Cf表面修饰对C_(f-包覆Cu)/Mg_2Si-Al_2O_3复合材料组织与性能的影响  

Effect of Cfsurface modification on microstructure and properties of composite C_(f-Cu coated)/Mg_2Si-Al_2O_3

作　　者：臧树俊[1] 周琦[1] 李亚玮[1] 郑斌 ZANG Shu-jun;ZHOU Qi;LI Ya-wei;ZHENG Bin(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2018年第2期7-11,共5页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(1610RJZA010)

摘　　要：用电化学的方法对碳纤维表面进行包覆Cu修饰,并采用机械合金化+热压烧结制备C_(f-包覆Cu)/Mg_2Si-Al_2O_3复合材料,研究C_(f-包覆Cu)质量分数对该复合材料组织、密度、强度及导电率的影响.结果表明:电化学包覆Cu修饰的Cf加入后并未生成新相,而是均匀地分布在复合材料中,与基体之间界面平直,结合良好.Al_2O_3主要分布在Mg_2Si基体的晶界处,部分分布在C_(f-包覆Cu)周围.随着C_(f-包覆Cu)质量分数的增加,致密度有所降低,复合材料电导率、硬度、抗压强度和抗弯强度均先增大后降小,在1.5%时取得最大值.复合材料的强化主要是纤维拔出.Electrochemical method was used to modify the surface of carbon fiber with Cu coat and the componsite C f-coated Cu/Mg 2Si-Al 2O 3 was prepared by mechanical alloying and hot pressing sintering.Then the effect of content of C f coated with Cu on the microstructure,compactedness,strength,and conductivity of this componsite was investigated.The result showed that the C f electrochemically coated with Cu would not make a new phase to form but distribute uniformly in the composite,and the interface with the matrix would be smooth and well bonded.Al 2O 3 would mainly distribute on the grain boundary of Mg 2Si matrix and partially distribute around C f-Cu coated.With the increase of mass fraction of C f-Cu coated,the compactedness would decrease to some extent and the conductivity,hardness,compressive strength and flexural strength of the composite would increase at first and then decrease,reaching their maximum values when the mass fraction was 1.5%.The strengthening of composite would mainly be due to the pullout of the fibers.

关 键 词：碳纤维 热压烧结 MG2SI 组织 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]