多壁碳纳米管对CuSn-Co系胎体力学性能的影响  

Influence of multi-walled carbon nanotubes on the mechanical properties of CuSn-Co matrix

作　　者：徐强[1] 刘一波[1,2] 徐良[2] 杨志威[2] XU Qiang LIU Yi-bo XU Liang YANG Zhi-wei(Central Iron and Steel Research Institute, Beijing 100081, China Beijing Gang Yan Diamond Products Company, Beijing 102200, China)

机构地区：[1]钢铁研究总院,北京100081 [2]北京安泰钢研超硬材料制品有限责任公司,北京102200

出　　处：《粉末冶金工业》2017年第5期25-31,共7页Powder Metallurgy Industry

摘　　要：碳纳米管具有超强的力学性能和优异的物理性能(弹性模量达1.0~1.8 TPa,抗拉强度达150 GPa,密度可达0.8 g/cm^3,热膨胀系数几乎为零),是复合材料的理想增强体。通过正交试验设计研究了多壁碳纳米管(MWCNT)的添加量、烧结温度、热压压力对CuSn-Co系胎体力学性能的影响,并分别通过直接分析法和方差分析法分析了3因素对胎体力学性能的影响程度及对胎体性能影响的显著性,采用扫描电镜观察其断口形貌。结果表明:碳纳米管的添加量对胎体的硬度和抗弯强度有非常显著的影响,其次是热压压力有显著影响,而烧结温度影响较小,最终的优选方案为:MWCNT添加质量分数为0.8%,热压温度为850℃,热压压力为35 MPa。Carbon nanotubes have superior mechanical properties and excellent physical properties（with elastic modulus of 1.0-1.8 TPa,tensile strength of 150 GPa,density of up to 0.8 g/cm^3,thermal expansion coefficient of almost zero）,which is the ideal reinforcement for composite materials. The effects of the multi-walled carbon nanotubes（MWCNT）addition,sintering temperature and hot pressing pressure on the mechanical properties of Cu Sn-Co matrix were investigated by orthogonal experimental design,and influence degree of the three factors on the mechanical properties of the matrix were analyzed by means of direct analysis and variance analysis respectively. The fracture morphology was also observed through scanning electron microscope. Experimental results show that the carbon nanotubes addition has the most significant influence on the hardness and bending strength of matrix,followed by hot pressing pressure,which has the second significant influence,and the sintering temperature has little effect. The final optimum scheme is as follows：the addition of MWCNT is 0.8%（mass percent）,the sintering temperature is 850 ℃,and the hot pressing pressure is 35 MPa.

关 键 词：金刚石钻头 多壁碳纳米管 纳米增强 性能 

分 类 号：TB33[一般工业技术—材料科学与工程]