(湖南大学 材料科学与工程学院，长沙 410082)
摘 要: 对喷射沉积技术制备的不同硅含量铝基功能梯度复合材料进行室温摩擦学性能研究。结果表明：当硅含量分别为7%、17%和20%时，SiCp/Al-Si功能梯度复合材料的摩擦因数随载荷或滑动速度(转速)的增加而减小；随着SiC颗粒含量的增加，摩擦因数呈增大趋势；随基体硅含量增加，摩擦因数越稳定。在转速300~500 r/min、700~900 r/min和载荷10~30 N、40~50 N时，磨损率随转速、载荷的增加而升高，随SiC颗粒含量的增加而降低，梯度变化明显；在转速500~700 r/min和载荷30~40 N时，随转速、载荷的增加，磨损率反而减小；随基体硅含量的增加，磨损率呈降低趋势，材料在摩擦过程中生成的机械混合层(MML)厚度呈减小趋势。
关键字: 硅含量；喷射沉积；功能梯度复合材料；摩擦因数；磨损性能
（College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:The wear properties of spray SiCp/Al-Si functionally gradient composites with different silicon contents were investigated. The results show that, when Si contents are 7%, 17% and 20%, respectively, the friction coefficient of SiCp/Al-Si gradient composite decreases with load or speed increasing, as SiC particle contents enhancing, the friction coefficient reflects increasing trend. With Si contents adding, the friction coefficient is more stability. When Speeds are 300?500 r/min and 700?900 r/min or loads are 10?30 N and 40?50 N, the wear rate increases with speeds and loads upgrading, and decreases with SiC particle content enhancing; when the speeds are 500?700 r/min or loads are 30?40 N, the wear rate decreases with speed and load increasing; with Si contents increases, the wear rate reflects decrease trends; at the same time, with Si content increasing, thicknesses of mechanical mixing layer (MML) generated in the processes of friction and wear is reducing trends.
Key words: Si content; spray-deposited; functionally gradient composite; friction coefficient; wear performance
