Phase stability and thermal insulation of YSZ and erbia-yttria co-doped zirconia EB-PVD thermal barrier coating systems

SURFACE & COATINGS TECHNOLOGY

卷:389

Article

Boissonnet, G.¹  Chalk, C.²  Nicholls, J. R.²  Bonnet, G.¹  Pedraza, F.¹ 

[1] Univ La Rochelle, Lab Sci Ingenieur Environm, LaSIE, UMR CNRS 7356, Ave Michel Crepeau, F-17042 La Rochelle 01, France

[2] Cranfield Univ, Surface Engn & Nanotechnol Inst SENTi, Coll Rd, Bedford MK43 0AL, England

关键词: Thermal barrier coatings (TBCs);    Electron-beam physical vapour deposition (EB-PVD);    Yttria stabilized zirconia (YSZ);    Erbia-yttria co-stabilized zirconia (ErYSZ);    Thermal diffusivity;   

DOI  :  10.1016/j.surfcoat.2020.125566

来源: Elsevier

【 摘 要 】

In order to cope with the ever-increasing operating temperature of aero gas turbines, new thermal barrier coatings are being investigated. Among the different solutions, erbia-yttria co-doped zirconia coatings made by electron-beam physical vapour deposition (EB-PVD) show promising results in terms of thermal insulation enhancement. Annealing of these coatings was performed at 1100 degrees C in air in order to investigate their stability in comparison with that of standard 8 wt% yttria-stabilized zirconia (8YSZ). Their thermal transport properties were measured using the laser-flash technique. The results show that the as-deposited co-doped coatings offered lower heat conduction than the standard ones in the studied temperature range (from room temperature to 1100 degrees C). However, the microstructural and phase transformations of the co-doped coatings after annealing were significantly greater than those of the standard coatings, hence strongly modifying their thermal insulation potential.

【 授权许可】

Free