Cap for ceramic blade tip shroud

摘要

A ceramic shroud assembly includes a tip shroud having an outer platform supporting at least one seal tooth, a shroud cap less brittle than the outer platform and including a shroud cap base on the outer platform, and clockwise and counter-clockwise facing clockwise and counter-clockwise contact surfaces located at clockwise and counter-clockwise distal ends respectively of the base. A rotor assembly may include a circumferential row of turbine blades made of a ceramic material and extending radially outwardly from a disk of a turbine rotor. The turbine blades include airfoils having the airfoil tip shrouds and the shroud caps at blade tips. The clockwise and counter-clockwise contact surfaces of circumferentially adjacent ones of the shroud caps contact each other. The shroud and the platform may be made of a ceramic or ceramic matrix composite material and the shroud cap may be made of a metallic material.

主权项

1. A gas turbine engine blade shroud assembly comprising:
a ceramic airfoil tip shroud including a circumferentially extending outer platform, at least one seal tooth supported by and extending radially outwardly away from and circumferentially parallel to the outer platform, a shroud cap supported on the outer platform, the shroud cap being less brittle than the outer platform, the shroud cap including a horizontally or circumferentially extending shroud cap base having horizontally or circumferentially spaced apart clockwise and counter-clockwise distal ends, the at least one seal tooth mounted on and extending radially outwardly away from the shroud cap base, clockwise and counter-clockwise facing clockwise and counter-clockwise contact surfaces located at the clockwise and counter-clockwise distal ends respectively, the clockwise contact surface being aft facing and the counter-clockwise contact surface being forward facing or the clockwise contact surface being forward facing, and the counter-clockwise contact surface being aft facing, and the clockwise and counter-clockwise facing clockwise and counter-clockwise contact surfaces located on horizontally or circumferentially spaced apart clockwise and counter-clockwise side legs at the clockwise and counter-clockwise distal ends respectively of the shroud cap base.