Fabrication of FeAl Intermetallic Foams by Tartaric Acid-Assisted Self-Propagating High-Temperature Synthesis

Abstract

Iron aluminides are intermetallics with interesting applications in porous form thanks to their mechanical and corrosion resistance properties. However, making porous forms of these materials is not easy due to their high melting points. We formed FeAl foams by elemental iron and aluminum powders sintering with tartaric acid additive. Tartaric acid worked as an in situ gas-releasing agent during the self-propagating high-temperature synthesis of FeAl intermetallic alloy, which was confirmed by X-ray diffraction measurements. The porosity of the formed foams was up to 36 ± 4%. In the core of the sample, the average equivalent circle diameter was found to be 47 ± 20 µm, while on the surface, it was 35 ± 16 µm; thus, the spread of the pore size was smaller than reported previously. To investigate functional applications of the formed FeAl foam, the pressure drop of air during penetration of the foam was examined. It was found that increased porosity of the material increased the flow of the air through the metallic foam.

Structure and Selected Properties of Arc Sprayed Coatings Containing In-Situ Fabricated Fe-Al Intermetallic Phases

“…Specific to intermetallic phases is their high electrical resistance at room temperature. The materials owe their peculiar properties to an ordered crystal structure with strong chemical bonds, combined with a dense packing of atoms in space, which results in a reduced diffusion speed and increased resistance to creep, recrystallization and high-temperature corrosion, compared to traditional metal alloys [21][22][23][24][25][26][27][28][29][30]. The main issue that makes the use of Fe-Al coatings more difficult is due to their brittleness in surrounding temperature and the difficulty of shaping ready-made elements to desired dimensions via mechanical machining methods [31][32][33][34][35].…”

In situ synthesis mechanism of ZrC‐ZrB2/Cu composites prepared by SHS‐casting method

“…As shown, both porous and dense microstructures were formed. In general, SHS reaction will release an amount of gas, which led to the occurrence of pores . Subsequently, molten Cu infiltrated into the pores by capillary force.…”

Fabrication of a Porous Fe–Al Intermetallic Alloy with Ultrahigh Open Porosity

“…The open porosity of the porous Fe-Al intermetallic alloy prepared in our work has also increased by %10% with respect to the TE reaction. [21,22] As for contrasting with space holder method [25][26][27]44] (e.g., NaCl and organic compounds as the porogen), the open porosity was increased by %11.12% to %34.96%.…”