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AssigneeNHK Spring Co., Ltd.
InventorsKohei Taguchi, Michihiko Ayada, Hideo Shingu
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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.
An article essentially consisting of one or more of Ti-Al intermetallic compounds, wherein a ratio of the volume of voids existing in said article to the volume of said article is approximately between 1.3% and 3.5%.
An article comprising one or more Ti-Al intermetallic compounds and having a plurality of voids, wherein a ratio of the volume of voids to the volume of said article is approximately between 1.3% and 3.5%, and further wherein said article is formed by heat treatment of a structure having at least a first phase and a second phase, said first phase being distributed like islands in a matrix of said second phase.
An article comprising one or more Ti-Al intermetallic compounds and having a plurality of voids, wherein a ratio of the volume of voids to the volume of said article is approximately between 1.3% and 3.5%, and further wherein said article comprises a lamella structure.
Dependencies are inferred from the claim text.