Pt-Al-Hf/Zr coating and method

摘要

A Pt—Al—Hf/Zr aluminide coating that can be used as a bond coat for TBC and improve TBC spallation life in service at elevated temperatures is provided. The aluminide coating can include a metastable ternary or higher X—Pt/Pd—Ni phase where the phase and other elements in the alloy system are present in a NiAl β phase of the coating. The metastable phase can be present and observable in the as-deposited condition of the bond coating; e.g. in an as-CVD deposited condition of the bond coating.

主权项

1. An aluminide diffusion coating on a substrate wherein the coating includes a non-aluminide X—Pt/Pd—Ni phase, wherein the phase comprises X, which is at least one of Hf and Zr, Pt/Pd, which is at least one of Pt and Pd, and Ni, and wherein the X—Pt/Pd—Ni phase is present as a layer between an outer β (Ni,Pt/Pd)A1 phase region and an inner diffusion zone of the coating, wherein the outer β (Ni,Pt/Pd)A1 phase region and the non-aluminide X—Pt/Pd—Ni phase are disposed outboard of the diffusion zone of the coating.