Patent ID: 8973808
Filing Date: 2015-03-10
Classification: C23C,F01D,F05D

Abstract:
1. A method for making a cellular seal member for a turbine, comprising, in sequence: forming a diffusion aluminide coating on all surfaces of a cellular seal comprising a plurality of cells and corresponding cell walls to form a coated cellular seal, one of the surfaces comprising a seal brazing surface; and brazing the seal brazing surface of the coated cellular seal to a substrate brazing surface of seal substrate with a braze material comprising a nickel-based, cobalt-based or iron-based superalloy to form a braze joint between the seal brazing surface and the substrate brazing surface, the braze joint comprising a fillet proximate the substrate brazing surface of the substrate between the seal brazing surface of the coated cellular seal and the substrate brazing surface, wetting of the cell walls of the cellular seal by the braze material is limited to the fillet, and transport of the braze material away from the seal brazing surface and fillet to other surfaces of the cellular seal and the formation of brittle phases by the braze material on other surfaces of the coated cellular seal is avoided.