Mechanical Properties of Single-Walled Carbon Nanotube Solids Prepared by Spark Plasma Sintering
Mechanical Properties of Single-Walled Carbon Nanotube Solids Prepared by Spark Plasma Sintering
复制标题
DOI：
10.1299/jmmp.1.854
复制
发表时间：
2005-02
期刊：
影响因子：
--
通讯作者：
G. Yamamoto;Y. Sato;Toru Takahashi;M. Omori;K. Tohji;T. Hashida
中科院分区：
文献类型：
--
作者：
G. Yamamoto;Y. Sato;Toru Takahashi;M. Omori;K. Tohji;T. Hashida
采用放电等离子烧结（SPS）方法对单壁碳纳米管（SWCNTs）进行了固化，并采用小冲杆（SP）测试方法研究了烧结条件对单壁碳纳米管固体力学性能的影响。烧结温度范围为600-1 400°C，烧结压力为40 MPa和120 MPa。结果表明，SPS方法允许单壁碳纳米管固化，没有任何添加剂。实验结果表明，原烟的净化至关重要。由纯化的原烟灰制备的单壁碳纳米管固体表现出显着的非线性变形响应，产生准韧性断裂行为。相比之下，未纯化的原烟灰产生脆性SWCNT固体。杨氏模量、断裂强度和断裂功随烧结温度和压力的升高而增大。拉曼散射和扫描电镜观察表明，随着温度和压力的升高，类石墨材料的数量增加，表明单壁碳纳米管的结构发生了部分变化，形成了类石墨材料。类石墨材料的形成增加了单壁碳纳米管固体的脆性断裂倾向。TEM观察显示，单壁碳纳米管固体的断裂表面的特征在于单壁碳纳米管束的拉出。这一观察结果表明，通过增加SWCNT之间的内聚力来改善SWCNT固体的机械性能是可能的。
In this paper, a spark plasma sintering (SPS) method was employed to solidify single-walled carbon nanotubes (SWCNTs) only, and the effect of sintering conditions on the mechenical properties of the SWCNT solids were examined using a small punch (SP) testing method. The sintering temperature used in the range of 600-1 400°C, and the sintering pressure used 40 MPa and 120 MPa. It was demonstrated that the SPS method allowed SWCNTs to be solidified, without any additives. The experimental results showed that the purification of raw soot was critically importance. The SWCNT solid prepared from purified raw soot showed significant non-linear deformation response, producing quasi-ductile fracture behavior. In contrast, unpurified raw soot produced brittle SWCNT solids. The Young's modulus, fracture strength and work of fracture increased with increasing sintering temperature and pressure. The Raman scattering and SEM observations showed that the amount of the graphite-like materials were observed to increase with the increasing temperature and pressure, which indicate that the structure of the SWCNTs was changed partially into the graphite-like materials. The formation of graphite-like materials increased tendency of brittle fracture in the SWCNT solids. TEM observations revealed that the fracture surfaces of SWCNT solids were characterized by pull out of SWCNT bundles. This observation suggests that it may be possible to improve the mechanical properties of SWCNT solids by increasing the cohesion between SWCNTs.