Processing of iron aluminides by pressureless sintering of elemental iron and aluminum

The invention relates to improvements in powder processing of intermetallic materials such as iron aluminides. A pressureless sintering process for producing FeAl wherein the heating rate is controlled in a manner which minimizes expansion of a mixture of elemental powders of iron and aluminum. Duri...

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Bibliographic Details
Main Authors Gedevanishvili, Shalva, Deevi, Seetharama C
Format Patent
LanguageEnglish
Published 14.01.2003
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Summary:The invention relates to improvements in powder processing of intermetallic materials such as iron aluminides. A pressureless sintering process for producing FeAl wherein the heating rate is controlled in a manner which minimizes expansion of a mixture of elemental powders of iron and aluminum. During the process, the heating rate is maintained below 1° C./min to minimize the volume expansion during the formation of the intermediate phase FeAl. As a result of the process, the final density can be increased up to 95% of the theoretical density. The sequence of phases formed during the heating of Fe+Al mixture were identified by X-ray diffraction, optical microscopy, SEM and along with DSC data were correlated to the expansion and shrinkage behavior of the samples.