Chromium carbide - coated articles are methods and layers to produce to produce a nickel base age hardenable alloy coating

摘要

PURPOSE: To develop effective coating effective for corrosive wear caused by the collision of particles at low angles with turbomachine gas passage parts as the object of the development. ;CONSTITUTION: The surface of parts are thermally sprayed (by an explosive gun, plasma spraying or the like) with the powdery composition of chromium carbide (Cr₃C₂, Cr₇C₃ and Cr₂₃C₆) and an age hardening nickel base alloy (representative example is inconel 718). It is more effective that the adhering coating is heated to bring about the precipitation of intermetallic compounds on the inside of the nickel base alloy components. Chromium carbide provides good corrosion resistance, and the age hardening nickel base alloy provides resistances to thermal and mechanical stresses to the coating and particularly contributes to the corrosive wear resistance of the coating caused by the corrision of particles at low angles. As the representative example of the turbomachines, turbines are given, and as the representative examples of the gas passage parts, blades, vanes, duct parts, nozzle blocks and diaphragms are given.;COPYRIGHT: (C)1992,JPO