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http://dx.doi.org/10.4191/KCERS.2008.45.1.815

Characterization of Mechanical Alloying Processed Ti-Si-B Nanocomposite Consolidated by Spark Plasma Sintering  

Lee, Hyung-Bock (Department of Materials Science & Engineering, Myong-Ji University)
Kwon, In-Jong (Department of Materials Science & Engineering, Myong-Ji University)
Lee, Hyung-Jik (Department of Materials Science & Engineering, Kang-Nung University)
Han, Young-Hwan (Department of Chemical Engineering & Materials Science, University of California)
Publication Information
Journal of the Korean Ceramic Society / v.45, no.12, 2008 , pp. 815-820 More about this Journal
Abstract
The microstructure and mechanical properties of $TiB_2/Si$ nanocomposites based on the Ti-Si-B system, consolidated by spark plasma sintering of mechanically alloyed activated nanopowders, have been characterized. Mechanical Alloying was carried out in a planetary ball mill for 180 min with 350 rev $min^{-1}$. The powders were pressed in vacuum at a pressure of 60 MPa, generating a maximum temperature in the graphite mould of $1400^{\circ}C$. Analysis of the synthesized nanocomposites by SEM, XRD and TEM showed them to consist of $TiB_2$ second phase, sub-micron in size, with no third phase. Composites consolidated from powders mechanically alloyed from an initial elemental powder mix of 0.3 mol Si, 0.7 mol Ti, and 2.0 mol B achieved the best relative density (97%) and bending strength (774 MPa); the highest Vickers hardness of 14.7 GPa was achieved for the 0.1-0.9-2.0 mol starting composition.
Keywords
Spark plasma sintering; Mechanical alloying; Ti-Si-B system; Planetary mill; Activated powder; Nanocomposite;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 1
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