含超细颗粒固液二相流对PSZ陶瓷与钢摩擦磨损特性的影响

在往复式摩擦磨损试验机上研究了含超细颗粒固液二相流对部分稳定二氧化锆（ＰＳＺ）陶瓷与ＧＣｒ１５钢滑劝副的摩擦磨损性能的影响。选择９０＾＃机械油和ＱＣ３０汽机油为基础油,分别加入五种超细固体颗粒,配制出不同浓度的２０种油样,分别在１６０１７０和１００℃温度下进行试验。结果表明：超细固体颗粒添加剂的用量、试验温度和基础油都影响陶与钢滑动副的摩擦磨损性能。对超细颗粒添加剂的润滑机理进行了初步探讨。     

钢／钢,工程陶瓷／钢系统的摩擦,磨损和润滑的研究

采用Ｔｉｍｋｅｎ摩擦试验机在空气、水及润滑剂中，对钢、热等静压烧结氮化硅（ＨＩＰ－Ｓｅ３Ｎ４）及掺硼碳化硅（ＳｉＣ－Ｂ）陶瓷材料的摩擦机理进行了研究。试验中，对各种参数，包括速度、滑动距离和各种润滑剂进行了比较。     

外部因素对工程陶瓷材料摩擦磨损特性影响的研究

除材料本身特性外,外部因素如载荷、滑动速度、滑行距离、温度、环境以及摩擦方式等因素同样影响材料的摩擦磨损特性。本文探讨了外部因素对结构陶瓷摩擦磨损的影响,旨在促进在特定工况下正确使用相应的陶瓷材料作为摩擦学部件。     

玻璃陶瓷与高速钢表面摩擦磨损的试验研究

在盘销式摩擦磨损试验机上考察了氟金云母玻璃陶瓷与高速钢的摩擦磨损性能,在不同载荷条件下,测试了摩擦因数和玻璃陶瓷的磨损率,用金相显微镜观察和分析磨损表面形貌,并探讨了玻璃陶瓷材料的磨损机理.结果表明:在低载荷条件下,摩擦因数较低;随着载荷的增加,摩擦因数逐渐增加且趋于稳定,氟金云母玻璃陶瓷与高速钢的平均摩擦因数为0.088;玻璃陶瓷和高速钢的磨损率存在波动;玻璃陶瓷和高速钢的对磨过程以磨料磨损为主.     

碳化硅陶瓷摩擦磨损性能及摩擦过程中接触应力分析

采用MMW-1A多功能立式摩擦磨损试验机,以全因子设计的方法研究干摩擦条件下,载荷和转速两因素对摩擦因数与磨损量的影响。摩擦因数与磨损量的方差分析结果表明,转速对摩擦因数的影响更为显著,而载荷对Si C磨损量的影响更为显著。结合ABAQUS有限元分析软件对Si C陶瓷与45#钢的摩擦过程进行模拟仿真,得到摩擦过程中接触区域的应力分布,同时还探讨Si C陶瓷的磨损机制。结果表明:Si C陶瓷表面的最大等效应力位于接触区边缘,最大拉应力位于滑动前方,最大压应力位于滑动后方;不同应力下Si C陶瓷表面的磨损机制也不一样,主要表现为黏着磨损、磨粒磨损、犁沟磨损。     

不同环境介质下氧化铝陶瓷与耐蚀金属摩擦磨损行为

为优选海水淡化高压泵关键零部件耐磨性能材料,以Al_2O_3陶瓷与TC4钛合金、316不锈钢、2205双相不锈钢组成的配对摩擦副作为研究对象,利用立式万能摩擦磨损试验机开展干摩擦、纯水及海水3种环境介质下配对材料的摩擦磨损试验,定量得到各摩擦副摩擦因数、磨损量,并对摩擦试样的表面形貌进行分析;采用正交试验法分析载荷、转速、环境介质对摩擦因数和磨损量的影响规律。结果表明:在相同的条件下,TC4钛合金与陶瓷配副摩擦因数较小,2205双相不锈钢与陶瓷配副磨损量较小;环境介质对摩擦因数影响较大,载荷对磨损量的影响较大;海水环境下2205双相不锈钢和316不锈钢磨痕较浅,磨损机制为疲劳磨损、磨粒磨损和腐蚀磨损的交互作用。     

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。     

ZTC磨损自补偿添加剂的修复效应

研究了摩擦行程对磨损自补偿性能的影响,试验证实,摩擦副可形成负磨损,ZTC添加剂具有修功能。     

表面氮化对活塞环摩擦磨损参数的影响分析

用摩擦磨损试验机对铸铁活塞环在氮化前后与高硼铜铸铁缸套配合分别进行了半小时和一小时摩擦磨损试验,测量了氮化前后的活塞环表面摩擦系数和磨损量、磨损率,并对磨痕进行了分析。结果表明:未氮化活塞环摩擦系数大于氮化环,摩擦系数变化稳定性比氮化活塞环差,未氮化环磨损量较氮化环增大了约39.6%(半小时)及51.0%(一小时),未氮化环磨损率的一小时试验比半小时试验平均升高6.7%,氮化环磨损率降低了13.7%,与未氮化环配合的缸套磨损量较与氮化环配合的缸套的磨损量和磨损率与活塞环比较规律一致,表面磨痕显示未氮化环磨损剧烈,由此氮化处理提高活塞环-缸套摩擦副的稳定性,且耐磨性得到提高。     

Friction and Wear Behavior of Zinc Dialkyldithiophosphate Additive

A method has been developed for monitoring the film-forming properties of antiwear additives in rolling-sliding, lubricated contacts. This makes it possible to study both the kinetics of reaction film growth and also the evolution of the film morphology as a function of rubbing time. The technique has been applied to investigate the behavior of a zinc dialkyl-dithiophosphate (ZDDP) additive solution and to correlate this with simultaneous friction and wear measurements.

The results show that ZDDP forms a thick, solid-like, reaction film in the rubbing tracks, with negligible film growth outside of the track. This film is extremely effective in preventing metal-metal contact. However the film is unevenly-distributed, with its roughness oriented in the direction of sliding. This directional roughness inhibits the entrainment of fluid film in the mixed lubrication regime, increases the proportion of load supported by solid-solid contact and consequently results in the high friction often associated with the use of ZDDP additives.     

纳米坡缕石的分散工艺对润滑油摩擦性能的影响

研究了纳米坡缕石的分散工艺对润滑油摩擦性能的影响。结果表明,三种分散工艺均可将纳米坡缕石均匀分散到基础油中。在室温下放置24h后,方案二和方案三出现少量沉淀,方案一无沉淀出现。在摩擦试验条件下,三种方案对应的平均摩擦系数分别为0.06518、0.06688、0.07011。     

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。     

The Friction and Wear Model of Steels and Their Probable Statistic Calculations

Based on a systematic analysis of steel wear surfaces by Scanning Electron Microscopy (SEM) and Auger Electron Microscopy (AES), a statistical model for friction and wear of steels is proposed. Three categories of contact are proposed; oxide-oxide, metal-metal, and metal-oxide. Each category of contact is related to a probability distribution on the real contact area. Using a new concept of nascently exposed metallic surfaces, this paper derived the mathematical expressions for the friction coefficient and wear rate by means of statistical methods. The calculated values are in good agreement with measured values.     

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.     

Effect of Metallic-Coating Properties on the Tribology of Coated and Oil-Lubricated Ceramics

Friction and wear behavior was determined for zirconia ceramics lubricated with solid coatings (Ag, Au, and Nb) deposited by ion-beam-assisted-deposition (IBAD) techniques, and a polyol-ester-based synthetic oil. Although the use of soft Ag and Au coatings as solid lubricants in conjunction with the synthetic oil significantly reduced the fiction and wear under boundary lubrication at temperatures up to 250°C, these films had poor durability. In contrast, the Nb coating was more durable in terms of chemical reactivity and adhesion during the tribo-tests than were the Ag or Au films. However, the friction and wear behavior of the Nb-coated zirconia was poorer than that of the ceramics coated with Ag or Au.