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Toughened carbon nanotube-iron-mullite composites prepared by spark plasma sintering

Abstract : Carbon nanotube-iron mullite nanocomposite powders were prepared by a direct method involing a reduction in H2-CH4 and without any mechanical mixing step. The carbon nanotubes are mostly double-andfew-walled (3-6walls). Some carbon nanofibers are also observed. The materials were consolidated by spark plasmas intering. Their electrical conductivity is 2.4S/cm where as pure mullite is insulating. There is no increase in fracture strength, but the SENB toughness is twice than the one for unreinforced mullite(3.3vs.1.6 MPam½). The mechanisms of carbon nanotube bundle pull out and large-scale crack-bridging have been evidenced.
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Submitted on : Monday, September 23, 2013 - 11:11:23 AM
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Alicia Weibel, Alain Peigney, Geoffroy Chevallier, Claude Estournès, Christophe Laurent. Toughened carbon nanotube-iron-mullite composites prepared by spark plasma sintering. Ceramics International, Elsevier, 2013, vol. 39, pp. 5513-5519. ⟨10.1016/j.ceramint.2012.12.063⟩. ⟨hal-00864749⟩



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