共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
《稀有金属材料与工程》2003,20(2):5-8
介绍了纤维增强TiAl基复合材料在制备、界面和力学性能等方面的研究和进展。指出纤维增强TiAl基复合材料是发挥TiAl基合金潜力的一个重要方面。同时,也讨论了纤维增加TiAl基复合材料所面临的一些问题。 相似文献
5.
6.
颗粒增强钢铁基表面复合材料铸渗技术的研究与发展 总被引:1,自引:0,他引:1
从材料的选择、铸渗工艺、及铸渗应用等方面,介绍了国内外运用铸渗法制备钢铁基表面复合材料的新进展.分析了复合材料中增强相和基体间的相互作用和界面问题.提出了今后研究工作中值得重视的几个问题. 相似文献
7.
铸造混杂增强金属基复合材料研究进展 总被引:5,自引:8,他引:5
对混杂增强金属基复合材料的铸造方法,常见的4种增强体混杂类型,连续纤维/颗粒(晶须),短纤维(晶须)/短纤维,短纤维(晶须)/颗粒,颗粒/颗粒混杂增强金属基复合材料的基础研究现状进行了综述,分析和讨论,指出开发预制体制备方法,制备出增强体混杂均匀的参制体,以及研究增强体的行为交互作用和机理是混杂增强金属基复合材料领域的进一步研究方向。 相似文献
8.
至今对于连续陶瓷纤维增强的金属基复合材料的开发 ,大多侧重于以熔点较低的轻金属铝合金为基体的复合材料 ,其制造工艺主要是熔融法。对于以钛合金和铁合金等高熔点金属为基体的陶瓷纤维增强的复合材料的开发研究极为少见。因为高熔点金属基材料熔液与陶瓷纤维往往发生反应而使纤维特性劣化。因此 ,研究了利用粉末冶金法制取陶瓷连续纤维与铁基合金复合化的技术 ,因为粉末冶金法能够在比合金熔点低得多的温度下固化成形 ,在制造过程中不致于引起纤维特性的劣化。研究用的陶瓷连续纤维是氧化铝纤维 (结晶相为αAl2 O3,纯度 99 5 % ,密度… 相似文献
9.
10.
本文提出了一种多裂纹模型,用此模型可以分析复合材料中的应力集中、界面脱粘、基体屈服及裂纹间交互作用,分析结果表明,在纤维中存在着较高的应力集中,基体屈服及反应层中裂纹密度增加都促进应力集中,而界面脱粘则使应力集中松弛,对于涂SiC涂层的C/Al复合材料,最佳界面结合强度在100-300MPa之间。 相似文献
11.
12.
研究大功率激光器焊接TiB2颗粒增强铝基复合材料时TiB2粒子的演变行为。采用X射线衍射(XRD)、扫描电镜(SEM)及能谱(EDS)分析焊缝内粒子的物相、热力学过程及形貌特征;同时对TiB2和铝基体的界面反应进行讨论。结果表明:当TiB2团簇尺寸大于激光光斑直径时,焊缝中部的TiB2粒子会熔融在一起,较大尺寸的TiB2会发生断裂;当与铝熔体接触后,熔化后的TiB2粒子会与Al发生反应生成Al3Ti和AlB12,并且焊缝中部的界面反应比焊缝边缘的剧烈。 相似文献
13.
研究金属基复合新材料是当代新材料技术领域中的重要内容之一.金属基复合材料具有高比强度、高比模量、较好的耐热性和更低的热膨胀系数等优点,针对金属基复合材料的制备工艺不完善、成本高、难形成大规模的生产等弱点,并结合国内外相关工作的研究状况,从金属基复合材料的分类、性能特点以及制成品的制备技术与应用方面,对其领域内取得的研究... 相似文献
14.
S. Basavarajappa G. Chandramohan 《Journal of Materials Engineering and Performance》2006,15(6):656-660
The dry sliding wear behavior of SiCp and SiCp-graphite-reinforced aluminum alloy composites produced by liquid metallurgy
is studied by means of a pin-on-disc type of wear-test rig. This study evaluates the influence of independent parameters such
as sliding speed (S), applied load (L), and sliding distance (D) on dry sliding wear behavior of composites. A Taguchi design
for the experiments is used to collect the data in a controlled way, and a linear regression model is developed. This article
tries to model dry sliding wear with wear parameters using a statistical approach. The results obtained in this work enable
the influence and significance of various parameters and their interactions to be better understood. It was found that SiCp-Gr
(graphite)-reinforced composites exhibit less volume loss when compared with SiCp-reinforced composites. Sliding speed is
the most significant factor affecting wear behavior followed by L and D. The effect of interactions between the S and the
L is more pronounced in SiCp-Gr composites. 相似文献
15.
16.
按照采用热源和陶瓷增强颗粒的添加方式,对外加颗粒增强表层复合材料的制备方法分类.详细介绍了堆焊、激光熔覆、激光熔射、等离子熔化-注射等颗粒增强表层复合材料的制备方法,并分析了各种制备技术的优缺点.堆焊特点是基体与表层为冶金结合,效率高.激光熔覆可以实现输入的准确控制,冷却速度快,热畸变小.但是堆焊和激光熔覆过程都存在裂纹问题.激光熔射不受基体可焊性限制,可制备颗粒增强相连续分布的表层,避免裂纹的形成.等离子熔化-注射技术与激光熔射技术类似,可以制备出增强相体积分数从0~100%连续变化的梯度复合材料.避免由于增强颗粒分布不均引起的裂纹,实现低投入、低成本运行. 相似文献
17.
The need for new engineering materials with theadvancement of modern technology in the areas ofaerospace, automotive and numerous other industries haslead to a rapid development of metal matrix composites(MMCs) [1]. They can be tailored to have outstandingmechanical and physical properties such as high specificstrength and stiffness, good wear resistance, enhancedhigh-temperature performance, and better thermal andmechanical fatigue and creep-resistance than that ofmonolithic materials. Among… 相似文献
18.
19.
20.
The 1200°C and 1300°C isothermal and cyclic oxidation behavior of Al2O3 continuous fiber (Saphikon)-reinforced/ NiAl composites were studied. Oxidation resulted in formation of Al2O3 external scales in a similar manner as scales formed on monolithic NiAl. The isothermal oxidation of an Al2O3/NiAl composite resulted in oxidation of the matrix along the fiber/matrix interface near the fiber ends. This oxide acted as a wedge between the fiber and matrix, and, under cyclic oxidation conditions, led to further oxidation along the fiber lengths and eventual cracking of the composite. The oxidation behavior of composites in which the Al2O3 fibers were sputter coated with nickel prior to processing was much more severe. This was attributed to open channels around the fibers which formed during processing most likely as a result of the diffusion of the nickel coating into the matrix. 相似文献