【作者】 王德宝； 吴玉程； 王文芳； 解挺； 宗跃； 黄新民；

【Author】 WANG De-bao WU Yu-cheng WANG Wen-fang XIE Ting ZONG Yue HUANG Xin-min (1.School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;2.Institution of Tribology,Hefei University of Technology,Hefei 230009,China;3.Composites Company,Hefei University of Technology,Hefei 230009,China)

【机构】 合肥工业大学材料科学与工程学院； 合肥工业大学摩擦学研究所； 合肥工业大学复合材料公司；

【摘要】 采用粉末冶金工艺制备不同粒径的 SiC_p(粒径分别为2 μm、10 μm、21 μm和38 μm)增强铜基复合材料, 研究增强颗粒粒径的变化对复合材料的断裂机制和摩擦磨损性能的影响。结果表明:在制备工艺相同的情况下, SiC_p 粒径为10 μm时,复合材料具有最大抗拉强度,达到265.7 MPa,其断裂机制是以 Cu-SiC 界面处基体撕裂为主:当 SiC_p 粒径较大时(>10μm),由于界面面积有限和增强颗粒间距过大,使得 SiC_p增强效果有限,其断裂机制以 Cu-SiC 界面脱粘和 SiC_p 解理开裂为主;复合材料的摩擦磨损特性也随 SiC_p 粒径的变化而发生明显改变,在低载荷条件下(载荷≤80 N),增大 SiC_p 粒径有助于提高材料的耐磨性,但偶件磨损率增加,其磨损机制以磨粒磨损为主;随着载荷的增加,由于大粒径 SiC_p 易于破碎,承载作用下降,加之材料强度较低,导致剥层磨损发生, 使得复合材料磨损率剧增。更多还原

【Abstract】 The copper matrix composites reinforced by SiC_p with various sizes of about 2 μm,10 μm,21 μm and 38 μm, respectively were fabricated via powder metallurgy technique.The effect of various sizes reinforced particles on the fracture mechanism,friction and wear behavior of Cu/SiC_p composites were investigated.The results indicate that under the same preparing parameters,the composites with SiC_p 10 μm in size possess the highest ultimate tensile strength of beyond 265.7 MPa,and their breakage is due to tearing of matrix near Cu-SiC interface.The composites with large particle(>10 μm) possess finite strength owing to the limited interracial area and large space between SiC particles,and the interracial debonding and SiC_p cleavage crack have prominent effect on the failure mechanism of composites.The friction and wear properties of Cu/SiC_p composites obviously differ with the changing SiC_p size.When the applied load is lower than 80 N,the SiC_p with larger size is helpful to improve the wear resistance of Cu/SiC_p composites.However,the composites reinforced with large SiC_p particulates increases the wear rate of the counterpart steel,and the wear mechanism is mainly abrasive wear.When the applied load increases,because SiC_p particles with large size is easy to mash,both the load carrying capacity and the composites strength decrease,which leads to the occurrence of delamination wear,and the wear rate is sharply enhanced.更多还原