多壁碳纳米管对CuSn-Co系胎体力学性能的影响

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。

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

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/cm3,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 CuSn-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 respective-ly. 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 ma-trix,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 sin-tering temperature is 850℃,and the hot pressing pressure is 35 MPa.