Yoo Sung Chan, Kang Byungchul, Van Trinh Pham, Phuong Doan Dinh, Hong Soon Hyung
Department of Material Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Korea.
Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 Beon-gil, Yuseong, Daejeon, 34057, Korea.
Sci Rep. 2020 Jul 30;10(1):12896. doi: 10.1038/s41598-020-69341-z.
Novel one-dimensional template-grown coaxial SiC@carbon nanotubes (SiC@CNTs) were fabricated using a chemical vapor deposition method. To facilitate the formation of SiC on CNT template, a molecular-level mixing process was used to coat the surface of commercial multiwalled carbon nanotubes (MWCNTs) by FeO. These Fe-CNTs were transformed into SiC@CNT nanotubes, which were then mixed with Al6061 alloy and consolidated by spark plasma sintering to obtain Al6061-SiC@CNT nanocomposites. The addition of 5 vol% SiC@CNT resulted in 58% enhancement in Young's modulus and 46% enhancement in yield strength. Furthermore, the friction coefficient was reduced by 31% and the specific wear rate was reduced by 45%. The enhancement effect of Al6061-SiC@CNT on the mechanical and tribological properties was much greater than those of traditional nanoparticles, nanowires, and whiskers of SiCs. The extraordinary strengthening behavior of SiC@CNT, when compared with that of other SiC analogues, is attributed to the coaxial structure consisting of a SiC shell and CNT core. This coaxial structure enhanced the mechanical and tribological properties beyond that attainable with traditional SiC-derived reinforcements.
采用化学气相沉积法制备了新型一维模板生长的同轴碳化硅@碳纳米管（SiC@CNTs）。为了促进在碳纳米管模板上形成碳化硅，采用分子水平混合工艺用FeO包覆商用多壁碳纳米管（MWCNTs）的表面。这些Fe-碳纳米管被转化为SiC@碳纳米管，然后与Al6061合金混合并通过放电等离子烧结进行固结，以获得Al6061-SiC@碳纳米管纳米复合材料。添加5体积%的SiC@碳纳米管使杨氏模量提高了58%，屈服强度提高了46%。此外，摩擦系数降低了31%，比磨损率降低了45%。Al6061-SiC@碳纳米管对力学性能和摩擦学性能的增强效果远大于传统的碳化硅纳米颗粒、纳米线和晶须。与其他碳化硅类似物相比，SiC@碳纳米管具有非凡的强化行为，这归因于由碳化硅壳和碳纳米管芯组成的同轴结构。这种同轴结构增强了力学性能和摩擦学性能，超出了传统碳化硅衍生增强材料所能达到的水平。
