共查询到19条相似文献,搜索用时 93 毫秒
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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
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
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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
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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
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
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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
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J. B. Ferguson Benjamin F. Schultz Pradeep K. Rohatgi 《JOM Journal of the Minerals, Metals and Materials Society》2014,66(6):866-871
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
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AbstractOver 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
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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
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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
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Metallurgical modeling of microcrack repairment during welding nonferrous materials: non-equilibrium solidification behavior of weld pool (I) 下载免费PDF全文
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
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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
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Metallurgical modeling of microcrack repairment during welding nonferrous materials: non-equilibrium solidification behavior of weld pool (Ⅰ) 下载免费PDF全文
《中国焊接》2017,(2)
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
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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