Centrifugal casting of titanium alloys with improved surface quality, structural integrity and mechanical properties in isotropic graphite molds under vacuum
First Claim
1. A centrifugal casting apparatus for casting metal products comprising,a central sprue for rotating along a vertical axis of the central sprue, isotropic graphite molds which have cavities, horizontal runners for passing a melt there through under the action of centrifugal force radially outward into the cavities of the molds spinning along a circumference of a circle of rotation, and means for rotating the isotropic graphite molds.
1 Assignment
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Accused Products
Abstract
Methods for making various titanium base alloys and titanium aluminides into engineering components such as rings, tubes and pipes by melting of the alloys in a vacuum or under a low partial pressure of inert gas and subsequent centrifugal casting of the melt in the graphite molds rotating along its own axis under vacuum or low partial pressure of inert gas are provided, the molds having been fabricated by machining high density, high strength ultrafine grained isotropic graphite, wherein the graphite has been made by isostatic pressing or vibrational molding, the said molds either revolving around its own horizontal or vertical axis or centrifuging around a vertical axis of rotation.
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Citations
7 Claims
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1. A centrifugal casting apparatus for casting metal products comprising,
a central sprue for rotating along a vertical axis of the central sprue, isotropic graphite molds which have cavities, horizontal runners for passing a melt there through under the action of centrifugal force radially outward into the cavities of the molds spinning along a circumference of a circle of rotation, and means for rotating the isotropic graphite molds.
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6. A centrifugal casting apparatus for casting metal products comprising,
a central sprue for rotating along a vertical axis of the central sprue, isotropic graphite molds which have cavities, horizontal runners for passing a melt there through under the action of centrifugal force radially outward into the cavities of the molds spinning along a circumference of a circle of rotation, and means for rotating the isotropic graphite molds and means for disassembling the mold under vacuum and ejecting the casting from the mold cavity when the casting has solidified to a temperature which is below the solidus temperature of the alloy and yet lies within less than 200 C below solidus temperature.
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7. A centrifugal casting apparatus for casting metal products comprising, an isotropic graphite mold having a cavity, and means for rotating the isotropic graphite mold, wherein a coating of either hafnium carbide or tungsten or rhenium is deposited on the surface of the cavity.
Specification