(湖南大學 材料科學與工程學院，長沙 410082)
摘 要: 對噴射沉積技術(shù)制備的不同硅含量鋁基功能梯度復合材料進行室溫摩擦學性能研究。結(jié)果表明：當硅含量分別為7%、17%和20%時，SiCp/Al-Si功能梯度復合材料的摩擦因數(shù)隨載荷或滑動速度(轉(zhuǎn)速)的增加而減小；隨著SiC顆粒含量的增加，摩擦因數(shù)呈增大趨勢；隨基體硅含量增加，摩擦因數(shù)越穩(wěn)定。在轉(zhuǎn)速300~500 r/min、700~900 r/min和載荷10~30 N、40~50 N時，磨損率隨轉(zhuǎn)速、載荷的增加而升高，隨SiC顆粒含量的增加而降低，梯度變化明顯；在轉(zhuǎn)速500~700 r/min和載荷30~40 N時，隨轉(zhuǎn)速、載荷的增加，磨損率反而減小；隨基體硅含量的增加，磨損率呈降低趨勢，材料在摩擦過程中生成的機械混合層(MML)厚度呈減小趨勢。
關(guān)鍵字: 硅含量；噴射沉積；功能梯度復合材料；摩擦因數(shù)；磨損性能
（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
