共查询到19条相似文献,搜索用时 156 毫秒
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镁及镁合金具有良好的物理和力学性能,是一种极具发展潜力的材料,但镁合金的耐蚀性较差,采用激光表面熔覆技术,可显著提高其表面的耐蚀性。本文综述了镁合金激光表面熔覆技术。并对今后镁合金激光表面熔覆技术的发展作出展望。 相似文献
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作为最轻的金属结构材料之一的镁合金,其较差的耐磨蚀性和低硬度限制了在工业中更为广阔的应用。激光熔覆涂层因具有稀释度小、组织致密、涂层与基体结合好等优点,可显著提高镁合金表面硬度和耐磨蚀性,获得密切关注,然而此方面缺乏系统的综述研究。以镁合金涂层材料的设计原则为出发点,首次从二元合金涂层、复合性增强涂层、非晶态合金涂层、高熵合金涂层、功能梯度涂层以及医用材料涂层6个方面,综述镁合金表面激光熔覆涂层材料设计体系,并分析每种涂层材料体系的性能特点。对镁合金在激光熔覆领域应用亟待解决的问题及未来发展方向进行展望,提出未来应结合超声振动技术、电磁搅拌技术、高频微锻造技术和等离子喷涂技术等辅助技术,协同高通量材料计算模拟,开发用于镁合金激光熔覆的新型高性能合金,为镁合金表面激光熔覆的涂层设计提供参考。 相似文献
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《机械制造文摘:焊接分册》2008,(3):43-47
熔覆材料对铝合金激光熔覆性能的影响;镁合金表面冷喷涂铝合金的界面扩散行为;TiCCo.3No.7)/铁基复合耐磨熔覆层激光熔覆;汽缸缸套激光重熔处理工艺研究;表面纳米化焊接接头组织和结构; 相似文献
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Laser Surface Engineering of Magnesium Alloys: A Review 总被引:1,自引:0,他引:1
Ashish Singh Sandip P. Harimkar 《JOM Journal of the Minerals, Metals and Materials Society》2012,64(6):716-733
Magnesium (Mg) and its alloys are well known for their high specific strength and low density. However, widespread applications of Mg alloys in structural components are impeded by their insufficient wear and corrosion resistance. Various surface engineering approaches, including electrochemical processes (plating, conversion coatings, hydriding, and anodizing), gas-phase deposition (thermal spray, chemical vapor deposition, physical vapor deposition, diamond-like coatings, diffusion coatings, and ion implantation), and organic polymer coatings (painting and powder coating), have been used to improve the surface properties of Mg and its alloys. Recently, laser surface engineering approaches are attracting significant attention because of the wide range of possibilities in achieving the desired microstructural and compositional modifications through a range of laser?Cmaterial interactions (surface melting, shock peening, and ablation). This article presents a review of various laser surface engineering approaches such as laser surface melting, laser surface alloying, laser surface cladding, laser composite surfacing, and laser shock peening used for surface modification of Mg alloys. The laser?Cmaterial interactions, microstructural/compositional changes, and properties development (mostly corrosion and wear resistance) accompanied with each of these approaches are reviewed. 相似文献
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Laser cladding is a new surface modification technology,and is widely used for fabricating wear and corrosion resistant composites coatings. Self-fluxing alloys have many advantages,such as excellent properties of deoxidizing and slagging,high wear resistance,low melting point and easy cladding,and are often used in laser cladding to improve wear and corrosion resistance of titanium and its alloys. In this paper,the recent development of Ni-based and Co-based self-fluxing alloy coatings which includes the influence of rare earth and ceramic particles in coatings are summarized. Besides,the effects of processing parameters,such as laser power and scanning speed,on coatings are reviewed. Finally,the trend of development in the future is forecasted. 相似文献
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镁合金表面耐蚀改性技术 总被引:12,自引:0,他引:12
镁及镁合金是一种极具发展潜力的轻质结构材料,但镁合金的耐蚀性较差,因此进行适当的表面处理以提高镁合金的耐蚀性能已成为目前研究的热点。微弧氧化、激光表面处理、离子注入、物理气相沉积(PVD)及等离子体注入沉积(IBAD)是近年来兴起的镁合金表面耐蚀强化新技术,这几种技术在处理镁合金耐蚀性方面已取得了一定的成果。综述了目前国内外应用这几种方法提高镁合金耐蚀性方面的研究现状,并展望了其应用前景。 相似文献
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激光熔覆技术具有高的冷却速度、低的稀释率、涂层与基体冶金结合等优点,采用激光熔覆技术制备耐磨性和耐腐蚀好的高熵合金涂层是近几年高熵合金领域的研究热点之一。首先概括了激光熔覆技术制备的高熵合金体系及组织结构特征,大多高熵合金涂层以固溶相为主,少数合金涂层形成了非晶相,与熔炼制备高熵合金块体材料相比,涂层组织具有均匀、细小致密等特点。然后介绍了涂层的性能特征,涂层具有较高的硬度、良好的耐磨性,同时指明高耐磨性涂层不仅具有高的硬度,同时还需要具有一定的塑韧性。涂层合金中大多包含有Al、Cr、Si和Co等形成稳定氧化膜的元素,呈现优异的抗腐蚀性能。随后重点概述了合金元素(Al、Mo、V、Ti、B、Ni、Nb和Cu等)、熔覆工艺参数(激光功率、扫描速度和预制层粉末厚度)和热处理工艺对涂层组织结构和性能的影响规律。其中,熔覆工艺参数对涂层组织结构和性能的影响研究相对较少,将是未来研究的重点内容之一。最后对激光熔覆技术制备高熵合金涂层存在的问题和未来的研究方向做了展望。 相似文献
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Kirsten Bobzin Nils Kopp Thomas Warda Christiane Schulz Gesa Rolink Andreas Weisheit 《Journal of Thermal Spray Technology》2013,22(2-3):207-212
Magnesium and magnesium alloys are the lightest structural materials with an approximate density of 1.7 g/cm2 (density of aluminum ~2.7 g/cm2). Due to poor corrosion and wear resistance properties, they need to be coated for usage in service conditions under corrosive and tribological loads. AlSi20 was found to be a suitable coating material to improve the wear and corrosion protection properties of magnesium alloys. Within this work, AlSi20 coatings were applied by plasma spraying, laser cladding, and a combination of both processes. First, the coatings are characterized by their microhardness and residual stresses formed within the coating during the different coating processes. Then, these coatings were investigated regarding corrosion resistance in 3.5% sodium chloride solution in a three-electrode setup to obtain electrochemical corrosion characteristics. Abrasive wear was investigated using a pin-on-disk tribometer and the abrasion rate was calculated. Resistance against shock loads was tested by applying a cyclic load at 50 Hz to investigate the resistance against impact stresses. 相似文献
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高熵合金(HEA)是目前材料和工程科学领域的研究热点。HEA不同于传统合金,由多种主要元素组成,因此HEA成分数量可能大大超过传统合金。HEA因其独特“近/等摩尔比”的成分构成,具备高硬度、抗氧化、抗腐蚀、耐高温、耐磨等优异的性能。增材制造(AM)与HEA结合可制备出高强度、高塑性、高度复杂几何体的金属零件。本文探讨了目前广泛使用的选区电子束熔化技术(SEBM)、选区激光熔化技术(SLM)、激光熔覆技术(LC)以及等离子熔覆技术(PC)。前两者用于制备块状HEA,后两者用于制备涂层HEA。SEBM制备的HEA延展性好,不易开裂;SLM制备的HEA成形精度、强度、表面光洁度高;LC制备的HEA熔覆层稀释度极低,组织致密;PC制备的HEA熔覆层几乎无气孔、无裂纹。本文系统总结了4种不同AM方法的技术特点,以及制备的HEA相较于传统铸造技术在微观结构特征、力学和耐腐蚀性能方面的优势,并详细介绍其内在机理。本文为开发AM制备高熵合金的前沿技术提供理论思路。 相似文献
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CHEN Chang-jun WANG Mao-cai WANG Dong-sheng State Key Labatoryfor Corrosion Protection Institute of Metal Research Chinese Academy of Sciences Shenyang P.R.China 《材料热处理学报》2004,25(5)
MG and its alloys are widely used in aerospace andautomotive in industry.Its poor corrosion resistancerestricts application of Mg alloy.Laser cladding andlaser surface melting are advantageous processes forimprovement of the corrosion resistance of themagnesium alloy[1-2].In the present study,lasercladding of an Al-11.7Wt%Si alloy with two differentthickness on ZM5die cast alloy was performed withCC>2laser with different powder thickness.1.Experimental ProcedureDie cast plates of ZM5Mg a… 相似文献