Processing and Characterization of Porous Ti₂AlC Using Space Holder Technique

Abstract:

Ti₂AlC is one of the most promising MAX phase materials due to its combination of properties at high temperatures (> 800 °C) such as high strength, good oxidation and corrosion resistances, low thermal expansion, readily machinable, high thermal conductivity and nonsusceptibility to thermal shock. Porous structures based on Ti₂AlC are excellent candidates for diverse applications such as heat exchangers and filters, although more systematic studies are required to implement this material. In this work, porous Ti₂AlC material was obtained using a low cost and eco-friendly process, the space holder technique. Commercial Ti₂AlC powder was mixed with different contents (30, 50 and 70 vol.%) of ammonium hydrogen bicarbonate (NH₄HCO₃) as space holder. Afterwards, the obtained powder was uniaxially pressed, followed by elimination of space holder by a heat treatment at low temperature. Finally, porous Ti₂AlC structures were consolidated at 1350 °C under argon atmosphere. Processing, final microstructure and pore characterization of the consolidated materials are described in detail.

• Periodical: Key Engineering Materials (Volume 704)
• Pages: 197-203
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.704.197
• Online since: August 2016
• Authors: Jesus Gonzalez-Julian*, Martin Bram
• Keywords: MAX Phase, Micro-Porosity, Porous Structures, Space Holder Technique, Ti₂AlC

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