Rotary gas seals and turbine and compressor blades.

摘要

A rotary gas seal which comprises a first member including at least one seal tooth having a tip which cooperates with a second member to inhibit gas flow therebetween, the tip being provided with a ceramic or metalic coating bonded thereto, the surface of the coating having a plurality of laser-formed depressions and providing a wear-resistant, cutting surface capable of cutting into the second member. A turbine or compressor blade which comprises a tip surface adapted to co-operate with a sealing surface to form a seal between the blade and the sealing surface and a ceramic or metallic carbide coating bonded to the tip surface, the coating having a plurality of laser-formed depressions and providing a wear-resistant, cutting surface capable of cutting into the sealing surface.