MoSi2/45#钢在油润滑状态下的摩擦学性能研究

在M - 2 0 0型磨损试验机上进行了金属间化合物MoSi2 / 4 5 # 钢的摩擦磨损试验 ,考察了载荷和润滑状态对MoSi2 材料摩擦磨损性能的影响 ,采用扫描电子显微镜 (SEM)和微探针观察了其磨损形貌 ,并分析了其磨损机理。结果表明 :油润滑明显改善了MoSi2 材料的摩擦学性能。MoSi2 材料的磨损机理在低载荷 (5 0～ 80N)下主要表现为疲劳磨损和磨粒磨损 ,高载荷 (12 0N以上 )下以氧化磨损为主。载荷为 15 0N时 ,MoSi2 材料具有较好的综合摩擦磨损性能 ,摩擦系数和磨损率分别为 0 1和 0 0 0 9g·km-1。     

海水润滑条件下40Cr钢的冲击磨损实验研究

使用冲击磨损试验机、扫描电镜及表面形貌仪研究冲击载荷作用下40Cr钢在海水润滑工况下的表面损伤行为。结果发现,冲击使材料表面发生了塑性变形和磨损,塑性变形存在于冲击的每一阶段;冲击凹坑深度及体积随冲击次数的增加呈增大趋势;相比干接触条件,使用海水润滑可有效抑制冲击磨损,但会对冲击凹坑表面造成一定的腐蚀,并且该腐蚀程度随载荷的增加而增强;相同冲击次数条件下,海水润滑时的冲击凹坑深度和体积大于BS05润滑油润滑时的凹坑深度和体积。     

水润滑橡胶轴承的磨粒磨损特性及机理研究

以含沙量不同的自来水为润滑介质，用MPV-200型摩擦磨损试验机分别研究了含沙量对水润滑丁腈橡胶轴承的摩擦系数和磨损率的影响，得出了丁腈橡胶轴承在不同水质下的磨擦学特征，并对作用机理进行了系统的分析，为水润滑橡胶轴承的实际应用提供理论指导。     

硅油润滑对莫来石基陶瓷摩擦磨损性能的影响研究

莫来石基陶瓷具有一系列优异的性能,其在摩擦学领域中的应用越来越广泛。本文研究了硅油润滑对该类陶瓷摩擦磨损性能的影响规律。研究结果表明,硅油可明显地降低莫来石基陶瓷的摩擦系数和磨损率,但却使摩擦系数在稳定阶段的波动幅度增加。硅油润滑条件下,莫来石基陶瓷的磨损机理主要是微观断裂和磨料磨损。     

不同热处理条件下45#钢与40Cr钢摩擦学性能比较

针对机械行业中45^#钢和40Cr钢使用混乱的状况,着眼于2种钢材的基础性能,从45^#钢和40Cr钢的耐磨性能入手,对二者在不同热处理条件下的摩擦学性能进行了研究和比较。结果表明：在调质处理状态下,45^#钢和40Cr钢与GCr15钢对磨时的摩擦因数基本相同,但45^#钢的磨损量要低于40Cr钢,在强度符合条件,工件形状不太复杂的情况下,建议采用45^#钢;在淬火加低温回火处理状态下,45^#钢的摩擦因数与磨损量均高于40Cr钢的摩擦因数。在强调工件的强度和耐磨性时,建议采用40Cr钢;在高频淬火加低温回火处理和在离子氮化处理状态下,45^#钢的摩擦因数与磨损量均接近于40Cr钢的摩擦因数与磨损量,在保证强度的情况下,可以考虑采用45^#钢以降低生产成本。     

氧气气氛条件下钢铜摩擦副摩擦磨损特性研究

利用MMS-1G销盘式高温高速摩擦磨损试验机,研究了氧气气氛条件下CrN iMo钢/H96黄铜配副的干滑动摩擦磨损特性,并分析了磨损机制,结果表明:纯氧气气氛条件下,摩擦因数随着载荷和速度的增加而减小;磨损率随着载荷和速度的增加而增加。在逐步增加速度与载荷的过程中,存在着摩擦磨损机制的改变。CrN iMo钢磨损失效机制主要表现为氧化磨损、剥落磨损、粘着磨损和磨粒磨损。     

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。     

水润滑条件下高岭土填充UHMWPE基复合材料的摩擦学特性

分别用釜内聚合和机械混合两种方法制备高岭土填充UHMWPE基复合材料,对其在水润滑条件下的滑动摩擦磨损特性进行了试验研究,并通过对磨损表面形貌的观察分析,对材料的磨损机理进行了探讨.结果发现,水润滑对UHMWPE/Kaolin?5钢摩擦副的减磨(摩)作用显著;填充适量高岭土可以明显提高UHMWPE在水润滑条件下的摩擦磨损性能;釜内聚合方法制备的UHMWPE/Kaolin的磨损率相对较低,具有广阔的应用前景.     

一种新型摩擦材料在水润滑下的摩擦学性能研究

采用环块式摩擦磨损实验研究了一种新型摩擦材料在水润滑状态下不同载荷与转速对试样摩擦学性能的影响,并对比干摩擦条件下的摩擦学性能变化,借助磨损表面形貌观察分析其磨损机理。实验结果表明:水润滑条件下,摩擦系数随着载荷的增大而减小,随着转速的提高先增加后减小;磨损率随着载荷与转速的提高都减小。相同载荷与转速下,干摩擦时磨损机理以磨粒磨损和黏着磨损为主,而水润滑条件下水形成边界润滑,磨损机理以磨粒磨损和轻微的黏着磨损为主;水润滑条件下摩擦系数和磨损率均低于干摩擦,主要是由于水起到了润滑和冷却的作用,阻止了转移膜的形成,并在材料表面形成水膜起到了边界润滑的作用。     

表面织构在脂润滑条件下的摩擦性能研究

采用声光调Q二极管泵浦Nd:YAG激光加工系统在H13钢表面加工出不同密度的织构,以润滑脂作为润滑剂,利用MMW-1A型微机控制万能摩擦磨损试验机考察表面织构在不同载荷、不同转速条件下的摩擦磨损特性。实验结果表明:在脂润滑条件下表面织构能有效改善摩擦副表面的摩擦性能;与光滑无织构试样相比,表面织构试样的摩擦因数显著降低;一定范围内,随着织构密度的增加,平均摩擦因数呈现出先减小后增大的趋势,且织构密度为10%时的平均摩擦因数最小,最小平均摩擦因数为0.18,较光滑无织构试样减小32.23%;摩擦因数随着试验载荷的增大而减小,但随着转速的增加呈现出先减小后增大的变化趋势。     

不同润滑条件下HIP-Si3N4/GCr15摩擦副摩擦特性的研究

在干摩擦、水润滑、锂基脂润滑和锂基脂＋MoS2润滑不同条件下,利用MPX-2000型盘销式摩擦磨损试验机,对HIP－Si3N4/GCr15摩擦副进行了摩擦磨损性能的对比试验研究,通过扫描电子显微镜对试件的表面形貌进行观察分析。结果表明:磨损速率的表现,Si3N4为水润滑＞干摩擦＞锂基脂润滑＞锂基脂＋MoS2润滑;GCr15为干摩擦＞水润滑＞锂基脂润滑＞锂基脂＋MoS2润滑。在锂基脂＋MoS2润滑条件下,HIP－Si3N4/GCr15摩擦副摩擦特性最佳。     

混合型轴承摩擦机理的研究

采用Timken摩擦试验机在空气中,水、润滑油及合成油脂润滑状态下对M50钢、热静等压氮化硅陶瓷轴承元件的摩擦机理进行了研究.对各种参数包括速度、滑动距离和润滑剂进行了比较.     

外加电压对边界润滑下钢/铜摩擦副摩擦磨损的影响

利用球盘式摩擦试验机，针对150SN油润滑下的GCr15/ZCu10Fe3摩擦副，研究了不同极性的外加直流电压对其摩擦系数和磨损状态的影响，并结合磨痕的能谱分析，探讨了外加电压对其摩擦磨损性能的作用机理。     

Synergetic Effect of Lubricant Additive and Reinforcement Additive on the Tribological Behaviors of PEEK-Based Composites under Seawater Lubrication

Polyetheretherketone (PEEK)-based composites reinforced with lubricant additive (polytetrafluoroethylene, PTFE) and reinforcement additives including carbon fiber (CF), glass fiber (GF), and bronze powder were prepared using a hot-press molding technique. The synergetic effects of different additives on the tribological behaviors of PEEK-based composites sliding against 316 steel under seawater lubrication were investigated systematically using a ring-on-block test rig. The results showed that lubricant additive PTFE can decrease the friction coefficient and consequently improved the wear resistance of PEEK under seawater lubrication, especially when the volume fraction of PTFE was about 20%. It was also found that the incorporation of CF can further improve the wear resistance of PEEK blended with 20% PTFE, especially under high load and high sliding speed. This suggested that a synergistic effect on improving the wear resistance of PEEK existed between PTFE and CF, which originated from good lubrication of PTFE, good reinforcement of CF, and good interfacial combination between CF and PEEK-20%PTFE. However, two other reinforcement additives of GF and bronze powder had an antagonistic effect but not a synergetic effect with PTFE; that is, the incorporation of the two additives greatly deteriorated the wear resistance of PEEK blended with 20% PTFE.     

八纵向沟水润滑橡胶轴承润滑性能研究

水润滑橡胶轴承是水下最适宜的轴承之一,笔对潜水泵上常用的八纵向沟水润滑橡胶轴承,在水润滑条件下的润滑机理进行了实验研究,根据实验结果剖析了影响摩擦系数的主要因素及其影响规律,并据此提出了一组实用设计参数。     

Silicon Nitride Boundary Lubrication: Effect of Oxygenates

A ball-on-three-flat (BTF) wear tester was used to investigate the boundary lubricating characteristics of oxygenates on a commercial silicon nitride. A wide variety of oxygen-containing compounds were tested neat and/or at 1% by weight in a paraffin oil. Compounds containing hydroxyl functional groups were more effective compared to a base case of neat paraffin oil. Decreases of up to 58% in friction coefficient, and 95% in wear were obtained. In most cases, films were observed in and around the wear scar, suggesting chemical reactions had taken place in the contact.

Additional wear tests, conducted using neat shorter-chain linear primary alcohols, i.e., 6–10 carbons, demonstrated boundary lubrication protection, with longer chain length providing better antiwear performance. A study of several C₈ compounds with specific oxygen-containing functional groups (primary alcohol, secondary alcohols, acid, aldehyde, and ketone) demonstrated that the primary alcohol had the strongest boundary lubricating effect. Varying the amount of water in the alcohols had little effect on friction and wear, suggesting that the boundary lubrication effects observed were not merely due to dissolved water in these fluids, but some characteristic chemical interaction with the hydroxyl functional group of the alcohols and acids.     

Silicon Nitride Boundary Lubrication: Lubrication Mechanism of Alcohols

This paper describes the lubrication mechanism of alcohols with silicon nitride under boundary lubrication conditions. Dynamic wear tests and static chemical reaction studies were conducted to study the chemical interaction between alcohols and silicon nitride. Direct evidence of chemical reactions occurring between alcohols and silicon nitride was collected. Gel-permeation-chromatography-graphite-furnace-atomic-absorption (GPC-GFAA) analysis detected the presence of high molecular weight (HMW), silicon-containing, metallo-organic compounds in the wearing contact. Secondary ion mass spectrometry (SIMS) analysis of the reaction products from wear tests revealed the formation of silicon alkoxides. These alkoxides subsequently reacted to form HMW products which had been independently verified as capable of lubricating silicon nitride surfaces. A two-ball collision test was used to verify the lubricating quality of the film generated from the wear test. A lubrication mechanism is proposed in which alcohols adsorb and react with the oxide/hydroxide layer of Si₃N₄ to produce a bonded surface silicon alkoxide. Subsequent tribochemical reactions prompted by the surface disruption from the wearing contact cause the formation of free silicon alkoxides. These species then proceed to form a variety of silicon-containing high molecular weight products that have demonstrable lubricating ability. This mechanistic understanding provides a framework of Si₃N₄ lubrication.     

高速重载下三种固体润滑膜耐磨性的实验研究

用销盘摩擦实验机研究三种固体润滑涂层;喷涂NF-1、粘结PEF及粘结Teflon-S涂层在高速（5.6m/s）、重载（初始接触应力400MPa)干摩擦条件下的摩擦磨损性能。结果表明：这三种涂都具有接近30min的使用寿命,具有较低的摩擦系数和磨损率,提高了抗咬合能力,基点NF-1和Teflon的摩擦系数从0.08分别增加到0.14和0.15。PEF涂层摩擦系数从0.1降低到0.08。