SiC体积分数对铜基复合材料性能的影响  

Effect of SiC content on properties of copper matrix composites

作　　者：蔡佳宁 樊子民[1] 乐晨 李鑫 唐明强 赵放 CAI Jianing;FAN Zimin;LE Chen;LI Xin;TANG Mingqiang;ZHAO Fang(College of Materials Science and Engineering,Xi′an University of Science and Technology,Xi′an 710000,China;TIZ Advanced Alloy Technology Co.,Ltd.,Quanzhou 362000,Fujian,China)

机构地区：[1]西安科技大学材料科学与工程学院,西安710000 [2]泉州天智合金材料科技有限公司,福建泉州362000

出　　处：《金刚石与磨料磨具工程》2023年第6期743-749,共7页Diamond & Abrasives Engineering

摘　　要：采用热压粉末冶金法引入Al和Mg元素制备SiC/Cu复合材料,研究SiC体积分数对SiC/Cu复合材料性能的影响。采用X射线衍射、阿基米德排水法、三点弯曲法和扫描电镜分析复合材料样品的物相组成、相对密度、力学性能及微观形貌,并测定其导热系数和热膨胀系数,用ROM混合定律和Turner模型预测复合材料的热膨胀系数。结果表明:试样基体中生成了AlCuMg相,强度大幅增加,且以混合型断裂为主;当SiC体积分数较低时,SiC颗粒在基体中分散较均匀。当SiC体积分数为35%时,SiC/Cu复合材料的致密度、抗弯强度、导热系数和热膨胀系数分别为98.81%、478 MPa、254.76 W/(m·K)和11.84×10^(-6)/K。随着SiC体积分数的增加,SiC颗粒团聚较严重,复合材料的致密度、抗弯强度、导热系数和热膨胀系数随之降低,其硬度呈先增加后降低的趋势,在SiC体积分数为45%时达到最大值110 HRB。Turner模型的预测值与复合材料实测值最为接近。SiC/Cu composites were prepared by hot-pressing powder metallurgy with Al and Mg elements,and the effect of SiC volume percentage on the properties of SiC/Cu composites was studied.X-ray diffraction,Archimedes drainage method,three-point bending method and scanning electron microscope were used to analyze the phase composition,relative density,mechanical properties and micro-morphology of the composite samples,and the thermal conductivity and thermal expansion coefficient were measured.The thermal expansion coefficient of the composite was predicted by ROM mixing law and Turner model.Experimental results show that AlCuMg phase is formed in the matrix of the sample,and the strength is greatly increased,and the mixed fracture is the main type of the sample.The SiC particles are uniformly dispersed in the matrix when the SiC content is low.The density,bending strength,thermal conductivity and thermal expansion coefficient of SiC/Cu composites are 98.81%,478 MPa,254.76 W/(m·K)and 11.84×10^(-6)/K respectively when the SiC content is 35%.When the content of SiC increases,the agglomeration of SiC particles is serious,and the density,bending strength,thermal conductivity and thermal expansion coefficient of the composites decrease.Its hardness increases at first and then decreases,and reaches the maximum value of 110 HRB when the SiC content is 45%.The Turner model is the closest to the measured values of composites.

关 键 词：SIC/CU复合材料 AlCuMg 力学性能 热学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]