|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Modelling of Kirkendall Pores Formation during the Fabrication and the Ageing of Pt-based Diffusion Coatings on Nickel Base Superalloys
||Daniel Monceau, Pauline Audigié, Clara Desgranges, Aurélie Rouaix Vande-Put
|On-Site Speaker (Planned)
Pt-rich gamma-Ni+gamma prime Ni3Al coating (GGP coatings) can be excellent coatings on nickel base superalloys by improving both oxidation and hot corrosion resistance, with limited rumpling during thermal cycling. Therefore, they are good bond-coatings for TBC systems. Such coatings can be obtained by interdiffusion of a deposited Pt layer with a superalloy. It can be also combined with an aluminization step. Unfortunately, these Pt-rich GGP coatings often include many pores. This paper presents a numerical modelling of the interdiffusion process under chemical potential gradients, including the transport of vacancies. This analysis allows the prediction of the concentration profiles of Ni, Al, Pt, Cr and vacancies V. The composition of the coating and the location of Kirkendall voids can be predicted.