Process for Obtaining Y-Tial Pieces by Casting
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United States of America Patent
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Issued Date -
Nov 22, 2007
app pub date -
Sep 10, 2004
filing date -
Sep 12, 2003
priority date (Note) -
Abandoned
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Abstract
The present invention concerns the development of a process for obtaining .gamma.-TiAl castings, with a maximum thickness of 20 mm, starting from melting charges constituted by commercially pure Ti and Al. In this process the metallic charge is induction melted in a ZrO.sub.2 ceramic crucible inside coated with Y.sub.2O.sub.3, the pouring being performed by centrifugation in ZrO.sub.2 moulds, with an Y.sub.2O.sub.3 contact coating, obtained by the lost wax moulding process. The whole sequence of operations is accomplished under argon atmosphere. The use of this process, besides avoiding the use of previously melted charges needing very specific furnaces, allows to obtain parts with homogeneous chemical composition and very low contamination with residual elements, without surface oxidation, with a hardness quite uniform from the surface to the inside of castings, which reveal a surface finishing identical to that recommended by the international standards for steel castings obtained by the same moulding process.
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