Improving CNT distribution and mechanical properties of MWCNT reinforced alumina matrix

Ghobadi, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2014.08.052
  3. Abstract:
  4. In this work, an attempt was made to improve the distribution of CNTs in CNT/alumina nanocomposites. The composite powders containing 1 and 3vol% of CNTs were produced and calcined at 500°C for 2h. Surface coating with boehmite nanoparticles was used to improve CNT distribution in alumina matrix. Calcined powders were shaped into compacted samples by cold isostatic pressing at 180MPa and sintered at 1600°C for 2h in flowing gas atmosphere (95%Ar+5%H2). Phase analysis of the calcined composite powders showed complete transformation of boehmite into gamma-alumina. The maximum flexural strength was 465±31MPa corresponding to addition of 1vol% CNTs. Evaluating the fracture toughness via DCM method revealed a constant enhancement and the highest toughness was 4.7±0.3MPa.m1/2 corresponding to composites containing 3vol% of CNTs
  5. Keywords:
  6. Ceramics ; Composites ; Mechanical characterization ; Nanostructured materials ; Nanostructured materials ; Alumina matrix ; Mechanical characterizations ; Composite materials
  7. Source: Materials Science and Engineering A ; Vol. 617 , 2014 , pp. 110-114 ; ISSN: 09215093
  8. URL: http://www.sciencedirect.com/science/article/pii/S0921509314010521