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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Main Authors Gedevanishvili, Shalva, Deevi, Seetharama C
Format Patent
LanguageEnglish
Published 14.01.2003
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Abstract 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.
AbstractList 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.
Author Deevi, Seetharama C
Gedevanishvili, Shalva
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Title Processing of iron aluminides by pressureless sintering of elemental iron and aluminum
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