Article made of a Ti-Al intermetallic compound, and method for f

Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Post sintering operation

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419 2, 419 26, 419 29, 419 45, 419 46, 419 47, 419 48, 419 49, 419 58, 419 55, B22F 316

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057015759

ABSTRACT:
An article essentially consisting of one or more of Ti--Al intermetallic compounds is fabricated so as to have a volume ratio of voids no more than 3.5%, by preparing a mixture of materials selected from a group consisting of Ti, Ti alloys, Al, Al alloys, and Ti--Al compounds, having a composition suitable for forming a desired Ti--Al intermetallic compound, and heating said mixture so that said mixture may be sintered. Typically, the temperature and pressure for the heating or sintering process is appropriately selected so that the desired porosity may be obtained. The mechanical strength of an article according to the present invention is not only improved but is highly predictable, or, in other word, highly reliable. The fabrication costs can be reduced because the fabrication process involves only relatively low temperatures when pressing and heating the work at the same time. Furthermore, during the process of fabrication, the article may demonstrate a highly favorable workability so that the final shape can be given to the work without involving any undue difficulty.

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