多壁碳纳米管强韧化Fe_3Al复合材料  

Fe_3Al Composites Strengthened and Toughened by Multi-walled Carbon Nanotubes

作　　者：庞来学[1] 孙康宁[2] 李晋[1] 张金升[1] 

机构地区：[1]山东交通学院土木工程系,济南250023 [2]山东大学材料科学与工程学院,济南250061

出　　处：《无机材料学报》2010年第7期733-737,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(50772061);济南市高校院所自主创新计划(200906046)

摘　　要：研究了用放电等离子体烧结(SPS)方法制备了不同含量(1vol%、3vol%、5vol%、7vol%)的多壁碳纳米管(MWNTs)强韧化Fe3Al金属间化合物基复合材料的力学性能和微观结构.用X射线衍射和TEM、SEM测定其物相组成和显微结构,利用万能材料试验机对其力学性能进行测试,并对其强韧化机制进行分析.研究表明,多壁碳纳米管在烧结过程中被完整保存下来;在MWNTs含量为3vol%时,复合材料的室温断裂韧性和压缩屈服强度分别为40MPa·m1/2、3175MPa.复合材料强韧化的主要机制是碳纳米管的拔出和桥联。Novel Fe3Al composites strengthened and toughened by 1vol%,3vol%,5vol% and 7vol% multi-walled carbon nanotubes（MWNTs） were fabricated by spark plasma sintering（SPS）.X-ray diffraction（XRD）,scanning electron microscope（SEM） and transmission electron microscope（TEM） were carried out to determine the phase composition,and to analyze the microstructure and crack propagation of the composites.Fracture toughness and compressive yield strength were determined at room temperature.Then,the strengthening and toughening mechanism of MWNTs in the composites were discussed.Experimental results show MWNTs keep perfect structure intact in the composite.The fracture toughness and compressive yield strength of composite with 3vol% MWNTs reach the maximum values of 40 MPa·m^1/2 and 3175 MPa,respectively.The bridging effect on cracks and pullout of MWNTs are possible strengthening and toughening mechanisms.

关 键 词：多壁碳纳米管 Fe3Al复合材料 强韧化 力学性能 

分 类 号：TQ174[化学工程—陶瓷工业]