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Toughening mechanisms of SiC-bonded CNT bulk nanocomposites prepared by spark plasma sintering

Dolati, S ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijrmhm.2017.10.024
  3. Publisher: Elsevier Ltd , 2018
  4. Abstract:
  5. In this work, silicon carbide (SiC) was utilized as a binding agent to fuse carbon nanotubes (CNTs) into highly tough dense CNT bulk nanocomposites through spark plasma sintering (SPS) method. Phase studies were performed using x-ray diffraction analysis (XRD) and field-emission scanning electron microscopy (FESEM) and obtained results were verified by the microstructural evolution. Also, the optimum processing temperature was determined as 1600 °C at which the undesired allotropic phase transformation of SiC (β) → SiC (α) was avoided and single-walled CNTs (SWCNTs) were structurally preserved. Fracture toughness of the nanocomposite synthesized at optimum processing conditions was determined by Vickers indentation method equal to 13.3 MP·m1/2. Toughening mechanisms were directly observed throughout the microstructure among which crack-wake bridging by SWCNTs and crack deflection by SiC particles were the most dominant. © 2017 Elsevier Ltd
  6. Keywords:
  7. Carbides ; Carbon ; Carbon nanotubes ; Cracks ; Field emission microscopes ; Fracture toughness ; Nanocomposites ; Nanotubes ; Processing ; Scanning electron microscopy ; Silicon carbide ; Sintering ; Spark plasma sintering ; X ray diffraction analysis ; Yarn ; Field emission scanning electron microscopy ; Optimum processing conditions ; Optimum processing temperature ; Silicon carbides (SiC) ; Spark plasma sintering method ; Toughening mechanisms ; Vickers indentation method ; X-ray diffraction analyses (XRD) ; Silicon compounds
  8. Source: International Journal of Refractory Metals and Hard Materials ; Volume 71 , February , 2018 , Pages 61-69 ; 02634368 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0263436817305930