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《铸造》2016,(5)
针对采用整层复合的陶瓷增强铁基表层复合材料存在的复合层易开裂、剥落的问题,提出采用局域化增强结构的设计方案,制备了钴基硬质合金局域化增强高铬铸铁铁基表层复合材料,并对复合材料的组织、界面、磨损性能和磨损机理进行了研究。结果表明:该复合材料具有增韧效果较好,裂纹不易扩展,增强区域分布均匀等优点;钴基硬质合金/高铬铸铁复合材料相对耐磨性是基体材料的8.24倍,具有优异的耐磨性。随着磨损阶段的进行,复合材料的磨损率下降更为明显,反映了高硬度硬质合金在磨损后期充分发挥了抗磨作用。磨粒磨损过程中,复合材料组织中硬质合金增强区域凸出于高铬铸铁基体,且其间具有良好的冶金结合界面,因此增强体保护基体材料和基体材料支撑增强体的协同效应使复合材料具有了优越的耐磨性。 相似文献
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用温压烧结工艺成功制备出WC颗粒增强钢基复合材料,对试样进行微观组织分析和两体磨损性能试验.结果表明,经过温压烧结的试样组织致密,碳化钨颗粒分布很均匀,复合材料的磨损性能是高铬铸铁Cr20的1.5倍,是同样制作工艺条件下常压试样的2.8倍. 相似文献
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铁基颗粒复合材料的组织与抗冲蚀性能 总被引:8,自引:2,他引:6
采用产型负压铸造法制备出铁基颗粒复合材料,分析了复合层的微观组织,研究了其显微硬度分布,测定了复合层的抗冲蚀性能。研究结果表明,铁基颗粒复合材料具有较高的硬度,良好的抗冲蚀性能,明显改善了基体材料的性能。 相似文献
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The advancement of modern technology in the areas of aerospace and automotive industries has generated demand for new engineering materials, leading to a rapid development of metal matrix composites (MMCs) [1]. These composites can be tailored to have outstanding mechanical and physical properties such as high specific strength and stiffness, increased wear resistance, enhanced high-temperature performance and better thermal, mechanical fatigue and creep resistance than those of monolithic mat… 相似文献
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By applying electromagnetic field to a system consisting of tungsten wires and grey cast iron melt, the grey cast iron matrix composite reinforced by either in-situ WC particles or the combination of in-situ WC particles and the residual tungsten wire was obtained. By means of differential thermal analysis (DTA), the pouring temperature of iron melt was determined at 1,573 K. The microstructures of the composites were analyzed by using of X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with an energy dispersive spectrum (EDS) and pin-on-disc abrasive wear test. The obtained results indicated that, with the enhancing frequency of electromagnetic field, the amount of in-situ WC particles gradually increases, leading to continuous decrease of the residual tungsten wires. When the electromagnetic field frequency was up to 4 kHz, tungsten wires reacted completely with carbon atoms in grey cast iron melt, forming WC particals. The electromagnetic field appeared to accelerate the elemental diffusion in the melt, to help relatively quick formation of a series of small Fe- W-C ternary zones and to improve the kinetic condition of in-situ WC fabrication. As compared with the composite prepared without the electromagnetic field, the composite fabricated at 4 kHz presented good wear resistance. 相似文献
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围绕颗粒增强金属基复合材料制品的铸造生产,综述了增强体颗粒的选择、提高基体对增强体润湿性方法、增强体分布的控制技术及制品成形工艺等铸造技术问题。 相似文献
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复合颗粒铸渗制备钢基表面复合材料研究 总被引:1,自引:0,他引:1
将WC和Cr-Fe粉末混合并压制成大粒度的复合颗粒,涂覆于铸型型腔中,然后浇注45钢液进行铸渗实验,并对铸渗层的厚度、组成及铸渗机制进行了研究。结果表明,采用复合颗粒铸渗法得到比普通铸渗法更厚的且无缺陷的铸渗复合层,该复合层由熔合层和钎焊层组成。铸渗机制为高温金属液先渗入复合大颗粒间的通道,将颗粒包围,然后渗入复合颗粒中小颗粒的间隙,最后凝固结晶,形成铸渗复合层。 相似文献
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铸造铝基复合材料的凝固过程 总被引:1,自引:0,他引:1
铝基复合材料中,增强体的加入使金属凝固过程的形核、晶体生长、溶质分配和流体流动行为发生改变,特别是不同压力和冷却条件下的非平衡凝固状态下。从而对基体组织的形态、二相析出、溶质偏聚、界面反应性、凝固缺陷等产生重要影响,最终影响复合材料的性能。基于此,综述凝固过程中铝基复合材料组织与性能的作用规律。 相似文献
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