ROTOR WITH ZIRCONIA-TOUGHENED ALUMINA COATING

摘要

A gas turbine engine includes a rotor (60) that has a rim (62), blades (64) extending radially outwards from the rim, a hub (66) extending radially inwards from the rim, and a coating (70) disposed on a portion of the rotor. The coating is zirconia-toughened alumina in which the alumina is a matrix with grains of the zirconia dispersed there through. The grains of zirconia are predominantly a tetragonal crystal structure. The portion of the rotor that has the coating may be selected from the group consisting of an arm (68) extending axially from the rim, a knife edge seal (180) on the rotor, or a spacer (290) of the rotor. The coating may be disposed on the radially outer surface of the arm.