Patent ID: 6755239
Filing Date: 2004-06-29
Classification: B22C,B22D,C22C

Abstract:
A method of making cast shapes such as complex shapes with thin walled configurations as well rings, tubes and pipes with smooth or contoured profiles on the outside diameter of titanium base alloys, comprising:a) melting the alloy under vacuum or partial pressure of inert gas; b) pouring the alloy into a central sprue, the central sprue rotating along a vertical axis of the central sprue wherein the melt travels under the action of centrifugal force radially outward through horizontal runners into cavities of molds spinning along the circumference of a circle of rotation and, wherein each mold is made of machined graphite, wherein the graphite has been isostatically or vibrationally molded and has ultra fine isotropic grains between 3-40 micron, a density between 1.65 and 1.9 grams/cc, flexural strength between 5,500 and 20,000 psi, compressive strength between 12,000 and 35,000 psi, and porosity below 15%; and c) solidifying the melted alloy into a solid body taking the shape of the respective mold cavity.