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1.
磨损部件自修复原理与纳米润滑材料的自修复设计的构思   总被引:5,自引:0,他引:5  
欧忠文  丁培道等 《表面技术》2001,30(6):47-49,53
磨损导致能源浪费和零部件失效,为减少或抑制摩擦磨损,通过润滑油品配方设计和有效利用摩擦产生的物理化学作用,提出了摩擦自适应、摩擦成膜自修复、原位摩擦化学自修复3种自修复原理,并依据自修复原理提出了纳米润滑材料的自修复设计构思。  相似文献   

2.
机械零件摩擦磨损表面自修复研究进展   总被引:2,自引:0,他引:2       下载免费PDF全文
摩擦学的发展已将摩擦磨损的研究从抗磨减摩扩展到磨损表面的自修复甚至是零磨损.文中对摩擦磨损表面自修复的概念进行了阐述,详细论述了自发摩擦磨损自修复和条件摩擦磨损自修复的几种类型和实现模式,指出纳米技术的发展有望在摩擦表面建立起一层自组装的、坚固的、自修复的润滑膜,为摩擦磨损表面自修复提供了切实的途径.  相似文献   

3.
针对目前润滑自修复技术生成的修复层厚度较薄,难以修复较严重磨损表面的不足,研制了含铟、锡和锌三种软金属添加剂的新型磨损自修复润滑剂。在摩擦磨损试验机上,考察了使用该润滑剂的钢?钢面接触摩擦副的磨损自修复行为及其摩擦学性能。用X射线能谱(EDS)和扫描电镜(SEM)分析了修复表面的主要化学元素和自修复涂层的厚度。用淬冷试验测试了涂层与基体的结合强度。结果表明,研制的铟锡锌润滑脂能在钢表面摩擦形成约30μm厚度的自修复涂层,涂层与基体结合性能良好,修复后的钢表面有良好的减摩抗磨性能。  相似文献   

4.
层状硅酸盐自修复材料的摩擦学性能研究   总被引:7,自引:1,他引:6  
采用端面摩擦磨损试验机考察了层状硅酸盐自修复材料的摩擦学性能,利用SEM、EDS和纳米压痕仪对摩擦表面进行了形貌、元素和微观力学性能分析.结果表明,层状硅酸盐自修复材料能够显著降低摩擦副表面粗糙度,改善摩擦副的润滑状态而减少摩擦阻力,可使摩擦因数均值由0.09降低至0.03,并能够在摩擦表面形成一层富含C、O、Si、Al、Mg等元素的高硬度表面改性修复层,有望应用于延长摩擦零部件的使用寿命.  相似文献   

5.
汽车及船用发动机应用金属磨损自修复技术的效果   总被引:1,自引:0,他引:1  
董伟达  马文江  黄岩 《铸造》2005,54(4):401-403
研究了自修复材料保护层的摩擦性能、显微硬度,还研究了在台架和行车试验中自修复材料对发动机的动力性能、节油指标和尾气排放等综合性能指标的影响,并在形成自修复材料保护层的状态下进行了无机油行驶试验.结果表明,自修复材料可对已磨损的零件表面进行不拆卸原位修复,自修复材料保护层具有超低摩擦系数,无油润滑(干摩擦)条件下仅为0.005μ,还可降低20%~50%发动机CO等有害气体的排放,具有显著的技术、经济和社会效益.  相似文献   

6.
金属磨损自修复技术在汽车发动机维修中的应用   总被引:2,自引:0,他引:2  
秦传江  洪奕 《表面技术》2009,38(4):80-82
金属磨损自修复技术是自修复材料通过润滑剂为载体,进入摩擦副工作面,经挤压,在金属摩擦表面生成一层铁基硅酸盐耐磨保护层(金属陶瓷层),从而实现在不拆卸原件的情况下对已磨损的零件表面部位进行自动修复.介绍了金属磨损自修复技术的特点、机理及在汽车发动机维护中的应用方法,通过试验研究了自修复技术对发动机性能的影响及自修复材料保护层的摩擦性能、显微硬度,结果表明具有显著的经济效益.  相似文献   

7.
润滑油纳米TiO2添加剂的摩擦自修复及其性能研究   总被引:3,自引:1,他引:2  
将质量分数为2%的纳米TiO2作为自修复添加剂加入350SN基础油中、采用WMP-1多功能摩擦磨损试验机考察纳米TiO2在面摩擦条件下的自修复行为及摩擦条件对其修复性能影响.结果表明,修复量受载荷、转速和修复时间的影响,在适宜的摩擦条件下,试环出现磨损负增长.表面粗糙度仪、扫描电子显微镜、X-射线能谱仪分析表明纳米TiO2能够改善摩擦副的表面粗糙度,对磨痕起到整平和修复作用,从而对磨损表面起到修复作用.  相似文献   

8.
由黑龙江圣龙金属磨损自修复材料有限公司生产的金属磨损自修复产品,是一项具有革命性的表面工程领域的高新技术,可以在机械设备不解体、不停机工作状态下,自动完成对机械设备中存在的金属摩擦副表面自动强化和修复。在其表面形成金属陶瓷保护层,具有原位恢复零件几何尺寸、提高表面硬度和降低摩擦因数等功能,以达到提高设备的性能、  相似文献   

9.
针对恶劣工作环境会加剧机械设备摩擦副间的磨损而降低其服役寿命的问题,对比研究3种纳米添加剂TiO2、TiN和TiC在不同工况下的摩擦学性能及其自修复性能。根据SH-T0762-2005标准润滑油摩擦因数测定法,并利用MRS-10A型四球磨损试验机磨斑测量光镜、激光共聚焦显微镜和能量色散谱仪(EDS)对磨损表面进行表征,探讨其润滑抗磨及自修复机理。结果表明:钛基纳米添加剂的加入很好地改善了润滑油的抗磨减磨性能,并使其具有一定的自修复性能;当钛基纳米质量分数为0.5%时,其减摩抗磨性能达到最佳。3种纳米添加剂中,对润滑油减摩抗磨性能改善效果最好的是纳米TiO2,而自修复效果最好的则为纳米TiN。故纳米TiN和纳米TiO2作为润滑油添加剂,具有较好的减摩抗磨和自修复能力。  相似文献   

10.
微纳米减摩自修复技术的研究进展及关键问题   总被引:5,自引:0,他引:5  
阐述了徼纳米减摩自修复材料的分类、作用机理及研究现状,提出目前微纳米减摩自修复技术发展中的关键问题是建立准确的自修复评价方法及评价指标;合理解决微纳米颗粒在油性介质中的分散与稳定难题;根据设备的润滑工况选择合适的材料及使用工艺;深入开展自修复机理研究,进而实现磨损尺寸自修复等.  相似文献   

11.
Self-healing in inorganic materials is a relatively new area in materials science and engineering that draws inspiration from biological systems that can self-repair damage. This article reviews the preliminary attempts to impart self-healing behavior to metals. Several challenges yet exist in the development of metallic alloys that can self-repair damage, including surface bonding issues, such as liquid/solid contact angle (wetting) and oxidation, and practical issues, such as capillary pressure for delivery of a liquid metal to a damaged area or crack, and the overall mechanical properties of a composite system. Although the applied research approaches reviewed have obtained marginal success, the development of self-healing metallic systems has the potential to benefit a wide range of industrial applications and thus deserves greater investment in fundamental research.  相似文献   

12.
金属表面无铬替代处理技术的研究进展   总被引:9,自引:6,他引:3       下载免费PDF全文
李红玲  刘双枝 《表面技术》2013,42(2):112-115
金属表面铬酸盐转化膜不仅具有优异的耐腐蚀性能,还具有自我修复功能,但是环保的需要使得铬酸盐钝化工艺将逐渐被各种无铬钝化无毒技术所替代。介绍了硅酸盐、钼酸盐、稀土复合转化膜、有机硅烷等各种无铬钝化工艺的优缺点和发展现状。并指出了今后金属表面处理无铬无毒钝化的方向。  相似文献   

13.
Abstract

Over the past decade, three technologies, high throughput studies, multiscale modelling (MSM) and self-repair, have entered the field of corrosion science. MSM links processes from 106 to 10?7 m and allows an understanding of how metal protection systems interact with the environment and with surface electrochemical processes. Potentially MSM has the ability to accurately predict component life and so permit virtual design. In virtual design, a huge range of possible design (including molecular designs) can be assessed on a PC before selecting the best performing inhibitor for a specific application. High throughput experimentation permits many tests to be undertaken at one time. As well as allowing a huge range of inhibitors to be tested under a variety of conditions, it allows the inhibitors of the one family with subtly different molecular configurations to be tested. Self-repair is based on the principle that no matter how well we design and construct a material, it will always develop defects and thus the safest way to design is to build in agents that can cause the material to repair itself. These materials by themselves can hasten our material development and provide more reliable materials; however, if combined synergistically, they will permit radically new materials with tailored functionalities to be developed.  相似文献   

14.
Zinc is protected in the short term by chromate conversion coatings. The Cr (VI) based surface layer has the unique ability to self-repair which is attributable to the aqueous properties of its constituent ions. The thermodynamic feasibility of achieving chromium-like protection for the short term using other candidates is reviewed. Long-term protection of zinc is naturally affected by its own corrosion products (patina), which form a multilayered structure. The role of this patina in protecting the underlying metal is also reviewed, and processes within the patina, including the interaction between its various layers, are elaborated and discussed.  相似文献   

15.
基于动态磁场集群磁流变平面抛光的加工机理以及动态磁场作用机理,对单晶硅基片进行动态磁场集群磁流变抛光试验研究。结果表明:动态磁场能使畸变的抛光垫实时自修复,磨料具有频繁的动态行为,克服了静态磁场作用下抛光垫变形难恢复且磨料堆聚的缺点,使材料去除过程稳定,抛光效果较好;在动态磁场作用下,不同抛光方式的加工效果也不同;在多工件同步抛光中,大尺寸的工具头高速自转使工件表面有更高的线速度,磨料对单晶硅表面缺陷去除作用更强。经过5 h抛光,硅片表面粗糙度Ra由0.48 μm下降到3.3 nm,获得超光滑表面。   相似文献   

16.
Metallurgical modeling of synergistic microcrack self-repairmen during welding single crystal and polycrystalline superalloys of high-temperature aerospace materials has been properly established.The idea of improvement of nickel-based superalloys weldability through non-equilibrium solidification behavior of backfill to self-repair arterial crack network is usefully proposed.Crystallographic control strategy of crack self-repairmen of fusion zone interdendritic solidification cracking and heat-affected zone (HAZ) intergranular liquation cracking is technically achievable,indicating that optimal niobium alloying beneficially refines weld microstructure,stabilizes the primary solidification path,increases the solidification temperature and concomitantly decreases the weld pool geometry.High-carbon grain boundary is more thermal stable and less contributes to incipient intergranular liquid film than that of low-carbon grain boundary.The theoretical predictions of cracking susceptibility are indirectly verified in a rather satisfactory manner.Additionally,the metallurgical modeling enhances predicative capabilities and thereby is readily applicable for other alloy systems.  相似文献   

17.
In this work, the anticorrosion properties of phenyl trimethoxysilane (PTMS) films coated on aluminium 5000 series alloys were studied. PTMS films were deposited at various cathodic potentials. The optimum electrodeposition potential was found to be ?0.8?V vs. SCE. The coatings were also modified by different amounts of nano-TiO2. In order to introduce corrosion inhibition and a self-repair property of the PTMS film, the addition of chromium (III) corrosion inhibitor in the presence of nano-TiO2 was studied. The anticorrosion performance of coatings was investigated in a 3.5 wt.% NaCl solution. At optimum deposition potential, the ‘critical’ nano-TiO2 and Cr(III) contents were both observed, under which the obtained PTMS coatings show the highest anticorrosion performance. The surface morphologies of PTMS coatings were examined by scanning electron microscopy. The results showed that the coatings deposited at ?0.8?V vs. SCE, from 20?ppm of nano-TiO2 and 0.003 M Cr(III) inhibitor present uniform and compact morphologies.  相似文献   

18.
Metallurgical modeling of synergistic microcrack self-repairmen during welding single crystal and polycrystalline superalloys of high-temperature aerospace materials has been properly established. The idea of improvement of nickel-based superalloys weldability through non-equilibrium solidification behavior of backfill to self-repair arterial crack network is usefully proposed. Crystallographic control strategy of crack self-repairmen of fusion zone interdendritic solidification cracking and heat-affected zone( HAZ) intergranular liquation cracking is technically achievable,indicating that optimal niobium alloying beneficially refines weld microstructure,stabilizes the primary solidification path,increases the solidification temperature and concomitantly decreases the weld pool geometry. High-carbon grain boundary is more thermal stable and less contributes to incipient intergranular liquid film than that of low-carbon grain boundary. The theoretical predictions of cracking susceptibility are indirectly verified in a rather satisfactory manner. Additionally, the metallurgical modeling enhances predicative capabilities and thereby is readily applicable for other alloy systems.  相似文献   

19.
One the way to improve the self-repair properties of sol-gel films on aluminium alloy is the addition of corrosion inhibitors which could be released from the coating, minimising the corrosion of the unprotected area. Environmentally friendly corrosion inhibitors are studied (chromium III, molybdate, permanganate and cerium III) and compared to the standard corrosion inhibitor, i.e. hexavalent chromium.Corrosion performances are studied by polarisation resistance (Rp) in chloride medium. Evolution of composition of sol-gel coatings, during the corrosion test, is examined by GDOES (glow discharge optical emission spectroscopy).The results show that the morphology of sol-gel and the solubility of the additive play a role in the effectiveness of corrosion protection for a long term. Additives such as molybdate and permanganate ions decrease the sol-gel network stability and are too soluble (they are rapidly lost from the sol-gel films, in an aggressive medium), decreasing the power to prevent corrosion. Incorporation of Ce III is not efficient for a long time due to its high solubility. Sol-gel films containing Cr VI and Cr III provide adequate corrosion protection, due to the sol-gel stability and their low solubility.  相似文献   

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