碳纳米管对W显微组织结构及其性能的影响  

EFFECT OF CARBON NANOTUBES ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF W

作　　者：谈军[1] 周张健[1] 刘亚勤[1] 屈丹丹[1] 钟铭[1] 葛昌纯[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《金属学报》2011年第12期1555-1560,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金重点项目50634060;国家磁约束核聚变能研究专项基金项目2010GB109000资助~~

摘　　要：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.W -based composites were fabricated by spark plasma sintering（SPS） using W powders and carbon nanotubes（CNTs） as raw materials.The effect of the CNTs on the microstructure and room temperature mechanical properties of W was investigated.The results show that the W_2C was formed through the reaction of CNTs and W during the SPS process.The formation of the W_2C activated the sintering of W and enhanced the densification of W.On the other hand,the in situ formation of W_2C decreased the driving force of sintering and consequently inhibited the grain growth of W at high temperature.The grain size,relative density,bending strength and the Vicker＇s hardness of W composites were 4μm,99%,1353.9 MPa and 488.4 HV respectively when the content of CNTs was 0.5%.

关 键 词：W 碳纳米管 放电等离子烧结 W2C 

分 类 号：TG146.4[一般工业技术—材料科学与工程]