Table of Contents Author Guidelines Submit a Manuscript
Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 358746, 6 pages
http://dx.doi.org/10.1155/2015/358746
Research Article

Microstructures and Toughening of TiC-TiB2 Ceramic Composites with Cr-Based Alloy Phase Prepared by Combustion Synthesis in High-Gravity Field

1Department of Vehicle and Electrical Engineering, Mechanical Engineering College, Shijiazhuang 050003, China
2China Aerodynamics Research & Development Center, Mianyang 621000, China
3School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

Received 19 September 2014; Revised 27 December 2014; Accepted 31 December 2014

Academic Editor: Hossein Moayedi

Copyright © 2015 Xuegang Huang et al. 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

Micro-nanocrystalline microstructures which are characterized by TiB2 platelets of the average thickness close to or smaller than 1 μm can be achieved in nearly full-density solidified TiC-TiB2 ceramic composites with Cr-based alloy phases by combustion synthesis in ultra-high gravity field of 2500 g. The filler phases in ceramic composites are actually Cr-based alloy with a little solidified solution of Ni atoms and Al atoms. The hardness, flexural strength, and fracture toughness of the materials are 18.5 ± 1.5 GPa, 650 ± 35 MPa, and 16.5 ± 1.5 MPa⋅m0.5, respectively. The improved fracture toughness of TiC-TiB2 ceramic composites results from crack deflection, crack bridging, and pull-out by a large number of fine TiB2 platelets and plastic deformation with some Cr-based alloy phases.