水轮机抗磨环的摩擦磨损性能研究

利用ＭＭ－２００型摩擦磨损试验机，研究了木纤维素浸渍树脂在水润滑条件下与不锈钢对摩时的摩擦学特性，同时还利用扫描电子显微镜，对试样磨损表面进行了显微观察与分析。结果表明，木纤维素浸渍树脂与不锈钢对摩时在水润滑和干摩擦环境下的摩擦系数分别为０．２４和０．５３，磨损率分别为２．７２×１０－６　ｍｍ３／（Ｎ．ｍ）和９．２７×１０－５ｍｍ３（Ｎ．ｍ）。在水润滑条件下，木纤维素的磨损机理有犁沟切削和机械微切削；在干摩擦条件下，树脂由于摩擦温升发生热分解，发生粘着磨损。     

三种机械密封材料的摩擦磨损性能研究

研究了3种核主泵用机械密封陶瓷材料(氮化硅、氧化铝和碳化硅)在室温干摩擦条件下及水润滑条件下分别与氮化硅陶瓷球对磨的摩擦磨损性能。研究结果表明,在与氮化硅球干摩擦的3种材料中氧化铝陶瓷具有最大的摩擦系数和最小的磨损质量,氮化硅具有最小的摩擦系数。在氮化硅陶瓷自配对摩擦副摩擦磨损试验中,水润滑条件下氮化硅摩擦系数及摩擦质量损失都有很大程度的减小,且摩擦系数随转速增加而减小。综合考虑力学性能和摩擦磨损性能,选择氮化硅陶瓷作为核主泵机械密封材料更合适。     

润滑状况下Al2O3基陶瓷材料摩擦磨损性能的研究

着重研究了Ａｌ２Ｏ３基陶瓷在滴油润滑条件下的摩擦磨损特性，研究了不同载荷下Ａｌ２Ｏ３基陶瓷的摩擦磨损特性曲线，观察分析了Ａｌ２Ｏ３基陶瓷磨痕形貌及微区化学成份和磨屑的物相组成，并就轻、重载荷下Ａｌ２Ｏ３基陶瓷在不同磨损时期的磨换机理进行了探讨。结果表明；滴油润滑条件下，Ａｌ２Ｏ３基陶瓷的体积磨损量显著降低，但轻，重载荷下摩擦磨损曲线呈现不同规律，轻载荷下以疲劳磨损为主，曲线稳定上升，磨损量小，重载     

石墨改性热塑性聚酰亚胺复合材料的摩擦磨损性能

采用热压成型工艺制备石墨填充热塑性聚酰亚胺复合材料,考察了复合材料的力学性能及干摩擦和三种油润滑条件下的摩擦磨损性能;利用扫描电子显微镜和能谱仪观察分析材料磨损表面形貌和元素分布.结果表明:石墨的加入降低了复合材料的弯曲强度和拉伸强度,干摩擦条件下复合材料摩擦系数随着石墨含量的增大稳步降低最终保持在0.1左右;石墨含量为30%时复合材料磨损率仅为纯树脂的2.9%;油润滑条件下复合材料的摩擦系数相比干摩擦降低了一个数量级;三种润滑油均能在偶件表面形成稳定吸附膜,由于润滑油性质的差异导致材料摩擦磨损性能有所不同.     

镁合金摩擦磨损性能的研究进展

主要综述了近年来镁合金摩擦磨损的研究现状,分析并对比了不同成分的镁合金的摩擦磨损性能,讨论了不同的磨损机理及其他摩擦磨损现象,总结了载荷、速度和温度等实验条件与摩擦磨损间的关系,以及材料自身因素对镁合金摩擦磨损的影响。     

改性聚酰亚胺摩擦磨损性能的研究

论述了不同含量的聚四氟乙烯对聚酰亚胺(P I)/聚四氟乙烯(PTFE) 复合材料摩擦磨损性能的影响。研究结果表明, PTFE 的加入可有效地改善P I 的摩擦磨损特性, 当PTFE 含量在10～20% 的范围内时, 可明显降低P I 的摩擦系数, 其磨损特性主要表现为磨料摩擦和粘着磨损。在P I中添加不同含量的PTFE 的比较结果为: 当PTFE 含量为20% 时, 复合材料的综合性能最佳。      

C/C复合材料摩擦磨损性能研究

综述了国内外对C/C复合材料摩擦磨损性能的研究现状.指出C/C复合材料的摩擦磨损机理为机械磨损和氧化磨损,在高温下(500℃以上)C/C复合材料的磨损是机械磨损和氧化磨损共同作用的结果,而氧化是磨损的根本原因;影响C/C复合材料摩擦磨损性能的因素有材料本身的因素,如复合材料的热解炭结构、密度、石墨化度、防氧化涂层等,也有实际操作条件的因素如刹车环境、刹车过程中的刹车速度、刹车能量等.提出对不同工艺制备的C/C复合材料的摩擦磨损性能有待于进一步研究.     

铜基复合材料的摩擦磨损性能研究现状

铜基复合材料具有优异的性能及广泛的应用,而随着其应用的愈加广泛,对其摩擦磨损性能的要求也愈加严格。综述了国内外颗粒增强、石墨自润滑、纤维增强和碳纳米管增强铜基复合材料的摩擦磨损性能,并简述了目前铜基复合材料存在的一些问题及展望。     

离子注入尼龙6的摩擦磨损性能

用高能离子注入机对尼龙 6进行N+ 注入改性 ,注入能量为 45 0keV ,剂量分别为 2 .5× 10 15/cm2 和 1.2 5× 10 16/cm2 。以ZrO2 及Si3 N4球为上球样 ,分别与注入尼龙 6下盘样组成摩擦副 ,在销盘摩擦实验机上评价它们在干摩擦条件下的摩擦磨损行为。结果表明 ,N+ 注入提高了尼龙 6的摩擦系数 ,增强了尼龙 6的耐磨性 ,高剂量注入样品的耐磨性高于低剂量注入样品。未注入样品的磨损主要表现为粘着、塑性变形和疲劳 ,注入样品的磨损主要为磨粒磨损和塑性变形     

复合润滑体系对POM树脂摩擦磨损性能的改良效果

探讨了复合润滑体系对ＰＯＭ树脂摩擦磨损性能的改良效果，结果表明，以聚烯烃为主润滑剂的复合润滑体系能有效地改善ＰＯＭ的摩擦磨损性能，其摩擦系数下降为ＰＯＭ的０．６０－０．７０倍，Ｐv值提高为ＰＯＭ的１倍以上，耐磨损性提高了２个数量级，且ＰＯＭ表面的靡损在机理上属于犁切磨损，疲劳磨损所引起的复合破坏过程。     

高导热工程塑料的研究进展

介绍了高导热工程塑料的导热性能、导热机理,并在此基础上探讨了提高塑料导热性能的3种途径,特别是阐述了通过改进高聚物加工工艺及其设备来提高导热性,并展望了导热工程塑料的应用前景.     

纳米SiO2对工程塑料改性的研究进展

对近年来纳米二氧化硅(nano-SiO2)改性聚四氟乙烯、聚酰亚胺、聚酰胺、聚苯硫醚、聚甲基丙烯酸甲酯、聚醚醚酮、线形低密度聚乙烯等工程塑料的研究进展情况进行了综述.指出了纳米SiO2改性工程塑料具有广阔的应用前景,但尚存在许多需进一步深入研究的问题.     

填充改性尼龙1010复合材料的摩擦学研究进展

概述了近年国内外对尼龙1010进行填充改性以提高其摩擦学性能的研究进展,对填料的种类以及填充尼龙1010复合材料性能的研究状况进行了综述.指出了改性尼龙1010复合材料具有广阔的应用前景,但尚存在许多需进一步深入研究的问题.     

特种工程塑料发展现状和进展

叙述了聚酰亚胺、聚砜、聚苯硫醚、聚醚醚酮和聚醚砜等特种工程塑料的发展现状和市场进展。     

Synthesis of ionic liquid functionalized graphene oxides and their tribological property under water lubrication

Ionic liquid functionalized graphene oxides (GOs-IL) were synthesized by the amidation and cation-π stacking, and their tribological property as the water-based lubricant additives was investigated. The GOs-IL exhibited superior friction-reducing and antiwear performance. Specifically, under the same test conditions, the mean friction coefficient and wear volume of 0.02 wt% GOs-IL/base liquid suspension were 57% and 76% lower than that of base liquid. The worn surface analyses revealed that the boundary tribofilm composed of the GOs-IL deposition film and chemical reaction film should formed on the wear scar lubricated by the GOs-IL/base liquid suspension. The proposed lubrication mechanism illustrated that the IL functional groups of GOs-IL improved their absorption and embedded stability on the rubbing surfaces by the electrostatic interactions, and then promoted the formation of the above boundary tribofilm. The tribofilm directly prevented the rubbing surfaces from the immediate contact and hence greatly reduced the friction and wear.     

The wear of aluminium-based journal bearing materials under lubrication

The aluminium-based alloys, nowadays, are developed to be used in high performance engine bearings. In this study, new Al-based bearing alloys, which are produced by metal mould casting, were developed; and tribologic properties of these alloys under lubrication were analyzed experimentally. Four different aluminium alloys were carried out on pin on disc wear tester for that purpose. SAE 1040 steel was used as the disc material in the wear tester. Friction tests were carried out at 0.231–1.036 N/mm² pressures and at 0.6–2.4 m/s sliding speeds. Wear tests were carried out at 1.8 m/s sliding speed and at 70 N normal load. Friction coefficients and weight losses of the samples were determined under various working conditions as a result of the experiments. The morphographies of the worn surfaces were analyzed. Hardness, surface roughness, and surface temperature of the samples were measured. The results showed that the friction and wear behaviors of the alloys have changed according to the sliding conditions. The effects of the elements except aluminium composing alloys on the tribologic properties were analyzed. Al8.5Si3.5Cu alloy has a lower friction coefficient value than other alloys. Al8.5Si3.5Cu and Al15Sn5Cu3Si alloys, on the other hand, have the highest wear resistance. Al15Pb3.7Cu1.5Si1.1Fe alloy is the most worn material; and Al15Pb3.7Cu1.5Si1.1Fe alloy has the highest wear rate. As a result of the evaluations conducted, Al–Sn and Al–Si alloys, which include Si and Sn, can be preferred, among the aluminium alloys that will work under lubrication, as the bearing material.     

Influence of counterface roughness on friction properties of engineering plastics for bearing applications

The study investigates the effects of the roughness of the metal counterface (mirror finished or polished) on the coefficient of dry friction for some of the most common engineering plastics used in current bearing technology. The results show that an optimal roughness for minimum friction is likely to exist for any polymer, and it depends on the bulk properties of the polymer itself. “Soft” plastics characterized by a low modulus of elasticity exhibit better sliding behaviour on very smooth, mirror finished surfaces, whereas for high-modulus plastics lower friction is measured in combination with rougher, polished counterfaces. The influence of the contact pressure and sliding velocity are also investigated and found to depend on the layout of the tribological system.     

微量润滑条件下Si3N4陶瓷 白口铸铁的摩擦学性能研究

采用块 盘式摩擦磨损试验方法,在MG 200摩擦磨损试验机上对Si3N4陶瓷 白口铸铁摩擦副进行了微量润滑条件下的摩擦磨损试验,同时根据试件的SME照片和能谱成分分析了摩擦磨损机理,为陶瓷材料的制备及减少磨损提供理论依据。试验和分析结果表明：微量润滑条件下Si3N4陶瓷的磨损率和摩擦系数要比干摩擦条件下小得多;Si3N4陶瓷的磨损率随载荷的增大而增大,滑动速度对磨损率的影响要小于载荷对其的影响;Si3N4陶瓷 白口铸铁的摩擦系数随速度的增大而减小,载荷的变化对摩擦系数的影响不大;Si3N4陶瓷的磨损是化学磨损、机体物质脱落和磨粒磨损共同作用的结果,其中化学磨损起主导作用。     

Friction and wear of Cr-doped DLC films under different lubrication conditions

In this paper, Cr-doped DLC films with various Cr contents were deposited on stainless steel plates by an ion beam deposition/magnetron sputtering hybrid method and the tribological performance of the samples was evaluated using a ball-on-disk tribometer. It was found that the influence of the Cr content in the Cr-doped DLC films on the friction coefficient when lubricated by PAO, 150SN, PAO + T307, or 150SN + T307 is insignificant while the friction coefficient of the Cr-doped DLC films under PAO + MoDTC or 150SN + MoDTC lubrication can be significantly reduced through the introduction of Cr at an optimum level into DLC films. The wear resistance of the DLC films under PAO, 150SN, PAO + MoDTC, or 150SN + MoDTC lubrication can be improved by the introduction of Cr into DLC films; but Cr doping is unbeneficial to the wear resistance of DLC films lubricated by PAO + T307 or 150SN + T307.     

温度对MoSi2／SiC配对副高温摩擦磨损性能的影响

在XP-5型高温摩擦磨损试验机上考察了MoSi2/SiC配对副在700～1100℃时的高温摩擦磨损性能,并用SEM扫描电镜和X射线衍射仪观察和分析了MOSi2/SiC磨损面的形貌与相组成.结果表明,MoSi2/SiC摩擦副在700～1100℃高温滑动时,摩擦系数随着温度的升高而下降;MoSi2的磨损率先随温度的升高而增加,并于1000℃达到极大值后下降;MoSi2的磨损机理主要表现为粘着、研磨和塑性变形等形式,对摩件SiC则随温度升高呈现出磨损增重现象,其主要磨损机理由700℃时的粘着磨损逐渐转化高温氧化磨损.