共查询到20条相似文献,搜索用时 203 毫秒
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钛及钛合金具有低比重、高比强度、优异的生物相容性以及良好的耐腐蚀性等特点,在航空航天、生物医疗、化工、船舶、汽车等领域极具应用潜力。钛合金粉末注射成形技术(powder injection molding,PIM)提高了材料的利用率,实现了中小型复杂形状钛产品的大批量、低成本制备,显著地推动了钛及钛合金产品的生产及应用。目前关于粉末注射成形钛合金粘结剂体系的相关文献报道十分有限,新型粉末注射成形钛合金粘结剂体系的开发处于停滞不前的状态。本文分析总结了不同粉末注射成形钛合金粘结剂体系的研究现状,并针对目前存在的问题提出改进措施。 相似文献
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B. K. C. Ganesh N. Ramanaih P. V. Chandrasekhar Rao 《Transactions of the Indian Institute of Metals》2012,65(5):425-434
Titanium alloys are extensively used in various fields of engineering, medicine, aerospace, marine due to their excellent mechanical properties. Their usage is more pronounced today in the field of biomedical implants due to superior biocompatibility, corrosive resistance and high strength. However, titanium alloys have poor wear resistance due to high coefficient of friction. Poor abrasive wear resistance results in the formation of wear debris at the implant area causing toxicity, inflammation and pain. Surface treatment of the implant alloy through heat treatment, application of protective coatings and introduction of compressive residual stresses by shotpeening are some of the methods to mitigate wear of the implant alloy. In this work Ti?C6Al?C4V implant alloy is treated under various conditions of heat treatment and shotpeening operations on a pin on disc wear testing machine. Scanning electron micrograph along with energy dispersive spectrometry analysis is done to authenticate the experimental results obtained during the wear testing procedure. 相似文献
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G. Madhusudhan Reddy A. Sambasiva Rao K. Srinivasa Rao 《Transactions of the Indian Institute of Metals》2013,66(3):231-238
Titanium alloys are widely used in aerospace applications due to their properties like high strength to weight ratio, good corrosion and creep resistance. Poor wear resistance of these alloys limits their use in tribological applications. Friction surfacing technique is now recognized as an effective solution to surface engineer the light weight high strength alloys to make them suitable for general engineering applications involving wear and corrosion. The present work pertains to a study on wear resistance of surface coating of boron carbide on Ti–6Al–4V alloy using friction surfacing technique. Coating was formed by placing the boron carbide powder into the holes of predetermined depth on the surface and was characterized by metallography, electron probe micro analysis and dry sliding wear testing. The present study revealed that titanium alloy could be friction surfaced with boron carbide powder. The coating exhibited excellent wear resistance, which is attributed to the formation of strong metallurgical bond with the substrate. In the present work an attempt has also been made to compare the wear behaviour of surface composite layer on titanium alloy with that of conventionally used engineering materials such as mild steel and austenitic stainless steel. Wear data clearly revealed that wear resistance of friction stir surfaced composite layer is better than that of mild steel and stainless steel. This study demonstrated that friction stir surfacing is an effective strategy for the enhancement of wear resistance of titanium alloys. 相似文献
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泡沫钛融合了泡沫结构与金属钛的双重属性,具有出色的力学性能、优异的耐腐蚀性和良好的生物相容性等优点,在航空、航天、海洋工程、生物医学、能源与环保等领域应用前景广阔。基于粉末冶金技术的造孔剂法是目前制备泡沫钛的主流方法,不仅具有操作简单、设备要求低的优点,而且能通过调整造孔剂参数来控制最终制品的结构与性能。本文综述了造孔剂法制备泡沫钛领域的研究现状与进展,通过分析文献、整理数据,讨论了高孔隙率泡沫钛的研究历程和瓶颈问题,指出了泡沫钛孔隙率研究的发展趋势。 相似文献
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弹簧用高强钛合金的研究进展 总被引:1,自引:0,他引:1
β钛合金因综合性能优异(良好的冷热成形性、时效强化效应明显、耐蚀等)成为高强钛弹簧的理想选择。简述了2种弹簧用高强β钛合金Timetal LCB和Ti-B20的研发现状,并指出钛合金大量用作弹簧的关键在于合金性能的提高以及成本的降低。 相似文献
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TC21钛合金是新型的高强韧损伤容限型钛合金,其模锻件为网篮组织,锻后热处理工艺采用双重退火工艺。本研究采用金相法、SEM等方法系统研究了TC21钛合金模锻件的锻后热处理工艺和显微组织演变规律。试验分析了TC21钛合金模锻件锻后第1次退火加热温度、第2次退火加热温度和保温时间等工艺参数条件下的初生α相数量、形状以及网篮组织形貌特征的变化规律,为TC21钛合金模锻件获得高强、高韧和损伤容限优良综合性能奠定基础。 相似文献
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锆基块体非晶合金具有优良的非晶形成能力,可在很小的冷却速率条件下获得.锆基非晶合金具有高强度、超塑性、高弹性、高硬度、高耐磨性和高耐腐蚀性能等,有着广阔的应用前景.总结了锆基非晶合金的形成机制,着重对锆基非晶合金的力学性能、耐腐性能等进行了综述. 相似文献
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钛合金因其所具有的高比强度和耐腐蚀等优异性能而在航空航天、舰船及石油化工等领域得到广泛应用.蠕变性能是其在高温条件下使用的一项重要指标,添加稀土元素被认为是改善钛合金高温蠕变性能行之有效的方法之一.首先介绍了稀土元素在钛合金中的应用概况,总结了稀土对钛合金综合力学性能的影响.重点分析了Nd、Y、Gd、Er、La等稀土元素的含量、添加形式及制备方法等对钛合金蠕变性能的影响规律,总结了稀土元素影响钛合金蠕变性能的微观机理.提出通过研究稀土Sc对钛合金中硅化物析出过程及其分布的影响规律,进而阐明其抗蠕变机理,提高合金蠕变性能,为设计具有更加优异性能的钛合金材料提供基础理论支撑,是稀土改性钛合金的研究方向之一. 相似文献
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钛/钢层合板兼具钛的耐腐蚀性与钢的良好强度和塑性,广泛应用于海洋工程装备、水电站、核电站、核潜艇等领域。为进一步推动对钛/钢层合板的深入研究,促进钛/钢层合板的发展,对近年钛/钢层合板制备方法进行分析。分析发现轧制法作为一种经济、环保的制备方法,将会成为制备钛/钢层合板的主流工艺,因此重点讨论轧制钛/钢工艺参数、界面组织特征、界面结合机理与化合物形成机制。分析制备温度、轧制工艺、化合物种类、退火工艺等因素对钛/钢层合板力学性能的影响,发现变形不协调、温度与脆性化合物始终是影响层合板界面强度提升的重要因素。通过添加中间层可以在一定程度上改善界面成分并提高界面结合强度,而温度过高会导致严重的界面缺陷。因此,钛/钢层合板未来的研究方向与发展前景是通过轧制法制备波纹界面层合板以及将辅助能场引入层合板轧制领域。 相似文献