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非连续增强钛基复合材料由于具有各向同性、比强度高、优良的高温强度、成本较低等特点而受到高度关注。TiC及TiB增强颗粒以其稳定的复合结构、良好的增强效果得到发展,成为非连续增强钛基复合材料的最终优选增强剂。从制备方法、增强体与基体的界面结构及复合材料的性能等方面概述了非连续增强钛基复合材料的最新研究进展。 相似文献
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《稀有金属材料与工程》1994,11(4):8-9
钛基复合材料是当前国际材料科学发展的前沿领域之一.颗粒强化钛基复合材料又因其工艺简单,制造成本低,倍受人们的青睐.然而,由于钛的活性大,几乎与所有的增强剂都发生反应,激烈的界面反应导致复合材料的性能劣化,甚至于不如基材,给钛基复合材料的研究开发造成很大的困难,使其发展非常缓慢. 相似文献
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钛基复合材料中的增强相极大增加了其热加工难度,导致大变形或大尺寸高性能钛基复合材料板材的制备困难。从钛基复合材料板材发展现状出发,围绕其热轧制技术,分析了轧制温度、变形量及轧后热处理工艺对板材微观组织演变和力学性能的影响规律,重点分析了轧制过程和热处理过程增强相与基体组织之间的相互作用。最后指出当前钛基复合材料板材轧制研究存在的不足及未来的发展趋势。 相似文献
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颗粒增强钛基复合材料研究新进展 总被引:1,自引:0,他引:1
颗粒增强钛基复合材料具有高比强度、低密度、高弹性模量等特点,成为钛基复合材料的发展趋势。目前日本的Toyota公司采用粉末冶金技术制备了原位反应生成的TiB颗粒增强钛基复合材料,已在汽车发动机进、排气阀等部件得到应用。美国Dynamet公司开发了颗粒增强钛基复合材料CermeTi系列,利用其好的耐磨性能在军事、汽车、体育、医疗器械方面进行了开发。我国西北有色金属研究院研制出了性能优异的TP-650钛基复合材料,并且上海交通大学等亦在原位反应法方面作出了较好的结果。 相似文献
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高温钛合金和颗粒增强钛基复合材料的研究和发展 总被引:12,自引:0,他引:12
回顾了高温钛合金的研究和发展历程,指出了现代高温钛合金进一步发展需要解决的主要难题;综述了颗料增强钛基复合材料的研究现状,按照基体的选择、增强相的选择和制备工艺3个方面,阐述了颗粒增强钛基复合材料设计中的基本任务;最后对今后的发展趋势进行了展望。 相似文献
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通过控制碳锰当量及采用钢液完全脱氧和均匀化、控轧控冷工艺及按炉号管理等措施,保证了25MnSiⅢ级预应力钢筋的成份、组织和性能(a=410~460MPa, b= 610~670MPa),从而满足了制作预应力海底桩的需要。 相似文献
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Martin Silber Martin Wenzelburger Rainer Gadow 《Surface & coatings technology》2008,202(18):4525-4530
The use of thermal spray processes with subsequent material densification by semi-solid forming can yield advantages for manufacturing of metal matrix composites (MMC) compared to well-established manufacturing methods like spray forming or diffusion bonding. The main challenges of this method lie in well defined process temperatures during material deposition and forming, handling of the material during the processes, microstructure of the semi-finished matrix, and economical efficiency of the process chain.Particulate reinforcement of light metal matrix material is mainly aimed on improvement of mechanical properties at elevated temperatures, e.g. wear behavior, creep resistance, yield and tensile strength. Composite formation for particle reinforced metals (PRM) by thermal spraying with the arc wire system is achieved by simultaneous deposition of matrix and reinforcement by means of cored wires. Unidirectional (UD) fiber reinforced MMC yield highest specific mechanical properties and can be processed by winding of a continuous fiber strand and coating of the fiber layer by arc wire spraying with wires from light alloy matrix material or by plasma spraying with mixed powders. The coating process can be simultaneous to the winding process or in a separate step for prepreg manufacturing with shape and fiber content adapted to the final component geometry and load case. 相似文献
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指出随着经济的不断发展,新的结构设计规范已采用更为合理的结构分析方法,从而使得建筑结构的安全度不断提高。但目前有相当一部分既有建筑,尤其是众多的文物保护建筑,已不能满足现行结构设计规范的要求,必须对其进行结构加固,保证其安全性。笔者通过工程实例,简要介绍了建筑结构加固技术在既有建筑抗震及地基基础加固处理中的应用方法。 相似文献
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分别研究了不同冷却速率和增强相添加量对内生法制备的Cu6Sn5颗粒增强型复合钎料以及Ni颗粒增强复合钎料显微组织的影响,并得出最佳的冷却工艺条件。结果表明:空冷条件(冷却速率为2℃/s)下制备的Cu6Sn5颗粒增强型复合钎料拥有最佳的显微组织形貌特征,其金属间化合物(IMC)尺寸最小,分布最均匀。对于外加法制备的Ni颗粒增强型复合钎料,其内部大尺寸IMC对周边三元共晶组织生长方向产生严重影响。此外,值得注意的是,当Ni质量分数为0.45%时,显微组织中出现了由IMC聚集形成的树叶和雪花形态。当Ni质量分数增加至2.0%时,由于Ni元素在钎料基体中固溶的作用,显微组织中出现了均匀分布的形状和大小不一的黑色斑点。 相似文献
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The surface oxygen-diffusion-permeation behaviors of T based alloys were investigated.MEF4A optical microscopy and HMV-2000 micro-hardness tester were employed to characterize the microstructure and micro-hardness of the oxygen-permeated alloys.The results show that the micro-hardness of Ti based alloys are sharply enhanced by the permeation of oxygen.The microstructure and micro-hardness of oxygen-permeated layer are strongly related to the oxygen-diffusion-permeation techniques.The solid solution of oxygen in α phase can improve the transformation temperature from αphase to βphase and enlarge the region of α phase so as to improve the microhardness of surface layer.Therefore,surface oxygen-diffusion-permeation would be a feasile method to reinforce Ti based alloys based on the solid solution of oxygen in α-Ti.At last,a diffusion-solution model was put forward. 相似文献
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Development of particulate treatments and coatings to reduce SiC degradation by liquid aluminum 总被引:2,自引:0,他引:2
M. Suéry G. L’Espérance B. D. Hong L. Nguyen Thanh F. Bordeaux 《Journal of Materials Engineering and Performance》1993,2(3):365-373
SiC-particulate-reinforced aluminum alloys are potentially attractive materials for structural applications. Among the fabrication
possibilities, the molten metal mixing technique is one of the most promising in terms of cost and production capacity. Degradation
of SiC by chemical reaction with molten aluminum is a problem that could be, at least partially, overcome by treatments or
coatings of the reinforcements. This article describes the various techniques that have been used to coat particles and presents
results ob-tained during remelting of composites. Prior oxidation of particles, oxide coating by sol-gel, or dry mixing techniques
are thus presented. Oxidation of particles and TiO2 coatings slow the degradation of SiC. Analytical electron microscopy was used to characterize the interfacial reactions that
occurred during fabrication and remelting of composites. Possible mechanisms of protection are then presented and discussed. 相似文献
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B. Wielage S. Steinhäuser T. Schnick D. Nickelmann 《Journal of Thermal Spray Technology》1999,8(4):553-558
Friction and wear cause a reduction in quality and properties of materials, especially their surfaces. A wear test is a good
method for estimating the wear of components and their durability. This article discusses some wear test methods and results
of wear tests on thermal spray composite coatings (particle-and fiber-reinforced). 相似文献