含纳米CuO锂基润滑脂摩擦学性能研究

为改善锂基润滑脂摩擦学性能,制备不同添加量纳米CuO改性的锂基润滑脂。采用3H-2000PS2比表面及微孔分析仪对纳米CuO粒子进行表征,采用四球摩擦磨损试验机分析纳米CuO添加量对锂基润滑脂摩擦学性能的影响,采用扫描电镜(SEM)和三维形貌分析仪分析试验后钢球磨痕形貌。结果表明:纳米CuO质量分数为0.60%时锂基润滑脂具有最佳的抗磨减摩效果,摩擦因数和磨斑直径较基础脂分别降低24%和12%;一定添加量下,纳米CuO对磨损表面具有修复作用,含质量分数0.60%纳米氧化铜的润滑脂润滑时,磨损表面具有较低的表面粗糙度和较少的犁沟,表现出最佳的抗磨性能。     

纳米改性油脂润滑材料的空间摩擦学性能

为满足各类空间飞行器高精度、长寿命、高可靠性的要求,空间用润滑脂必须具有优异的空间环境适应性及摩擦学性能。为提高全氟聚醚(PFPE)基润滑脂的摩擦学性能,采用纳米MoS2颗粒对进行改性,并研究改性后润滑脂的耐空间辐照性能。结果表明,在PFPE基润滑脂中添加纳米MoS2颗粒,可以在保证其耐空间辐照性能的同时改善其摩擦学性能。     

混合纳米粒子作为润滑脂添加剂最佳配比的实验研究

在MRH-3型高速环块摩擦磨损试验机上,研究混合纳米粒子Al2O3-Al-Cu和Al2O3-Al-MgO作为润滑脂添加剂的摩擦学性能,通过减摩、表面修复以及抗极压性能实验,确定混合纳米粒子的最佳配比。结果表明:在几种纳米粒子之间的协同作用下,含有混合粒子Al2O3-Al-Cu和Al2O3-Al-MgO的润滑脂具有良好的表面修复、抗极压等摩擦学特性,混合粒子比多数单粒子在减摩方面都具有更好的效果。     

几种金属氧化物纳米粒子作润滑脂添加剂的试验研究

用Falex四球摩擦磨损试验机考察了金红石相与锐钛矿相TiO2、α-Al2O3和γ-Al2O3、钇稳四方相和单斜相ZrO2纳米粒子作为润滑脂添加剂的摩擦学行为。试验结果表明，这些纳米粒子均具有较好的减摩抗磨性能和较高的承载能力(pB值)，其润滑性能与纳米粒子的结构和大小都有一定的关系，而且在添加浓度3％左右时具有最佳的效果。     

油胺修饰镍纳米粒子在锂基脂中的摩擦学性能*

为提高镍纳米粒子作为润滑脂添加剂的减摩和抗磨能力,采用油胺对其进行修饰以减少团聚,通过SEM、FT-IR和XRD对OA-Ni的微观形态和结构进行了表征,利用四球摩擦试验机和TE77往复摩擦试验机考察表面修饰的镍纳米粒子(OA-Ni)对锂基润滑脂摩擦学性能的影响,并探讨其在润滑脂中的减摩抗磨机制。结果表明:制备的油胺修饰镍纳米粒子呈不规则的圆片状,粒径约为100 nm,在润滑脂中有良好的分散性;经油胺表面改性的镍纳米粒子能有效改善锂基脂的摩擦学性能,抗磨和减摩性能分别提升了36.6%和15%。磨损表面分析结果表明,在摩擦过程中油胺修饰的镍纳米粒子在摩擦表面形成了主要成分为Fe2O3、 Fe3O4、NiO、Ni2O3等金属氧化物的摩擦化学膜,提高了锂基脂的摩擦学性能。     

纳米CaCO3、Cu混合物润滑油添加剂的摩擦学性能

采用纳米碳酸钙、纳米铜粒子混合物作为润滑油添加剂，利用四球摩擦磨损试验机考察了含纳米碳酸钙、纳米铜粒子添加剂的润滑油的摩擦学性能；用扫描电子显微镜（SEM）考察了磨痕表面的形貌；用原子力显微镜和扫描电子显微镜（SEM）观察分析了在磨损表面纳米粒子的形态与分布。研究结果表明，纳米碳酸钙、纳米铜的混合粒子的总添加量为0.6％，质量比为1：1时，润滑油具有最佳的摩擦学性能；润滑油中纳米碳酸钙、纳米铜混合物粒子添加剂的优良摩擦学性能与纳米粒子在表面存在形态相关。     

纳米三氧化钼的制备及其抗磨性能研究

以钼酸铵和醋酸为原料合成纳米MoO3,并采用四球机考察纳米MoO3在润滑油、润滑脂中的抗磨性能。结果表明,纳米MoO3与油酸、二烷基二硫代磷酸锌在润滑油中具有良好的抗磨协同效应,在锂基润滑脂中具有良好的抗磨性能,尤其在高添加量和高负荷下作用更为明显。这表明纳米MoO3作为固体润滑剂,能够提高润滑油、润滑脂的摩擦学性能。     

几种纳米粒子作为润滑脂添加剂的试验研究

在MRH-3高速环块摩擦磨损实验机上,研究了纳米微粒Cu,Al,Al2O3及几组混合粒子加入到通用锂基脂中的摩擦学性能.采用扫描电子显微镜(SEM)和能量色散谱仪(EDS)分析了摩擦表面的形貌和元素组成.结果表明:含有纳米Cu,Al,Al2O3及混合粒子的润滑脂对摩擦表面均有很好的减摩、修复及抗胶合能力,其中混合粒子要比单粒子具有更好的效果.通过对实验结果的分析,纳米粒子的微滚珠、吸附、填充、焊合、软剪切层等效应是改善润滑脂摩擦学性能的主要原因,适当配比的混合粒子具有良好的协同效果.     

尼龙66粉末与纳米Fe3O4粒子作润滑油添加剂的摩擦学匹配性研究

利用化学共沉淀法制备了油酸修饰的粒径大小为8nm左右的Fe3O4纳米粒子，并将其与尼龙66粉末混合作润滑油添加剂进行摩擦学试验。试验结果表明在添加纳米Fe3O4粒子的润滑油中再添加适量的尼龙66粉未，润滑油的摩擦学性能得到改善，在保持润滑油润滑性能不变的情况下，磨损量明显降低。可见，纳米Fe3O4粒子与尼龙66粉末表现出了良好的摩擦学协同性能。     

纳米金刚石微粒对宽温航空润滑脂摩擦学特性的影响

研究了7014宽温航空润滑脂中添加一定比例纳米金刚石微粒后的摩擦学特性，并分析了纳米金刚石粉微粒在航空润滑脂中的减摩耐磨机理。     

几种纳米粒子作为润滑脂修复添加剂的试验研究

在MRH-3高速环块摩擦磨损实验机上,研究了纳米微粒Cu,Al,Al2O3,MgO加入到通用锂基脂中的摩擦学性能。并采用扫描电子显微镜,能量色散谱仪分析了摩擦表面的形貌和元素组成。结果表明:含有纳米Cu,Al,Al2O3,MgO粒子的润滑脂对摩擦表面均有很好的减摩和修复能力,但各种粒子的效果有所不同,其中Al2O3,Cu,Al3种粒子要比MgO具有更好的效果。     

The Preparation and Tribological Investigation of Ni–P Amorphous Alloy Nanoparticles

Amorphous Ni–P alloy nanoparticles were synthesized by chemical reduction of nickel acetate in water reacted with sodium hypophosphite under stirring. The nanoparticles were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Results of XRD and TEM showed that nanoparticles have an average diameter 100 nm. And XPS analysis indicated that part of the surface of Ni–P amorphous alloy nanoparticles was oxidized. The tribological properties of the prepared Ni–P nanoparticles as an additive in lithium grease were evaluated with a four-ball friction and wear tester. The worn surfaces of the lubricated GCr15 steel were analyzed by means of XPS and scanning electron microscopy (SEM). The lubricating mechanisms were discussed on the basis of XPS and SEM analyses of the worn steel surfaces. The results show that these nanoparticles as a grease additive can effectively enhance the friction-reduction and antiwear ability of lithium grease. Tribochemical reactions were involved for steel–steel frictional pair lubricated with the lithium grease containing amorphous Ni–P alloy nanoparticles, with the formation of a boundary lubricating and protecting film composed of additives of lithium grease and tribochemical reaction products (iron phosphate, iron oxides, nickel oxide, nickel, etc.) of the lubricants. This contributes to improve the tribological properties of the lithium grease.     

石墨烯作为轧钢机轴承润滑脂添加剂的研究*

为改善轧钢机轴承用润滑脂的性能,采用不同质量分数的石墨烯对润滑脂进行了改性,测定各润滑脂样品的锥入度和滴点,使用四球摩擦试验机研究石墨烯对润滑脂摩擦学性能的影响,使用扫描电子显微镜、白光干涉仪和拉曼光谱仪等分析石墨烯在润滑脂中的减摩抗磨机制。结果表明:石墨烯作为添加剂能提高润滑脂的滴点和改善润滑脂的极压性能以及减摩抗磨性能。当石墨烯质量分数为0.2%时,对润滑脂极压性能的提升效果最好,表现为烧结负荷和综合磨损值最大,较基础脂分别提高了29.0%和24.0%;当石墨烯质量分数为0.3%时,对润滑脂减摩抗磨性能的提升效果最好,摩擦因数和磨斑直径较基础脂润滑时分别下降了22.4%和13.0%,磨损体积减少了43.0%,且最大无卡咬负荷提高了21.2%。石墨烯在摩擦过程中,吸附在摩擦表面,形成保护薄膜阻止了摩擦副材料的直接接触,减少了磨损,同时提高了润滑脂的承载能力。     

氧化镁/氧化锌导电硅脂的性能研究

氧化镁可以提高摩擦表面摩擦膜的致密性,氧化锌也具有优良的抗氧化、抗磨减摩性能.以不同含量的氧化镁和氧化锌为添加剂,二甲基硅油为基础油,聚四氟乙烯作稠化剂,制备导电润滑硅脂,并分别对硅脂的滴点、体积电阻率和摩擦学性能进行测试.结果 表明:氧化镁和氧化锌添加剂都可以提高硅脂的滴点、导电性,其中氧化锌作为添加剂的硅脂的滴点高...     

The Effect of FeS Solid Lubricant on the Tribological Properties of Bearing Steel under Grease Lubrication

In order to improve the tribological properties of 52100 steel under grease lubrication, FeS solid lubricant was used in two ways. Low-temperature ion-sulfurization technology was utilized to prepare solid lubricant iron sulfide (FeS) films on the surface of 52100 steel, and FeS particles were mixed into the lithium grease as additive. The friction and wear properties were examined systematically on a “ball-on-disc” testing machine. The results showed that the tribological properties of bearing steel under grease lubrication can be improved either by using ion-sulfurization technique or by adding FeS microparticles into the grease. The tribological performance of sulfurized surface lubricated by grease is better than that of a plain surface lubricated by grease containing FeS microparticles at lower load and speed. The plain surface lubricated by the grease containing FeS micropaticles possesses better antiwear property under harsher conditions. The mechanism of the experimental results is discussed in detail.     

Tribological characteristics of bisphenol S bis(diphenyl phosphate) as a high‐performance antiwear additive in lubricating greases at elevated temperature

Bisphenol S bis(diphenyl phosphate) (BSDP) was synthesised and characterised, and its tribological behaviours as additives in polyurea grease and lithium complex grease were evaluated for steel/steel contact at 200 °C. The results indicated that BSDP could dramatically reduce the friction and wear of sliding pairs in the base grease of polyurea, and the tribological performances of BSDP in polyurea grease were significantly superior to the normally used molybdenum disulfide‐based additive package. Furthermore, BSDP in polyurea grease has better tribological behaviour than that in lithium complex grease at a constant load of 100 N. X‐ray photoelectron spectroscopy analysis indicated that boundary lubrication films composed of Fe(OH)O, Fe₂O₃, Fe₃O₄ and FePO₄ compounds containing the P–O bonds and nitride compounds were formed on the worn surface, which resulted in excellent friction reduction and antiwear performance. Copyright © 2016 John Wiley & Sons, Ltd.