Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 9, Issue 10, Pages 6188-6194Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2009.1556
Keywords
Si3N4; CNT; SPS; Si3N4 Composites
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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 (similar to 1600 degrees 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.
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