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Journal of Nanomaterials
Volume 2013 (2013), Article ID 504631, 8 pages
http://dx.doi.org/10.1155/2013/504631
Research Article

Formation Behavior of Continuous Graded Composition in Ti-ZrO2 Functionally Graded Materials Fabricated by Mixed-Powder Pouring Method

Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Received 21 February 2013; Accepted 23 April 2013

Academic Editor: Lianjun Wang

Copyright © 2013 Murali Jayachandran 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

A mixed-powder pouring method has been proposed to fabricate functionally graded materials (FGMs) with the desired compositional gradient. The experimental procedure involves preparation of mixed powders consisting of more than two types of particles with different size and/or density, which exhibit different velocities in suspension and sedimentation to form the green body under gravity conditions. The green body was sintered by a spark plasma sintering (SPS) method. The initiation of the particle settlement was precisely controlled by using crushed ice as the suspension medium. Ti-ZrO2 FGMs were fabricated, in this study, using different sizes of ZrO2 and Ti particles. Vickers hardness confirmed the compositional gradient in the fabricated FGMs. A numerical simulation was also carried out to analyze the particle movement inside the suspension medium during the formation process and predict compositional gradient in the FGMs.