Synthesis of porous NiAl-Ni3Al alloys for metal supports of solid oxide fuel cells

A. Maznoy, A. Kirdyashkin, V. Kitler, A. Guschin, A. Solovyev, I. Ionov show affiliations and emails
Received: 27 August 2015; Revised: 26 November 2015; Accepted: 21 December 2015
This paper is written in Russian
Citation: A. Maznoy, A. Kirdyashkin, V. Kitler, A. Guschin, A. Solovyev, I. Ionov. Synthesis of porous NiAl-Ni3Al alloys for metal supports of solid oxide fuel cells. Lett. Mater., 2015, 5(4) 491-496
BibTex   https://doi.org/10.22226/2410-3535-2015-4-491-496

Abstract

Synthesis of porous Ni+20%Al alloys with controlled shape of parts and porous structure was investigated. Combustions synthesis in thermal explosion mode under controlled heat losses was used for the sintering. Here thin cylindrical sample, compacted from mixture of nickel and aluminum powders and placed between stainless steel plates, was heated up to a temperature at which occurs an exothermic interaction between the reacting powders. Exothermicity derives from heat of formation of Ni3Al and NiAl phases. During the reaction the released heat sinks to the stainless steel plates, making it possible to preserve an original shape of the synthesized samples. Using stereometric metallography the effect of porosity and thickness of synthesized materials on following structure parameters was investigated: average sizes of frame elements, closed pores and through channels, specific surface and portion of open porosity. A structural particularity of synthesized materials which occurs under thermal gradients during explosion was revealed. Effect of temperature treatment of the synthesized material in an inert environment at 850 ÷ 1250 degrees centigrade on their pore structure, phase composition, permeability and strength was investigated. Porous materials with Ni3Al-NiAl composition, 0.5 ÷ 4 mm thickness, 0.39 ÷ 0,57 porosity, the size of the transport pores of 4.5 ÷ 7 microns was obtained. Conditions under which synthesized materials has optimal properties for use as a support of solid oxide fuel cells were found.

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