Importance

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Abstract

A sintering process for producing an aluminide by reacting a first powder with a second powder, the first powder comprising M.sub.xAl.sub.y wherein M is Fe, Ni or Ti, x.gtoreq.1, y.gtoreq.1 and x>y or y>x and the second powder comprises pure M or M alloy powder. Iron aluminides such as Fe.sub.3Al, FeAl or alloys thereof can be made by reacting powders of one or more of Fe.sub.3Al, FeAl.sub.3, FeAl.sub.2, Fe.sub.2Al.sub.5 or alloys thereof with pure iron or an iron alloy. Nickel aluminides such as Ni.sub.3Al or NiAl or alloys thereof can be made by reacting powders of one or more of NiAl.sub.3, Ni.sub.2Al.sub.3, Ni.sub.3Al.sub.2, Ni.sub.5Al.sub.3 or alloys thereof with pure Ni or a Ni alloy powder. Titanium aluminides such as Ti.sub.3Al, TiAl or alloys thereof can be made by reacting one or more of TiAl.sub.3, TiAl.sub.2 or alloys thereof with pure Ti or Ti alloy powder. The process provides a more dense product by solid state reaction of an intermediate intermetallic compound with a component of the final aluminide compact. As a result of the process, the final density can be increased to at least 98% of the theoretical density. Products which can be made by the process include worked products such as rolled sheet, extruded shapes such as tube, drawn products such as wire or bar, or molded/forged products such as fuel injection nozzles.

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First Claim