共查询到19条相似文献,搜索用时 171 毫秒
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基底材料对NiCrBSiC合金激光熔覆层组织和磨损性能的影响 总被引:3,自引:0,他引:3
采用横流CO2激光在45钢和TC4钛合金表面熔覆NiCrBSiC合金涂层,利用XRD,SEM和TEM分析了激光熔覆层的微观组织,测试了激光熔覆层的硬度和摩擦磨损性能.结果表明,NiCrBSiC合金激光熔覆层的组织和性能与基底材料的种类密切相关.45钢表面激光熔覆层由γ-Ni,Ni3B,Cr7C3和CrB相组成,硬度在HV800~900之间;TC4合金表面激光熔覆层由γ-Ni,Ni3B,TiC和TiB2相组成,硬度在HV900~1100之间.TC4合金表面NiCrBSiC激光熔覆层的摩擦系数和质量磨损率分别低于45钢表面NiCrBSiC激光熔覆层的摩擦系数和质量磨损率. 相似文献
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Titanium and its alloys are restricted in the field of application. Laser cladding, as a kind of surface modification technique, is employed to fabricate coatings with improved wear resistance, high temperature oxidation resistance and good biocompatibility on titanium and its alloys. Apart from laser cladding process parameters, material selection is vital to obtain the improved properties mentioned above. In this paper, recent developments of different material system are summarized and the developments in laser cladding for functional coatings with high wear resistance, good corrosion and oxidation resistance, and better medical biocompatibility are reviewed. Besides, the existing problems and the corresponding solutions are discussed. Finally, the trend of development in the future is forecasted. 相似文献
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钛合金因具有高的比强度、比刚度,良好的耐蚀性和耐热性等优点,在航空航天、化工、能源等领域广泛应用,但钛合金存在表面硬度低、抗塑性剪切能力较差、不易加工硬化以及表面氧化物保护作用较差等缺陷,使其耐磨性较差,阻碍了其在耐磨损领域的发展。为了提高钛合金自身的耐磨性潜力和扩大其应用领域,本文主要概述了近年来国内外有关钛合金干滑动摩擦磨损领域的研究现状,讨论了影响钛合金摩擦磨损性能的主要因素以及在不同条件下的磨损机理,并对钛合金干滑动摩擦磨损行为的研究进行了展望。 相似文献
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S. Bonß B. Brenner H.-J. Scheibe H. Ziegele 《Materialwissenschaft und Werkstofftechnik》1997,28(11):524-528
Laser gas alloying – manufactoring process for wear resistant layers on titanium alloys Titanium alloys combine very high specific strength with biocompatibility and corrosion resistance. Because of these excellent properties they were frequently used in space travel, aeronautics, chemical industry, medicine and, increasingly, automotive industry. A handicap of titanium alloys is their low wear resistance against abrasive and sliding wear. Additional applications for titanium alloys can be established by increasing their wear resistance High loadable and wear resistant layers on titanium alloys are generated by the new method for laser gas alloying, developed at the Fraunhofer IWS Dresden. The new method overcomes drawbacks of conventional methodes and is a reliable process for industrial application. By a hard amorphous carbon layer (DLC), deposited by Laser-Arc, an additional increase of sliding wear resistance is possible. First we briefly present the methode itself. The enormous increase of wear resistance is proven with the help of diverse wear tests. 相似文献
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新型β钛合金具有良好的耐磨性和力学性能、高抗腐蚀性以及优良的生物相容性,因而在生物医学领域得到了越来越广泛的应用.综述了钛合金的发展阶段及新型超弹性β钛合金的研究发展状况和最新进展,探讨了几种热处理工艺对钛合金超弹性的影响,介绍了几种钛合金表面改性方法,结合我国研究现状提出了新型超弹性β钛合金存在的问题,展望了其研究发展方向. 相似文献
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There is an increasing industrial demand for metal alloys with high wear resistance under severe operating conditions. Ni-based alloys, such as Inconel superalloys, are an excellent option for these applications; however, their use is limited by their high cost. Ni-based coatings deposited onto carbon steel substrates are being developed to achieve desired surface properties with reduced cost. Laser cladding deposition has emerged as an excellent method for processing Ni based coatings. In this work, microstructure, mechanical properties and local wear behaviour have been investigated in response to the addition of Cr3C2 ceramic particles into an Inconel 625 alloy deposited onto a ferritic steel substrate by laser cladding. Using this deposition technique, a homogeneous distribution of Cr3C2 particles was observed in the coating microstructure. The addition of ceramic particles to the starting powder resulted in the formation of hard precipitates in the coating microstructure. The partial dissolution of Cr3C2 particles during the laser cladding process increased the hardness of the Inconel 625 matrix. Depth sensing indentation and scratch tests were performed to study the local wear behaviour and scratch resistance of the cermet matrix compared with the conventional Inconel 625 alloy. Finally, the effect of Cr3C2 on mechanical properties was correlated with the observed microstructure modifications. 相似文献
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激光熔覆技术具有加热速度快、熔覆过程中产生的热影响区小、基体表面温度低等优点,因此能够较好地保证零部件的尺寸精度,近年来发展成广泛应用的表面改性技术。激光熔覆技术对涂层粉末以及基材选择要求不高,因此广泛应用于不同种类基体材料的再制造修复。从铁碳合金材料出发,分别对激光熔覆技术在改善铸铁、碳钢及合金钢材料的力学性能、耐磨性、耐蚀性、抗热疲劳性等方面的应用进展和存在的问题及对策进行了分析,阐明了工艺参数、材料成分以及工件的预热或后处理对制备高质量大熔覆层组织和性能的影响规律,最后指出了激光熔覆技术在目前研究中存在的问题并对其未来发展方向进行了展望。 相似文献
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Wear Protection for Titanium Components The use of titanium and its alloys in the last decades keeps on increasing due to its material‐specific characteristics like high firmness, good corrosion characteristics and very high thermal maximum stress. However nowadays, the use of titanium components in systems where wear resistance is important is limited by titanium’s relatively low wear resistance. Surface wear is in principle a characteristic, conditioned by chemical and physical effects of the elements involved as well as collective stress. The necessity for new systems where good wear resistance and excellent mechanical properties are combined keeps on showing up. Due to titanium’s tendency to react with surrounding media, titanium alloys are difficult to be welded. Embrittlement by admission of hydrogen and oxygen can occur at high temperature processes or even changes on titanium’s microstructure may appear. Brazing techniques, which are actually applied to steel, have been modified and adapted for using them to titanium materials. Here, commercially available braze pastes and hard materials where combined and applied on titanium. 相似文献