Temperature and load dependent mechanical properties of pressureless sintered carbon nanotube/alumina nanocomposites
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Temperature and load dependent mechanical properties of pressureless sintered carbon nanotube/alumina nanocomposites
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| Creator |
Sarkar, Soumya
Das, Probal Kumar |
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| Subject |
Engineering Materials
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| Description |
Multiwalled carbon nanotube (MWCNT)/alumina (Al2O3) nanocomposites having different CNT contents have been fabricated by wet-mixing and pressureless sintering in Argon at 1700 degrees C. Depending on indentation load, the highest improvement of 15-34% in hardness was achieved in 0.3 vol.% MWCNT/Al2O3 nanocomposite. Indentation size effect (Mayer's exponent = 1.753) on hardness was the most prominent in 1.2 vol.% MWCNT/Al2O3 nanocomposite due to presence of clustered CNTs, non-uniform interface and porous microstructure. similar to 34% increase in fracture toughness was achieved in 0.3 vol.% MWCNT/Al2O3 nanocomposite than pure Al2O3 (similar to 3.84 MPa m(0.5)). High MWCNT loaded nanocomposites had reduced R-curve sensitivity because of increased matrix grain refining effect and reduced matrix compressive residual stress. High temperature flexural strength results indicated that strength retention of nanocomposites up to 1100 degrees C in ambient was much better compared to pure Al2O3. To predict structure-property relationship in nanocomposites, detailed microstructural and fractographic studies were also performed. (C) 2011 Elsevier B.V. All rights reserved.
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| Publisher |
Elsevier
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| Date |
2012-01
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/1475/1/soumya'12.pdf
Sarkar, Soumya and Das, Probal Kumar (2012) Temperature and load dependent mechanical properties of pressureless sintered carbon nanotube/alumina nanocomposites. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 531. pp. 61-69. ISSN 0921-5093 |
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| Relation |
http://cgcri.csircentral.net/1475/
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