Sikder, P and Pramanick, A and Sarkar, S and Das, S and Dey, P P and Das, Probal Kumar (2015) Indentation size effect and wear characteristics of spark plasma sintered, hard MWCNT/Al2O3 nanocomposites. Advances in Applied Ceramics, 114 (8). pp. 448-455. ISSN 1743-6753

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Magnesia doped multiwalled carbon nanotube (CNT)/alpha-alumina nanocomposites have been fabricated by spark plasma sintering at 1500 degrees C under 50 MPa in argon. Owing to combined grain refining effect of nanotube and magnesia, nanocomposites possessed smaller matrix grains and extensively lower matrix crystallites than pure alumina. Thermal expansion mismatch between matrix and filler rendered up to four times higher compressive lattice microstrain to the nanocomposites over pure alumina. Despite very low CNT loading (e.g. 0.13 wt-%), nanocomposites offered considerably higher hardness (as high as 24.42 GPa), negligible indentation size effect (Meyer exponent = 1.906-1.941) and enhanced elastic response over pure alumina. Up to 0.27 wt-% nanotube loading, much higher wear resistance was observed for the nanocomposites over pure alumina. The presence of uniformly dispersed and structurally intact nanotubes coupled with lower matrix grains and crystallites having compressive lattice strain were the key factors behind achieving such improved mechanical properties of the present nanocomposites.

Item Type: Article
Subjects: Engineering Materials
Divisions: Non-Oxide Ceramics & Composites
Depositing User: Bidhan Chaudhuri
Date Deposited: 22 Feb 2016 06:26
Last Modified: 22 Feb 2016 06:26

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