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金属学报  2011 

碳纳米管对W显微组织结构及其性能的影响

DOI: 10.3724/SP.J.1037.2011.00398, PP. 1555-1560

Keywords: W,碳纳米管,放电等离子烧结,W2C

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Abstract:

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W2C,一方面活化了W的晶格,促进了W的烧结致密化,另一方面,W2C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1353.90MPa和488.4HV的钨基复合材料.

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