碳纳米管增强铝基复合材料制备与性能研究.pdf

合肥工业大学硕士学位论文碳纳米管增强铝基复合材料制备与性能研究姓名:姚辉申请学位级别:硕士专业:材料学指导教师:刘宁;李清文 201203 碳纳米管增强铝基复合材料制备与性能研究摘要 T)发现以来,T具有优异的机械性能已经吸引了一大批研究者的关注。T具有非常高的强度和杨氏模量,成为复合材料中一种非常有用的增强材料。碳纳米管增强铝基复合材料由于其高强轻质的特点有望在今后航空航天和汽车领域中得到广泛应用。 Ts/Al复合粉体,然后经过后续的冷压、烧结、热压和热挤工艺,Ts/A1) 复合材料。测试复合材料的抗拉强度(UTS)和硬度(HB),通过扫描电子显微镜(SEM)观察复合材料断口组织,分析了两种制各工艺对复合材料力学性能的影响,并从微观分析了复合材料的增强方式和断裂机理。 T含量为l%的复合粉末,冷压成型,并在600℃烧结6h,随后经过500℃热压和550℃热挤制备得到的复合材料。干法和湿法制备的复合材料抗拉强度分别为241 MPa和206 MPa。通过SEM观察其断口发现利用干法混粉工艺制备的复合材料断口组织致密,基体结合强度好,韧窝分布均匀,T存在。而后者基体结合强度不高,断口观察发现在拉伸过程中有从基体撕裂的现象,组织不致密,存在大量的孔洞。故确定干法混粉工艺这条路线为最佳的制备方案。Ts/Al复合材料,经过一系列对比试验发现: ℃烧结6h制备得到的样品具有最高的抗拉强度和硬度。 T管径对复合材料力学性能有较大影响,T制备的复合材料具有最高力学性能。 ,10-209m粒径的铝粉末制备的复合材料具有最高力学性能。 %时的样品具有最高的抗拉强度和硬度。关键词:T) 铝基复合材料力学性能 Preparation and mechanical properties ofcarbon nanotubes reinforced posite ABSTRACT Since the discovery in 991,carbon Ts)have attracted great attention due to their exellent mechanical,physical and chemical properties. Especially,their strength and Young’S bined with perfect tublar structure make them as ideal structural reinforcements in varieties a kind of the most important ligh metal—Ts reinforeed Ts/AI)posites possess a wide application in thefieldofaerospace and automobile due to theadvantages of high strength,low density and good abrasion resistance. Inthe paper,Ts/posite powders are prepared through the two kinds ofstrategies:dry route and wet Ts/posites are fabricated through the following processes: pression, sintering, hot-pressing and hot— tensile strength(UTS)and hardness(HB)of posites were microstructures and fracture surfaces were observed bv scanning electron microscope(SEM).The influences of the two kinds ofmethods on theproperties fracturebehavior andreinforcement mechanism posites were discussed. Ts/posite powders are fabricated through dry mixing and wet mixing process,,they were densified by p