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Advances in Materials Science and Engineering
Volume 2015, Article ID 510356, 8 pages
http://dx.doi.org/10.1155/2015/510356
Research Article

Dynamic Fracture Toughness of TaC/CNTs/SiC CMCs Prepared by Spark Plasma Sintering

Department of Mechanical Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA

Received 11 September 2015; Revised 14 November 2015; Accepted 19 November 2015

Academic Editor: Fernando Lusquiños

Copyright © 2015 Qiaoyun Xie and Sylvanus N. Wosu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study focuses on the fracture toughness of TaC and carbon nanotubes (CNTs) reinforced SiC ceramic matrix composites (CMCs), prepared by spark plasma sintering (SPS) technique. A high densification of 98.4% was achieved under the sintering parameter of 133°C/min, 1800°C, and 90 MPa pressure. Vickers indentation was employed to measure the indentation toughness on the polished surface of ceramic samples, SEM was applied to directly observe the crack propagation after indentation, and split Hopkinson pressure bar (SHPB) was developed to determine the dynamic fracture toughness within the ceramic samples subjected to an impact in a three-point bending configuration.