Ulloa-Castillo Nicolas A, Martínez-Romero Oscar, Hernandez-Maya Roberto, Segura-Cárdenas Emmanuel, Elías-Zúñiga Alex
Department of Mechanical Engineering and Advanced Materials, School of Engineering and Sciences, Tecnologico de Monterrey Av. Eugenio Garza Sada Sur 2501, Monterrey 64849, Nuevo León, Mexico.
Research and Development Department, Siemens, Libramiento Arco Vial Poniente Km 4.2, Santa Catarina 66350, Nuevo León, Mexico.
Materials (Basel). 2021 Jan 14;14(2):373. doi: 10.3390/ma14020373.
This paper focuses on reporting results obtained by the spark plasma sintering (SPS) consolidation and characterization of aluminum-based nanocomposites reinforced with concentrations of 0.5 wt%, 1 wt% and 2 wt% of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). Experimental characterization performed by SEM shows uniform carbon nanotube (CNT) dispersion as well as carbon clusters located in the grain boundary of the Al matrix. The structural analysis and crystallite size calculation were performed by X-ray diffraction tests, detecting the characteristic CNT diffraction peak only for the composites reinforced with MWCNTs. Furthermore, a considerable increment in the crystallite size value for those Al samples reinforced and sintered with 1 wt% of CNTs was observed. Hardness tests show an improvement in the composite surface hardness of about 11% and 18% for those samples reinforced with 2 wt% of SWNCTs and MWCNTs, respectively. Conductivity measurements show that the Al samples reinforced with 2 wt% of MWCNTs and with 0.5 wt% SWCNTs reach the highest IACS values of 50% and 34%, respectively.
本文重点报道了通过火花等离子烧结（SPS）对分别用浓度为0.5 wt%、1 wt%和2 wt%的单壁碳纳米管（SWCNT）和多壁碳纳米管（MWCNT）增强的铝基纳米复合材料进行固结和表征所获得的结果。通过扫描电子显微镜（SEM）进行的实验表征显示，碳纳米管（CNT）分散均匀，并且在铝基体的晶界处存在碳簇。通过X射线衍射测试进行结构分析和微晶尺寸计算，仅在由MWCNT增强的复合材料中检测到特征性的CNT衍射峰。此外，观察到用1 wt%的CNT增强并烧结的铝样品的微晶尺寸值有相当大的增加。硬度测试表明，对于分别用2 wt%的SWNCT和MWCNT增强的样品，复合表面硬度分别提高了约11%和18%。电导率测量表明，用2 wt%的MWCNT和0.5 wt%的SWCNT增强的铝样品分别达到了50%和34%的最高国际退火铜标准（IACS）值。
