Graphene NanoPlatelets reinforced tantalum carbide consolidated by spark plasma sintering

Published on Oct 10, 2013in Materials Science and Engineering A-structural Materials Properties Microstructure and Processing4.652
· DOI :10.1016/J.MSEA.2013.06.006
Andy Nieto15
Estimated H-index: 15
(FIU: Florida International University),
Debrupa Lahiri35
Estimated H-index: 35
(FIU: Florida International University),
Arvind Agarwal51
Estimated H-index: 51
(FIU: Florida International University)
Sources
Abstract
Abstract Graphene NanoPlatelets (GNP) reinforced tantalum carbide composites are synthesized by spark plasma sintering (SPS) at processing conditions of 1850 °C and 80–100 MPa. The GNP addition enhances the densification of TaC–GNP composites to 99% theoretical density, while reducing the grain size by over 60% through grain wrapping mechanism. Survival and structure retention of GNP is confirmed through scanning electron microscopy and micro-Raman spectroscopy. Nanoindentation and high load (20–30 N) microindentation are utilized to evaluate elastic modulus and hardness. GNP improves fracture toughness of TaC by up to 99% through toughening mechanisms such as GNP bending, sheet sliding, cracking bridging, and crack deflection.
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