Abradable seals

A sealing element for positioning radially outwardly of the at least some of the aerofoil blades of a gas turbine engine, said sealing element defining a radially inner surface region which radially inner surface region includes an integrally formed seal structure comprising a plurality of inwardly projecting walls wherein the thickness of the walls increases at their radially inner edges.

A method of manufacturing a sealing element for positioning radially outwardly of at least some of the aerofoil blades of a gas turbine engine, the method the including the step of integrally forming in a radially inner surface region of the sealing element a seal structure comprising a plurality of radially inwardly projecting walls, wherein said projecting walls are formed by electro-discharge machining.

A sealing element for positioning radially outwardly of the at least some of the aerofoil blades of a gas turbine engine, said sealing element defining a radially inner surface region which radially inner surface region includes an integrally formed seal structure comprising a plurality of inwardly projecting walls, wherein openings between the walls are at least partially filled with an abradable sealing material and the abradable sealing material protrudes inwardly beyond radially inner edges of the walls.