Karczewski Krzysztof, Stępniowski Wojciech J, Salerno Marco
Department of Advanced Materials and Technologies, Faculty of Advanced Technology and Chemistry, Military University of Technology, Urbanowicza 2 Str., 00-908 Warszawa, Poland.
Department of Materials Science & Engineering, Loewy Institute, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015, USA.
Materials (Basel). 2018 Apr 18;11(4):621. doi: 10.3390/ma11040621.
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.
铁铝化合物是一种金属间化合物，由于其机械性能和耐腐蚀性能，在多孔形式下具有有趣的应用。然而，由于这些材料的熔点很高，制造它们的多孔形式并不容易。我们通过将元素铁和铝粉与酒石酸添加剂烧结来制备FeAl泡沫。酒石酸在FeAl金属间合金的自蔓延高温合成过程中作为原位气体释放剂，这一点通过X射线衍射测量得到了证实。所形成泡沫的孔隙率高达36 ± 4%。在样品的核心部分，发现平均等效圆直径为47 ± 20 µm，而在表面为35 ± 16 µm；因此，孔径的分布比之前报道的要小。为了研究所形成的FeAl泡沫的功能应用，我们检查了泡沫渗透过程中空气的压降。结果发现，材料孔隙率的增加会增加空气通过金属泡沫的流量。
