Intermetallics: Porous Fe40Al Materials for Self-Lubricating Bearings

Iron aluminides offer an interesting combination of properties such as high abrasion resistance, high temperature strength, low density and cost advantage over the conventional high temperature materials. Successful commercialization of these materials requires the development of processing techniqu...

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Bibliographic Details
Published inEuropean Congress and Exhibition on Powder Metallurgy. European PM Conference Proceedings p. 1
Main Authors Durejko, Tomasz, Lipinski, Stanislaw, Giemza, Boleslaw
Format Conference Proceeding
LanguageEnglish
Published Shrewsbury The European Powder Metallurgy Association 01.01.2010
Subjects
Aluminum
Bearings
Chemical elements
Corrosion resistance
Deformation
Iron alloys
Manufacturing
Powder metallurgy
Sintering
Temperature
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Summary:Iron aluminides offer an interesting combination of properties such as high abrasion resistance, high temperature strength, low density and cost advantage over the conventional high temperature materials. Successful commercialization of these materials requires the development of processing techniques. The cost of manufacturing process is essential part of the total cost of a part, especially for new materials, so there are many trials to introduce unconventional solutions of processing or to modify well known technologies, such as powder metallurgy (PM). Recently, we proposed a PM process termed sintering at cyclic loading, as an alternative fabrication method, by which FeAl intermetallics were produced successfully from elemental powders mixtures. The proposed method made it possible to manufacture FeAl dense or porous sintered materials for several applications. Self-lubricating bearings could be one possible application. The investigations of microstructure, chemical composition and compression strength of Fe40Al porous material are presented in this paper. It was stated that sintered structure (mainly porosity) depends on sintering parameters and amount of porophor. Porosity of 20-40% of final product was obtained. The Fe40Al die consists of FeAl phase and dispersed Al^sub 2^O^sub 3^ oxide distributed along FeAl grains. Compression tests have shown strength values of about 140MPa of Fe40Al sleeves which is comparable to commercial iron sleeves. Density of FeAl material was about 5g/cm^sup 3^ compared to 7g/cm^sup 3^ density of sintered iron material. [PUBLICATION ABSTRACT]