Preparation-microstructure-property relationships in double-walled carbon nanotubes/alumina composites |
| |
| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;2. School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China;1. Department of Mechanical Engineering, MPSTME, SVKM''s Narsee Monjee Institute of Management Studies (NMIMS), Shirpur Campus, Maharashtra 425405, India;2. Department of Mechanical Engineering, MPSTME, SVKM''s Narsee Monjee Institute of Management Studies (NMIMS), Mumbai 400056, Maharashtra, India;3. Department of Mechanical Engineering, Atria Institute of Technology, Bangalore 560024, India;1. Institute of Tools Surface Engineering, School of Mechanical Engineering, Taizhou University, Taizhou 318000, PR China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;1. Laboratory of Solid State Physics, Research Group Polymers and Nanomaterials, University Sidi Mohammed Ben Abdellah, Faculty of Sciences Dhar El Mahraz, P.O. Box 1796 Atlas, 30000 Fes, Morocco;2. Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, UMR 6502, 2 Rue de la Houssinière, 44322 Nantes, France |
| |
| Abstract: | Double-walled carbon nanotube/alumina composite powders with low carbon contents (2–3 wt.%) are prepared using three different methods and densified by spark plasma sintering. The mechanical properties and electrical conductivity are investigated and correlated with the microstructure of the dense materials. Samples prepared by in situ synthesis of carbon nanotubes (CNTs) in impregnated submicronic alumina are highly homogeneous and present the higher electrical conductivity (2.2–3.5 S cm?1) but carbon films at grain boundaries induce a poor cohesion of the materials. Composites prepared by mixing using moderate sonication of as-prepared double-walled CNTs and lyophilisation, with little damage to the CNTs, have a fracture strength higher (+30%) and a fracture toughness similar (5.6 vs 5.4 MPa m1/2) to alumina with a similar submicronic grain size. This is correlated with crack-bridging by CNTs on a large scale, despite a lack of homogeneity of the CNT distribution. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
