초록 ▼

A rotary seal member, such as a gas turbine engine blade, is provided with an improved surface layer which has an elastic modulus matched with the elastic modulus of a substrate of the member. Also, the surface layer does not form a brittle intermetallic with the substrate at an intended operating t

A rotary seal member, such as a gas turbine engine blade, is provided with an improved surface layer which has an elastic modulus matched with the elastic modulus of a substrate of the member. Also, the surface layer does not form a brittle intermetallic with the substrate at an intended operating temperature. In one form, the surface layer includes abrasive particles adapted to inhibit chemical reaction with the layer material. One specific example is a Ti-alloy substrate having a metallurgically bonded layer based on Nb, and including cubic boron nitride abrasive particles coated with cobalt entrapped in the layer.

대표청구항 ▼

A method for providing a metallic substrate for a member of a rotary seal with an improved metallic surface layer, the substrate having a first elastic modulus, comprising the steps of: selecting a metallic layer material which has: i) a second elastic modulus matched with the first elastic modulus,

A method for providing a metallic substrate for a member of a rotary seal with an improved metallic surface layer, the substrate having a first elastic modulus, comprising the steps of: selecting a metallic layer material which has: i) a second elastic modulus matched with the first elastic modulus, and ii) a solid solubility with the substrate which does not form with the substrate at any time including as-applied as well as at an intended operating temperature in the range of about 500°-1400°F. an intermetallic, as defined by a relative solid solubility and phase relationship between the metallic layer material and the metallic substrate, and which is sufficiently brittle to result in loss of resistance to high cycle fatigue of the metallic substrate at room temperature of greater than about 25% as compared with a base line high cycle fatigue strength for bare substrate; and metallurgically bonding the metallic layer material directly to the substrate.