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Coatings 2017, 7(6), 73; doi:10.3390/coatings7060073

Combustion Synthesis of UHTC Composites from Ti–B4C Solid State Reaction with Addition of VIb Transition Metals

Department of Aerospace and Systems Engineering, Feng Chia University, Taichung 40724, Taiwan
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Academic Editors: Cheng Zhang, Arvind Agarwal and Kantesh Balani
Received: 10 May 2017 / Revised: 24 May 2017 / Accepted: 27 May 2017 / Published: 1 June 2017
(This article belongs to the Special Issue Ultrahigh Temperature Ceramic Coatings and Composites)
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Abstract

UHTC composites were prepared by self-propagating high-temperature synthesis (SHS) from the Ti–B4C reaction system with addition of Cr, Mo, and W. The starting sample composition was formulated as (3−x)Ti + B4C + xMe with x = 0.1–1.0 and Me = Cr, Mo, or W. For all samples conducted in this study, self-sustaining combustion was well established and propagated with a distinct reaction front. With no addition of Cr, Mo, or W, solid state combustion of the 3Ti + B4C sample featuring a combustion front temperature (Tc) of 1766 °C and a combustion wave velocity (Vf) of 16.5 mm/s was highly exothermic and produced an in situ composite of 2TiB2 + TiC. When Cr, Mo, or W was adopted to replace a portion of Ti, the reaction exothermicity was lowered, and hence, a significant decrease in Tc (from 1720 to 1390 °C) and Vf (from 16.1 to 3.9 mm/s) was observed. With addition of Cr, Mo, and W, the final products were CrB-, MoB-, and WB-added TiB2–TiC composites. The absence of CrB2, MoB2, and WB2 was attributed partly to the loss of boron from thermal decomposition of B4C and partly to lack of sufficient reaction time inherent to the SHS process. View Full-Text
Keywords: self-propagating high-temperature synthesis (SHS); TiB2–TiC composites; transition metal borides; B4C; VIb transition metals self-propagating high-temperature synthesis (SHS); TiB2–TiC composites; transition metal borides; B4C; VIb transition metals
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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. (CC BY 4.0).

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MDPI and ACS Style

Yeh, C.-L.; Lin, W.-Z. Combustion Synthesis of UHTC Composites from Ti–B4C Solid State Reaction with Addition of VIb Transition Metals. Coatings 2017, 7, 73.

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