Abradable liner

摘要

A seal is provided between first and second relatively movable members. The seal comprises a liner attached to the first relatively movable member which liner is abraded by the second relatively movable member. The abradable liner comprises a metallic, open porous structure formed by fusing a metallic feedstock with an energy beam to build up sequential deposits of the fused feedstock.

主权项

1. A seal between a first member and a second member, the first member being stationary in use and the second member being movable relative to the first member in use, the seal comprising a liner attached to the first member, the liner being abraded by the second member, the abradable liner comprising a metallic, open porous structure having a plurality of sub-layers of various pore size,
wherein the plurality of sub-layers includes an outer laver, a mid-layer and an inner layer, and:
the outer layer is adjacent the second member in use and has a smaller pore size than the inner layer and the mid-layer,the mid-layer is between the inner layer and the outer layer and has a larger pore size than the inner layer and the outer layer, andthe inner layer joins the mid-layer to the first member, the inner layer having a pore size between that of the outer layer and the mid-layer.