共查询到18条相似文献,搜索用时 78 毫秒
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系统而简要地介绍了低成本无压浸渗近净形制备加工高体分SiCp/Al复合材料的新技术.以碳化硅颗粒体分约为45%的复合材料为例,对其基本力学性能、热物理性能及阻尼性能进行了测试.通过对比和分析,揭示了这种技术的优势所在,以及该结构/功能一体化复合材料最具前景的几个应用方向. 相似文献
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Mg对无压自浸渗制备SiCp/Al复合材料组织与性能的影响 总被引:6,自引:0,他引:6
采用无压自浸渗法制备SiCp/Al复合材料。研究了Mg含量对SiCp 与Al之间浸润性的影响 ;探讨了Mg含量对SiCp/Al复合材料的组织与性能的影响及其作用机理。结果表明 ,加入的Mg与SiCp 表面的氧化物薄膜和铝基体发生反应 ,生成物会阻止SiCp 与Al基体反应生成Al4 C3 脆性相 ,同时SiCp 表面的微反应也增加了基体与SiCp 的结合强度 ,改善了基体与SiCp 之间的浸润性 ,从而使复合材料的耐磨性提高了 3~ 4倍。 相似文献
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研究了无压渗透法制备电子封装SiCp/Al复合材料过程中,烧结工艺对SiC预制件开孔率、抗压强度的影响,以及渗透工艺对Al液渗透形成复合材料的影响,并对所制备的复合材料热物理性能和表面涂覆进行了评价。结果表明,经1100℃分段烧结的SiC预制件开孔率、抗压强度较好;Al液浇铸温度、保温温度分别在750~850℃、800~900℃的范围时,SiC预制件的渗透效果较好;所制备的55%SiCp/Al复合材料相对密度为98.3%,热膨胀系数在(7.23~9.97)×10-6K^-1之间变化,热导率为146.5~172.3W/(m.K),复合材料表面涂覆性能可行性好。 相似文献
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开展了SiC颗粒增强铝合金基复合材料挤压成形的实验研究,分析了其挤压成形的力能变化规律,结果表明,该材料的挤压载荷随着变形温度的则显著降低,在一定温度下,随着挤压位移的增加而呈现出明显的阶段性变化的特点。 相似文献
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采用无压浸渗法制备了SiCp/Al复合材料,自氧化法处理的预制型的抗压强度大幅提高,同时降低了该复合材料的残余孔隙率;基体合金中的Mg含量对复合材料的残余孔隙率有较大影响,进而影响了其抗压强度.实验结果表明,采用不同粒径的SiC颗粒配比及自氧化法处理的孔隙率为40%的SiC预制型,无压浸渗Al-11 wt%Si-6wt%Mg所制备的SiCp/Al复合材料的抗压强度为367 MPa、热膨胀系数为9.2×10-6/℃. 相似文献
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SiCp/Al复合材料的离心熔渗法制备及其性能 总被引:3,自引:5,他引:3
研究了反应离心熔渗法制备高体积比SiCp/Al复合材料的工艺过程及其抗弯强度。结果表明:通过适当的粒度配比,可在低温、低离心力下熔渗制备组织均匀的高体积比SiCp/Al复合材料,SiC颗粒体积分数可达到63%;复合材料的强度在很大程度上依赖于SiC颗粒尺寸及界面反应程度,合适的界面结合及细SiC颗粒的掺入有利于复合材料强度的提高;基体热处理改变了SiC颗粒所受应力状态,提高了复合材料的强度,其最高值可达519MPa。 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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Bc路径等径角挤压7090/SICp的显微组织及性能 总被引:2,自引:0,他引:2
采用Bc路径对超高强铝合金基复合材料7090/SICp进行等径角挤压加工.采用金相显微镜、力学性能测试及扫描电镜,分析该复合材料的显微组织和力学性能.结果表明:经过4个道次的等径角挤压加工,该复合材料的晶粒逐渐被细化,第三道次后晶粒尺寸达到1um以下;继续进行等径角挤压时,晶粒未发生明显变化.室温拉伸结果显示:晶粒的抗拉强度逐渐增大,在第三道次下道次间抗拉强度的增加幅度最大,达到14.3%,此时其抗拉强度及伸长率分别为338.57 MPa及15%;SiC颗粒在大的剪切力作用下被破碎细化,在基体中的分布也更加均匀. 相似文献
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The reheating behavior of 50 vol.% SiCp/Al squeeze casting composite was investigated at temperatures ranging from 600°C to
900°C using XRD and SEM techniques from the microstructural point of view. It was found that SiCp/Al composite could hold
its original shape while being reheated at temperatures elevated even far above the melting temperature of pure Al. The high
volume fraction of SiC reinforcement, which would restrict the fluidity of molten Al matrix and the reconfiguration of SiC
particles during the reheating of SiCp/Al composite, was thought to be responsible for the “remelting resistance” of the SiCp/Al
composite. The extent of the reaction between the SiC particles and molten Al was found to increase with increased reheating
temperature. From the viewpoint of controlling the formation of aluminum carbide, reheating temperature either for recycling
or for remelting processing of the SiCp/Al composite, a temperature lower than 750°C would be better. Despite its being unfavorable
to remelting or recycling processing, the remelting resistance of the SiCp/Al composite with high volume fraction reinforcement
is attractive for thermal function and high temperature applications. 相似文献
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含高体积分数SiCp的铝基复合材料制备与性能 总被引:13,自引:7,他引:13
以电子封装为应用对象, 通过合理选择一定粒径分布的SiC颗粒, 采用挤压铸造方法制备了SiC颗粒体积分数分别为50%, 60%和70%的3种SiCp/Al复合材料. 材料组织致密, 颗粒分布均匀. 复合材料的平均线热膨胀系数(20~100 ℃)随SiC含量的增加而降低, 在8.3×10-6~10.8×10-6/℃之间, 与Kerner模型预测值相符. 复合材料比强度和比刚度高, 均可以满足电子封装应用的技术要求. 相似文献
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液固挤压SiCp/LY12复合材料的组织与性能 总被引:1,自引:0,他引:1
探讨了液固挤压SiCp/LY12复合材料的组织与性能特征及其相互之间的关系. 研究表明, 其基体组织晶粒细小, SiC颗粒基本呈均匀随机分布, 无明显堆积及脱粘现象, 且与基体结合良好; 抗拉强度比基体材料提高20%~32%. 从而为颗粒增强金属基复合材料管、棒材的制备提供了一种减少工序、节能节材的可行方法. 相似文献
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SiCp/2024Al composite foams were manufactured by powder metallurgical methods using foaming agent CaCO3 in order to enrich the foam fabrication process and promote its development and extensive application. The effects of CaCO3 and SiC volume fractions on the foaming behaviours were investigated by means of SEM and Magiscan-2A image analysis technique. The influence of SiC content on the compressive behaviour was analyzed using Gleeble 1500 thermal simulation testing machine. The experimental results show that with increasing the foaming agent, the porosity and pore dimension increase first and decrease later. With increasing the reinforcement content, the porosity and pore dimension decrease. The compressive curves reveal that the introduction of SiC particles can improve compressive yield strength and energy absorption capacity. Meanwhile, it is found that SiCp/2024Al composite foams are the brittle foam materials. 相似文献