Authors: Osendi, M.I.; Gautheron, F.; Miranzo, P.; Belmonte, M.

Source: Journal of Nanoscience and Nanotechnology, Volume 9, Number 10, October 2009 , pp. 6188-6194(7)

Publisher: American Scientific Publishers

Abstract:

Silicon nitride (Si₃N₄) materials with 1.8 and 5.3 vol.% of multi-walled carbon nanotubes (MWCNTs) were densified using 7 wt% of sintering additives (Y₂O₃+Al₂O₃). The mixing and sintering procedures produced quite homogenous and dense MWCNT/Si₃N₄ composites. The nanotubes condition was followed by micro-Raman spectroscopy and no alteration was observed in spite of the relatively high sintering temperatures (∼1600 °C). Mechanical parameters (hardness, elastic modulus and fracture toughness) of the composites and comparative blank specimens were measured by instrumented indentation and discussed in parallel. Thermal conductivity was also estimated for these specimens. The nanotube orientation effect inherent to pressure assisted sintering methods and the weak interfacial bond between nanotubes and Si₃N₄ are important factors to explain the mechanical and thermal behaviours of these composites.

Keywords: SI3N4; CNT; SPS; SI3N4 COMPOSITES

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2009.1556

Publication date: 2009-10-01

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