Method for electron beam applying leader free coating

摘要

The present invention is directed to methods for applying metallic coating by EBPVD wherein the coatings are either leader free ones or have leaders that can be easily eliminated by thermal treatment at moderate temperature. Three-dimensional region is shown in the space of such co-ordinates: substrate temperature (Tdep), ingot feed rate (Ving) and deposition rate (Vdep), from which the conditions of ingot evaporation and vapor flux deposition are selected. Selecting said parameters within said three-dimensional region provides reproducing evaporated material composition in applied coating and obtaining leader free coating. The deposition conditions presented are specifically for applying coatings of the type commonly used in gas turbine applications.