Wear resistant, abrasive laser-engraved ceramic or metallic carbide surfaces for rotary labyrinth seal members

Abstract From the Canadian patent

A rotary gas seal in which a first member e.g. a, tip, cooperates with a second member to inhibit gas flow therebetween, the improvement wherein, the tip is provided with a ceramic or metallic coating bonded thereto the, surface of said coating having a plurality of laser-formed depressions and providing a wear-resistant cutting surface, capable of cutting into said second member. Also a turbine, or compressor blade having a tip surface adapted to cooperate with a sealing surface to form a seal between said blade and said sealing surface and a ceramic or metallic carbide coating bonded to said tip surface, said coating having a plurality of laser-formed depressions and providing a …