Composites by Metallurgy and Combustion Synthesis

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Chemical Processes and Systems".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 457

Special Issue Editor


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Guest Editor
Department of Aerospace and Systems Engineering, Feng Chia University, Taichung City 407102, Taiwan
Interests: combustion synthesis; self-propagating high-temperature synthesis (SHS); ceramics; intermetallics; metallothermic reduction; rocket propulsion

Special Issue Information

Dear Colleagues,

Powder metallurgy (PM) and combustion synthesis (CS) have become attractive fabrication routes for the preparation of a wide range of different composite materials. When compared to other melting methods, powder metallurgy techniques are highly suitable for the fabrication of composite materials with uniform distribution of reinforcements in the matrix. Combustion synthesis takes advantage of highly exothermic reactions and is efficient and economical in terms of time, energy, and cost. Combustion synthesis can be accomplished in two different modes: self-propagating high-temperature synthesis (SHS) and the thermal explosion mode (i.e., volume combustion). The SHS technique has been recognized as a promising alternative to conventional methods of preparing advanced materials, including carbides, borides, nitrides, silicides, intermetallics, carbonitrides, composites, complex oxides, etc. Moreover, several modified SHS methods have been developed, including field-activated combustion synthesis (FACS), microwave-activated combustion synthesis (MACS), and catalytically assisted combustion synthesis.

This Special Issue on “Composites by Metallurgy and Combustion Synthesis” aims to cover recent advances in the preparation of composites via powder metallurgy and combustion synthesis. The available topics include, but are not limited to, methods and/or applications in the following areas: the improvement and optimization of related synthesis and processing techniques, ceramic composite processing, metal–ceramic composite processing, intermetallic composite processing, oxide-based composite materials, physical/mechanical property characterization, experimental validation, and other relevant phenomena. Full papers, short communications, and reviews are all welcome.

Prof. Dr. Chun-Liang Yeh
Guest Editor

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Keywords

  • combustion synthesis
  • powder metallurgy
  • ceramic composites
  • metal–ceramic composites
  • intermetallic composites
  • oxide-based composites
  • kinetics of synthesis
  • properties of composites

Published Papers (1 paper)

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Research

13 pages, 7230 KiB  
Article
Effects of Ti/Al Ratio on Formation of Ti-Al Intermetallics/TiB2 Composites by SHS from Ti-Al-B Powder Mixtures
by Chun-Liang Yeh and Yi-Cheng Chan
Processes 2024, 12(6), 1237; https://doi.org/10.3390/pr12061237 - 16 Jun 2024
Viewed by 305
Abstract
Ti-Al intermetallics/TiB2 composites were prepared from elemental powder mixtures by the method of self-propagating high-temperature synthesis (SHS). Reactant mixtures were formulated to contain two parts; one group was (2Ti + 4B) to form 2TiB2 and the other group was (Ti + [...] Read more.
Ti-Al intermetallics/TiB2 composites were prepared from elemental powder mixtures by the method of self-propagating high-temperature synthesis (SHS). Reactant mixtures were formulated to contain two parts; one group was (2Ti + 4B) to form 2TiB2 and the other group was (Ti + xAl) to produce Ti-Al intermetallic compounds. The content of Al ranged between x = 0.33 and 3.0, which was equivalent to the Ti/Al atomic ratio from Ti-25% Al to Ti-75% Al in the (Ti + xAl) group. The results showed that the increase of Al percentage reduced the overall combustion exothermicity and led to a slower self-sustaining combustion wave speed and a lower combustion temperature. Apparent activation energy of the Ti-Al-B solid-state combustion reaction was determined to be 114.7 kJ/mol by this study. Based on the XRD analysis, Ti-Al intermetallics/TiB2 composites featuring Ti3Al, TiAl, TiAl2, and TiAl3 as the dominant aluminide phase were respectively synthesized from the samples of Ti-25%~40% Al, Ti-50%~60% Al, Ti-71.4% Al, and Ti-75% Al. For the samples of Ti-25% Al and Ti-30% Al, Ti3Al was the only aluminide formed. The microstructure of the composites exhibited that TiB2 grains with a columnar shape of 2‒3 μm in length were well distributed and embedded in the aluminide matrix. This study demonstrated an effective and energy-saving fabrication route for producing Ti-Al intermetallics/TiB2 composites with different dominant aluminide phases. Full article
(This article belongs to the Special Issue Composites by Metallurgy and Combustion Synthesis)
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