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Microwave-assisted sintering of Al2O3-MWCNT nanocomposites

Ghobadi, H ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2017.02.003
  3. Publisher: Elsevier Ltd , 2017
  4. Abstract:
  5. Alumina-MWCNT composite was densified by microwave sintering. CNTs were coated with boehmite nanoparticles to enhance their distribution in composite samples. Calcination temperature of composite powder was determined by TGA analysis (5 °C/min). Samples containing 0 and 1vol%CNT were produced by cold isostatic pressing at 180 MPa. Microwave sintering (1520 °C for 45 min) was conducted under the flow of argon. Phase analysis of the calcined composite powder showed complete transformation of boehmite into gamma-alumina. The relative densities were 99.3% and 98.1% for monolithic alumina and composite, respectively. CNT addition improved the fracture toughness of alumina by ~37%. SEM images showed that microwave sintering was successful. Also, coating CNTs improved their distribution in the alumina matrix. © 2017 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Microwave sintering ; Nanocomposites ; Nano-composite ; Toughness ; Alumina ; Calcination ; Corundum ; Fracture toughness ; Microwave heating ; Microwaves ; Multiwalled carbon nanotubes (MWCN) ; Alumina-MWCNT ; Pressing (forming) ; Sintered alumina ; Boehmite nanoparticles ; Calcination temperature ; Calcined composites ; Cold isostatic pressing ; Composite samples ; Microwave assisted ; Monolithic alumina ; Sintering
  8. Source: Ceramics International ; Volume 43, Issue 8 , 2017 , Pages 6105-6109 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S027288421730192X