Abrasive rotor shaft ceramic coating

摘要

An abrasive coating on a rotor shaft interacts with cantilevered vanes to form an abradable air seal in a turbine engine. The abrasive coating includes a metal bond coat, and an abrasive layer containing a plurality of abrasive grit particles in a ceramic matrix. The grit particles may be selected from cubic boron nitride (CBN), zirconia, alumina, silicon carbide, diamond and mixtures thereof.

主权项

1. An abrasive coating for a rotor shaft, the abrasive coating comprising:
a metal bond coat layer on the rotor shaft; and an abrasive layer overlying the bond layer for contact with vanes during operation of the rotor shaft, the abrasive layer including a plurality of grit particles at least partially embedded in a yttria stabilized zirconia or gadolinia-zirconate matrix and wherein the grit particles are coated with at least one of nickel, MCrAl, MCrAlY and a refractory modified MCrAlY, where M is nickel, iron, cobalt or mixtures thereof, prior to placement in the yttria stabilized zirconia or gadolina-zirconate matrix.