Characteristics of powder metallurgy pure titanium matrix composite reinforced with multi-wall carbon nanotubes
Characteristics of powder metallurgy pure titanium matrix composite reinforced with multi-wall carbon nanotubes
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DOI：
10.1016/j.compscitech.2009.01.026
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发表时间：
2009-06
影响因子：
9.1
通讯作者：
K. Kondoh;T. Threrujirapapong;H. Imai;J. Umeda;Bunshi Fugetsu
中科院分区：
文献类型：
--
作者：
K. Kondoh;T. Threrujirapapong;H. Imai;J. Umeda;Bunshi Fugetsu
以纯钛粉末为原料，采用湿法包覆非成束多壁碳纳米管（MWCNTs），通过放电等离子烧结（SPS）和热挤压工艺制备了碳纳米管增强粉末冶金（P/M）钛基复合材料（TMC）。评价了粉末冶金纯钛和碳纳米管增强纯钛的显微组织和力学性能。利用光学显微镜和扫描电子显微镜（SEM）研究了烧结过程中碳纳米管和原位生成的碳化钛（TiC）化合物的分布。碳纳米管的加入显著提高了TMC的力学性能。例如，当使用涂覆有0.35质量%的CNT的纯钛复合粉末时，挤出TMC的拉伸强度和屈服应力的增加与不具有CNT添加剂的挤出钛材料的拉伸强度和屈服应力相比分别为157 MPa和169 MPa。拉伸试样断口的扫描电镜分析表明，碳纳米管和TiC颗粒在TMC表面均匀分布，起到了弥散强化的作用。
By using pure titanium powder coated with un-bundled multi-wall carbon nanotubes (MWCNTs) via wet process, powder metallurgy (P/M) titanium matrix composite (TMC) reinforced with the CNTs was prepared by spark plasma sintering (SPS) and subsequently hot extrusion process. The microstructure and mechanical properties of P/M pure titanium and reinforced with CNTs were evaluated. The distribution of CNTs and in situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyzer. The mechanical properties of TMC were significantly improved by the additive of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35mass%, the increase of tensile strength and yield stress of the extruded TMC was 157MPa and 169MPa, respectively, compared to those of extruded titanium materials with no CNT additive. Fractured surfaces of tensile specimens were analyzed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed.