Abstract: A method of electrical discharge machining at least one shaped hole in a metallic article using a shape memory alloy electrode is disclosed. The method comprises the steps of processing at least one shape memory alloy wire electrode to retain a trained shape; loading the electrode in an electrical discharge machining device; and electrical discharge machining at least one shaped hole in the article, whereby the hole approximates the trained shape of the electrode.

Abstract: Single crystal superalloy castings are described which have excellent oxidation resistance. The oxidation resistance is due to the presence of small but effective amounts of magnesium in the casting. Single crystal castings containing magnesium in the range of 5-200 parts per million, by weight, are described.

Abstract: An electrode for use in a rotary electrical discharge machining (EDM) device for producing at least one curved hole in an article includes at least one curved tooth. The curved tooth lies in a plane. A perpendicular line to that plane is parallel to the axis of rotation on the rotary EDM device. At least one curved cooling hole is machined in the article.

Abstract: An improved abrasive blade tip for gas turbine engines is taught, wherein an abrasive tip coating is applied to the blade tip in such a manner as to lessen wear through of the abrasive and the underlying airfoil on the leading and trailing edges, by coating the blade tip with abrasive not only on the tip surface per se, but so as to cover portions of the convex and concave airfoil surfaces at the corners where the tip surface intersects the leading and trailing edges.

Abstract: A repair coating for superalloy articles, such as gas turbine engine components, includes a volatile organic carrier or water-based carrier, a fluxing agent, a thickening agent, balance a filler mix. The filler mix consists of at least two distinct particulate components. The mix includes a first particulate component having a composition which approximates that of the article being repaired. The mix also includes a second particulate component having a composition approximating that of the article and a melting point depressant, such as boron. This melting point depressant is substantially in excess of that in the article and sufficient to provide melting of a portion of the mix at a processing temperature below the melting temperature of the article. The above filler mix is blended with the other constituents to form the repair coating which is applied to an article.

Abstract: The flywheel containment device (2) includes a shaft (4), defining an axis of rotation, and a flywheel (6) having an annular shaped cross-section perpendicular to the axis of rotation. The flywheel (6) is connected to the shaft (4) and has an outer diameter (5) and an inner diameter (3). The containment device (2) also comprises an annular shaped honeycomb structure (8) with an annular shaped honeycomb layer (10) having an outer diameter and an inner diameter greater than the outer diameter of the flywheel (6). The honeycomb layer (10) comprises a plurality of pores (11) that are open on the inner diameter of the honeycomb layer (10) to trap dust created if the flywheel (6) fails. The honeycomb layer (10) is positioned around the outer diameter of the flywheel (6) such that the honeycomb structure (8) is independent from the flywheel (6).