NbC颗粒对铜基复合材料性能的影响

Effect of NbC Particles on the Properties of Copper Matrix Composites

以NbC颗粒和电解Cu粉为原料,采用微波烧结制备了添加1%、2%、3%、4%NbC颗粒的NbC增强铜基复合材料,通过对显微组织的观察和对密度、硬度和电导率的测试,探索了NbC质量分数、微波烧结温度对铜基复合材料性能的影响。结果表明:铜基体内NbC颗粒除少量颗粒团聚长大外,其他颗粒能均匀分布在基体上;随着烧结温度的升高,铜基复合材料的密度、导电率和硬度均有所增加:密度从5.8 g/cm^(3)左右最高上升到7.208 g/cm^(3);导电率从低于10%IACS最高提高到63.8%IACS;硬度从35 HV最高提高到了64.5 HV;随着增强相质量分数的增加,1000℃时硬度从36 HV提高到了64.5 HV,密度从7.208 g/cm^(3)下降到了5.86 g/cm^(3),导电率从63.8%IACS下降到了24.1%IACS;导电率在NbC质量分数为1%时,烧结温度影响较明显,烧结温度为1000℃时,导电率达到最大,为63.8%IACS。

NbC particle reinforced copper matrix composites with 1%,2%,3%and 4%NbC were prepared via microwave sintering using niobium carbide particles and electrolytic copper powder as raw materials.The effects of niobium carbide mass fraction and microwave sintering temperature on the properties of copper matrix composites were investigated by observing the microstructure and testing the density,hardness,and conductivity.The results show that the NbC particles in the copper matrix can be evenly distributed on the matrix except for a small amount of particles that agglomerate and grow up;with the increase of sintering temperature,the density,conductivity and hardness of copper matrix composites increased:the density increased from 5.8 g/cm^(3)to 7.208 g/cm^(3);the conductivity increased from less than 10%IACS to 63.8%IACS.The hardness increased from 35 HV to 64.5 HV.With the increase of the mass fraction of the reinforced phase,the hardness increased from 36 HV to 64.5 HV at 1000℃,the density decreased from 7.208 g/cm^(3)to 5.86 g/cm^(3),and the conductivity decreased from 63.8%IACS to 24.1%IACS.When the mass fraction of NbC is 1%,the influence of sintering temperature is obvious.When the sintering temperature is 1000℃,the conductivity reaches the maximum,which is 63.8%IACS.