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以微米级W粉和碳纳米管(CNTs)为原料,采用放电等离子烧结(SPS)技术制备了钨基复合材料,研究和分析了CNTs对W显微组织结构和室温力学性能的影响,研究表明,在SPS过程中,CNTs与W发生原位反应生成W_2C,一方面活化了W的晶格,促进了W的烧结致密化,另一方面,W_2C的形成消耗了部分烧结驱动力,有效延缓了W的晶粒长大.当CNTs的加入量为0.5%时,可获得平均晶粒尺寸为4μm,相对密度大于99%,抗弯强度和硬度分别为1353.90 MPa和488.4 HV的钨基复合材料.
The tungsten matrix composites were prepared by spark plasma sintering (SPS) using micron-sized W powders and carbon nanotubes (CNTs) as raw materials. The effects of CNTs on W microstructure and room-temperature mechanical properties were studied and analyzed. In the SPS process, CNTs and W react in situ to form W_2C, which on the one hand activates the lattice of W and promotes the densification of W. On the other hand, the formation of W_2C consumes some sintering driving forces and effectively delays W were obtained.When the amount of CNTs was 0.5%, the tungsten matrix composites with average grain size of 4μm, relative density of more than 99%, flexural strength and hardness of 1353.90 MPa and 488.4 HV, respectively, were obtained.