Si元素对碳纳米管增强铝基复合泡沫组织与性能的影响  

Effect of Si on microstructure and properties of carbon nanotubes reinforced aluminum matrix composite foams

作　　者：杨旭东[1] 郑远兴 李威挺 肖冠宇 纵荣荣 YANG Xudong;ZHENG Yuanxing;LI Weiting;XIAO Guanyu;ZONG Rongrong(Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin 300300,China;School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China;Tianjin Jinliyan Automotive Engineering&Technology Co.Ltd.,Tianjin 300392,China)

机构地区：[1]中国民航大学中欧航空工程师学院,天津300300 [2]天津大学材料科学与工程学院,天津300072 [3]天津金力研汽车工程技术有限公司,天津300392

出　　处：《复合材料学报》2021年第1期186-197,共12页Acta Materiae Compositae Sinica

基　　金：天津市科技计划项目(20YDTPJC01600)。

摘　　要：针对金属基复合材料,添加合金元素是提升其综合性能的有效途径。本文通过高能球磨和填加造孔剂法,制备了添加Si元素的碳纳米管(CNTs)增强铝基(CNTs/Al-Si)复合泡沫,通过准静态压缩实验测试其压缩性能和吸能性能,进一步研究烧结温度和不同Si元素含量对CNTs/Al-Si复合泡沫微观组织、压缩性能和吸能性能的影响,并结合压缩断口形貌分析其断裂失效机制。结果表明:随着烧结温度的升高,CNTs/AlSi复合泡沫的致密度和结合性提高,当烧结温度为600℃、Si质量分数为7wt%时,CNTs/Al-Si复合泡沫的屈服强度、平台应力和吸能性能,较烧结温度为550℃时分别提高了98.4%、167.7%和166.4%;Si元素的添加可以在球磨过程中细化复合粉末颗粒,经合金化后的CNTs/Al-Si复合泡沫强度和塑性均有所改善。与CNTs/Al复合泡沫相比,Si质量分数为7wt%的CNTs/Al-Si复合泡沫屈服强度和平台应力分别提高了58.5%和117.8%,吸能性能明显提高。For metal matrix composite materials,adding alloying elements is an effective way to improve its comprehensive performance.In the present study,the carbon nanotubes(CNTs)reinforced aluminum matrix(CNTs/AlSi)composite foams with Si element were prepared by high-energy-ball milling and space holder method.Quasistatic compression test was carried out to study the compression properties and energy absorption performance of CNTs/Al-Si composite foams.The effects of sintering temperature and Si content on the microstructure,compression and energy absorption properties of the CNTs/Al-Si composite foams were further studied.The fracture failure mechanism was analyzed by the compression fracture morphology.The results show that the density and bonding of the CNTs/Al-Si composite foams increase with the increment of sintering temperature.When the sintering temperature is 600℃,mass fraction of Si is 7 wt%,the yield strength,plateau stress,and energy absorption performance of CNTs/Al-Si composite foams are 98.4%,167.7%,and 166.4%higher than that of the sintering temperature of550℃,respectively.Moreover,the addition of Si element can refine composite powders during ball milling.Both of the strength and plasticity for the CNTs/Al-Si composite foams are improved after alloying.Compared with CNTs/Al composite foams,the yield strength and plateau stress of the CNTs/Al-Si composite foams with Si mass fraction of 7 wt%increase by 58.5%and 117.8%,respectively.Meanwhile the energy absorption performance is significantly improved.

关 键 词：碳纳米管(CNTs) 泡沫铝 SI元素 压缩性能 吸能性能 

分 类 号：TB331[一般工业技术—材料科学与工程]