射线光电子能谱仪对其摩擦表面进行分析。试验结果表明:油溶性喹唑啉酮胺在液体石蜡中能显著改善基础油的摩擦磨损状况,明显提高基础油的承载能力,表现出良好的摩擦学性能,其作用机理是其在摩擦过程中与金属表面发生了摩擦化学反应,生成了含氧化亚铁、有机氮化物和含氮金属配合物等的复合膜,有效地提高了液体石蜡的减摩抗磨性能。     

Study on antiwear and reducing friction additive of nanometer ferric oxide

Amorphous ferric oxide with a particle size of about 20–50 nm was prepared using the ethanol supercritical fluid drying technique. The tribological properties of 500 SN oil containing nanometer particles were measured using four-ball and block-on-ring tribotesters. Results indicated that the wear resistance and load-carrying capacity of the oil was raised and its friction coefficient was decreased. Excessive nanometer additive was disadvantageous for the load-carrying capacity of lubricating oil. The dispersing agent played an important role in the improvement of the tribological properties, and copper stearate was markedly superior to sorbitol monostearate. Nanometer ferric oxide took effect by its deposition on the rubbing surface.     

基于正交试验的含氮硼酸酯铝材轧制润滑油摩擦学性能研究

合成一种新型含氮硼酸酯铝材轧制润滑油添加剂,利用四球试验机考察添加含氮硼酸酯的铝材轧制润滑油的油膜强度、摩擦因数,通过显微镜观察磨斑形貌并测量磨斑直径。利用正交试验法评估极压剂含量、基础油种类、四球试验机载荷和转速对含氮硼酸酯润滑油摩擦学性能的影响,并通过多目标优化设计,对4种参数对铝材轧制润滑油摩擦学性能的强化效果进行综合研究。结果表明:各工艺参数对油样的摩擦学性能影响显著性由大到小依次为极压剂添加量、基础油种类、转速和载荷;经过多目标优化设计,得到的含氮硼酸酯铝材轧制润滑油强化工艺参数的最佳组合:极压剂质量分数为1.0%,基础油种类为D100,载荷为294 N,转速为1 200 r/min;通过极差、方差等分析,发现极压剂添加量和基础油种类对油样的摩擦学性能有显著影响。     

添加纳米Fe3O4 润滑剂磨损性能试验研究

采用化学共沉淀发制备了纳米级铁磁流体润滑剂,利用MMW-1万能摩擦磨损试验机,测定了添加纳米Fe3O4润滑剂在不同速度、添加量和载荷下的摩擦学性能,并对减摩抗磨机制进行了研究。结果表明,添加纳米Fe3O4粒子的润滑油表现出了良好的抗磨减摩性能,并能够显著改善基础油的承载能力,最大可以提高16．5％。其减摩抗磨机制为,由于纳米微粒大多为球状,能起到类似“球轴承”的作用,从而提高润滑性能;另外,由于纳米颗粒的增粘作用,从而提高承载能力。     

Tribological performance of graphite containing tin lead bronze-steel bimetal under reciprocal sliding test

As a solid self-lubricating material to serve under heavy load and low velocity, graphite containing tin lead bronze-steel bimetal composites were prepared using the powder metallurgy (P/M) technique. Effects of graphite content on tribological performance under reciprocal sliding were studied using the UMT-2MT tribo-meter. The optimal performance of average friction coefficient, maximum friction coefficient, friction coefficient amplitude and wear resistance can be achieved at the graphite content of ∼3 wt%. Appropriate graphite content and hardness are the two most crucial factors to achieve a good quality lubricating film on the worn surface and hence the desired solid lubrication performance.     

Exploration on tribological behaviours of perrhenates as potential lubricating oil additive during a wide temperature range

The perrhenates of calcium, copper and lead used as oil additive were synthesised by using the aqueous solution method. The tribological properties of these perrhenates were examined by using a ball‐on‐disc tribotester during a wide temperature range and a four‐ball testing machine at room temperature. The four‐ball test results showed that all synthesised perrhenates presented good extreme pressure property to a certain degree and demonstrated satisfactory wear resistance at room temperature. The ball‐on‐disc experiment results showed that the base oil with perrhenate additives significantly decreased friction and wear compared with pure base oil at elevated temperatures. An antifriction and low‐shear layer was verified to form on sample surface after testing under high temperature. This layer effectively prevented the direct contact of sliding surfaces and decreased the friction coefficient. The antifriction behaviour of perrhenates implied that they could be developed as the candidate of oil additives for a hybrid lubricating mode. Copyright © 2015 John Wiley & Sons, Ltd.     

聚合十六烷氧基硼酸钾的合成及作为润滑油抗磨减摩添加剂的摩擦学性能

本文合成了一种含硼及钾的油溶性化合物-聚合十六烷氧基硼酸钾并将其用作润滑油抗磨减摩添加剂,用四球及环块摩擦试验机研究了它的摩擦学性能.结果发现:500SN基础油的抗磨性能得到明显改善,其承载能力明显提高,摩擦系数明显降低,有—最佳添加剂含量,超过此量,油品的承载能力不升反降.将磨斑分别在石油醚及蒸馏水中用超声波清洗后用扫描电子显微镜表征,结果发现磨斑表面存在有含硼沉积物.聚合十六烷氧基硼酸钾在表面发生了摩擦化学反应,如分解、缩合等,这些反应产物形成了一层具有抗磨减摩性能的膜.     

废润滑油/再生润滑油的摩擦学性能

使用可见分光光度计初步评价实验室自主研发工艺处理得到再生润滑油的质量,采用四球摩擦磨损试验机考察再生润滑油的摩擦学性能并与废润滑油、新润滑油进行对比研究,借助扫描电子显微镜对磨斑表面形貌进行观察分析,对再生润滑油的抗磨减摩与润滑机制进行探讨。结果表明,废润滑油摩擦学性能严重下降,较新润滑油摩擦因数升高26%以上,磨斑直径增大58%以上;再生润滑油表现出了优良的减摩抗磨性能,较废润滑油摩擦因数能够降低25%,磨斑直径可减小50%左右,基本达到了新润滑油的水平。     

Effect of lubricants on the friction and wear of Al2O3 against gray cast iron

The tribological behavior of ceramic Al₂O₃ coupled with gray cast iron (PHT) with different lubricants was investigated using a ring-on-block wear tester. In the wear test, air, distilled water, emulsion and oil were used as lubricants respectively in order to check the lubricating effectiveness of lubricants and the friction mechanism of solid graphite in the cast iron. Wear testing of 0.8% C steel (T8) sliding with Al₂O₃ was also carried out to compare with the test using gray cast iron. From these data the tribological behavior of graphite in the iron can be evaluated. The results show that the friction and wear of tested couples are decreased using different lubricants in the following order: air, distilled water, emulsion and oil. When lubricating with air and water, graphite in the iron as solid lubricant can decrease the friction and wear of the couples. However, when lubricating with emulsion and oil, graphite does not show the advantage of decreasing friction and wear.     

Combination of DLC coatings and EP additives for improved tribological behaviour of boundary lubricated surfaces

The aim of the present investigation was to obtain some further understanding of the mechanism responsible for low-friction behaviour of W-containing DLC coatings (W-DLC) when lubricated with EP additivated oil. Boundary lubricated wear and friction tests were performed under reciprocating sliding motion using a high frequency test rig and a contact pressure of 1.5 GPa. Additionally, some of the tests were performed in a load-scanning reciprocating test rig, with the contact pressure being in the range from 2.4 to 5.6 GPa. The influence of concentration of a sulphur-based EP additive on the friction behaviour was investigated.This investigation showed that W-DLC coatings greatly improve the tribological properties of boundary-lubricated surfaces, especially when pairing coated and uncoated steel surfaces. The improved tribological behaviour was found to be governed by the gradual formation of a WS₂ type tribofilm on the steel counter-face or on revealed steel substrate. The friction level depends on the additive concentration.     

表面修饰纳米铜粒子的制备及其摩擦学性能

以微乳化化学还原法制备出表面修饰纳米铜粒子,它们在基础油中显示出良好的油溶性,在苯、甲苯等有机溶剂中有良好的分散性和分散稳定性。用四球摩擦磨损试验机考察了其在26#白油中的摩擦学性能,并对其摩擦化学作用机制进行了研究。结果表明,表面修饰纳米铜添加剂具有良好的抗磨和承载能力。磨斑的表面分析表明,纳米铜添加剂在边界润滑下形成了一层厚度约为13nm含单质铜的沉积膜是其具有良好摩擦学性能的主要原因。     

有机钼复合添加剂摩擦磨损性能的研究

以合成的有机钼与碱性石油磺酸钙按一定的配比，制备了复合添加剂加入到基础润滑油中，在四球摩擦试验机上测试了其摩擦磨损性能。结果表明，这种复合添加剂可使基础油的摩擦系数显著降低，可较大地提高基础油的承载能力和抗磨损性能，并有效地抑制温升。     

两种纳米粒子组合物用作润滑油添加剂

选择了纳米碳酸钙和纳米稀土两种粒子组合物作为润滑油抗磨、极压添加荆，采用透射电子显微镜（TEM）分别检测了其粒径大小，采用四球摩擦磨损试验机测定了含组合纳米粒子的润滑油的摩擦学性能，采用X射线光电子能谱仪分析了磨损钢球表面化学组成。结果表明：含组合纳米粒子的润滑油具有良好的抗磨减摩效果，纳米碳酸钙、纳米稀土组合粒子的最佳的添加量为CaCO3Wt％：RE Wt％=1：1，总浓度为0．6％；大小粒子配合协同作用起到有效的抗磨、减摩效果。还探讨了组合纳米粒子润滑油的抗磨减摩机理。     

六方氮化硼负载纳米铜润滑添加剂的制备及其摩擦学性能研究

采用水热吸附及热解还原制备六方氮化硼负载纳米铜复合润滑添加剂(Cu/h-BN),利用透射电镜(TEM)、X射线衍射仪(XRD)、热重分析仪(TGA)以及红外光谱仪(FT-IR)对样品进行表征.将纳米润滑添加剂分散到聚α-烯烃(PAO10)中,采用球盘摩擦试验考察其摩擦学性能.采用扫描电子显微镜(SEM)对典型的磨痕进行...     

纳米铜润滑添加剂在四球机上的摩擦学性能研究及机理探讨

用MRS-10J四球摩擦磨损试验机考察了N68基础油和添加了自修复纳米铜润滑添加剂NT1的N68NT1的摩擦学性能,用扫描电子显微镜（SEM）、x射线能量色谱仪（EDS）分析了钢球表面的磨斑形貌和组成,同时初步分析了纳米铜润滑添加剂的润滑机理.结果表明：自修复纳米铜润滑油添加剂NT1能显著改善N68基础油的摩擦学性能;在载荷为296 N、392 N、490 N,试验时间为30 min的试验条件下,摩擦副的摩擦因数同基础油的相比分别下降了33.8%、39.4%和55.5%;钢球的磨斑直径分别下降了46.5%、45.6%和32.5%;同N68相比,N68NT1的pB值提高了33.3%;这可能同摩擦过程中钢球表面上沉积膜的协同作用有关.