METHOD OF PROTECTING A COMPONENT OF A TURBOMACHINE FROM LIQUID DROPLETS EROSION, COMPONENT AND TURBOMACHINE

摘要

The method of protecting a component of a turbomachine from liquid droplets erosion provides covering at least one region of a component surface exposed to a flow of a fluid containing a liquid phase to be processed by the turbomachine with a protective layer; the protective layer consists of a plurality of adjacent sub-layers of different materials having high hardness in the range of 1000-3000 HV and low fracture toughness below 20 MPam1/2; the materials are typically nitrides or carbides of titanium or aluminum or chromium or tungsten; advantageously, the covering is carried out by a PVD technique, in particular by Cathodic Arc PVD, or a CVD technique. The method may be applied to any component of turbomachines, but it is particularly advantageous for parts of centrifugal compressors.