共查询到16条相似文献,搜索用时 73 毫秒
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本文通过理论分析提出了一种新的金属基复合材料成形工艺——液相调压浸渗成形法,考察了可调工艺参数对浸渗过程的影响规律。实验表明,升压速度在很大程度上决定着材料的浸渗和凝固过程。采用调压浸渗成形工艺可以在较低的压力及模温下获得复合良好的金属基复合材料。 相似文献
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熔融自发浸渗制备多孔陶瓷复合相变储能材料 总被引:1,自引:0,他引:1
研究了融盐Na2SO4与石英质多孔陶瓷预制体的自发熔融浸渗制备工艺,成功地制备出无机盐/陶瓷基(Na2SO4/SiO2)复合相变储能材料,观察和分析了该材料的物相组成与显微结构特征,对该材料的各项热物理性能和机械性能进行了测量.结果表明:自发熔融浸渗工艺比混合烧结工艺更适合于制备无机盐陶瓷基复合相变储能材料. 相似文献
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挤压铸造短纤维增强金属基复合材料浸渗过程分析 总被引:3,自引:0,他引:3
在分析挤压铸造金属基复合材料浸渗条件的基础上,建立了液态金属在短纤维预制件中的浸渗和压力分布模型,计算结果表明:(1)当外加压力不足以使短纤维预制件产生变形之前,其浸渗距离和浸渍前端的压力分别为:Xf=1-F/1-V'f∫^t0udt和Ps=μu/K'0·1-F/1-V'f∫^t0udt-4Vf0γcosθ/df(1-Vf10)(2)当外加压力使短纤维预制件产生变形之后,其浸渗距离和浸渗前端的压力 相似文献
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通过研究纤维预制体空隙的特生及金属液浸渗填主过程,获得了影响纤维增强金属基复合材料浸渗充填质量的主要因素,并提出了是高性能复合材料的途径。 相似文献
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金属基复合材料 (MMC)的微屈服行为有其特殊性 ,主要表现在基体中的热残余应力水平和位错组态与宏观屈服阶段显著不同 ,因而表现出的力学行为也不同。本文综述了金属基复合材料微屈服行为的宏观表现和微观特性 ,并对其研究发展进行了概述 ,指出了有待深入研究的问题 相似文献
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Analysis of in situ Reaction and Pressureless Infiltration Process in Fabricating TiC/Mg Composites 总被引:2,自引:0,他引:2
Qun DONG Liqing CHEN Mingjiu ZHAO Jing BIInstitute of Metal Research Chinese Academy of Sciences Shenyang China 《材料科学技术学报》2004,20(1):3-7
An innovative processing route, in situ reaction combined with pressureless infiltration, was adopted to fabricate magnesium matrix composites, where the reinforcement TiC formed in situ from elemental Ti and C powders and molten Mg spontaneously infiltrated the preform of Ti and C. The influences of primarily elemental particle sizes, synthesizing temperature, holding time etc on in situ reactive infiltration for Mg-Ti-C system were systematically investigated in order to explore the mechanism of this process. In fabricating TiC/Mg composites, Mg can not only spontaneously infiltrate the preform of reinforcement and thus densify the as fabricated composites as matrix metal, but also it can accelerate the in situ reaction process and lower the synthesizing temperature of Ti and C as well. In situ reaction of Ti and C and Mg infiltration processes are essentially overlapping and interacting during fabrication of TiC/Mg composites. The mechanism proposed in this paper can be used to explain the formation 相似文献
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Based mainly on the work done at the authors'laboratory in recent years,this paper examines whatis currently known about the cyclic deformationand fatigue properties of metal matrix composites,with particular emphasis on discontinuous fiber(whisker or particulate)-reinforced Al composites.The following items are discussed:fatigue strengthand life,cyclic deformation and microstructuralevolution,microcrack initiation and growth,fatiguecrack propagation behaviour. 相似文献
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熔渗法制备颗粒增强铝基复合材料的工艺评述 总被引:3,自引:0,他引:3
本文介绍了合金熔体自浸渗法制备颗粒增强铝基复合材料的工艺原理 ,总结讨论了各种不同类型熔渗工艺的特点 ,分析了存在的问题和工艺研究的思路 相似文献