碳纳米管含量对汽车刹车片铝合金显微组织和性能的影响  

Effect of CNTs Content on Microstructure and Properties of Aluminum Alloy for Automobile Brake Pads

作　　者：周大伟[1] 李飞 ZHOU Da-wei;LI Fei(Department of mechanical and electrical engineering,Yongcheng vocational college,Yongcheng 476600,Henan,China;Zhejiang Kaifeng New Material Co.,Ltd.,Hangzhou 314599,Zhejiang,China)

机构地区：[1]永城职业学院机电工程系,河南永城476600 [2]浙江凯风新材料有限公司,浙江杭州314599

出　　处：《铸造》2022年第5期610-613,共4页Foundry

基　　金：2020年度浙江省重点研发计划(2020A01005)。

摘　　要：采用超声振动法制备汽车刹车片用CNTs/A356铝合金,并研究了不同碳纳米管含量对铝合金硬度、孔隙率和耐磨性能的影响。结果表明,随着碳纳米管含量的增加,CNTs/A356铝合金的α-Al相晶粒尺寸和硬度先增大后减小,孔隙率和磨损量先减小后增大,过量的碳纳米管会发生团聚,使得铝合金硬度变小、孔隙率变大、耐磨性变差。当碳纳米管含量为0.8%时,铝合金的微观组织细化最明显,碳纳米管未出现明显的团聚现象,铝合金的硬度达到HV112,孔隙率为0.81%,磨损量为3.56 mg,相比于基体分别增大了36.6%、降低了35.2%和57.7%。CNTs/A356 aluminum alloy for automobile brake pad was prepared by ultrasonic vibration,and the effects of different CNTs contents on the hardness,porosity and wear resistance of the aluminum alloy were studied.The results showed that with the increase of the CNTs content,theα-Al phase size and hardness of the CNTs/A356 aluminum alloy increased at first and then decreased,and the porosity and wear loss decreased at first and then increased.Excessive agglomeration of the CNTs made the hardness smaller,the porosity larger and the wear resistance worse.When the content of the CNTs was 0.8%,the microstructural refinement of the aluminum alloy was the most obvious,and there is no obvious agglomeration of the CNTs.The hardness of the aluminum alloy reached HV112,the porosity was 0.81%,and the wear loss was 3.56 mg,which is 36.6%higher,35.2%lower and 57.7%lower than those of the matrix.

关 键 词：超声振动 汽车刹车片 碳纳米管 硬度 耐磨性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]