Effect of Microstructure on CMAS Interaction of Axial Suspension and Solution Precursor Plasma Sprayed Thermal Barrier Coatings: YSZ & GZ

Kah Lok Leng, Siddharth Lokachari, Acacio Rincon Romero, Tanvir Hussain

PhD Student

University of Nottingham

University Park,

NG7 2RD Nottingham, United Kingdom

kah.leng@nottingham.ac.uk

+44(0)7949667293

Effect of Microstructure on CMAS Interaction of Axial Suspension and Solution Precursor Plasma Sprayed Thermal Barrier Coatings: YSZ & GZ

In the study, Axial Suspension Plasma Spray (ASPS) was used to produce a range of columnar microstructures from YSZ suspension after an extensive design of experiment study. The mode of CMAS infiltration with the columnar structure as well as the durability in furnace cycling test (FCT) were extensively studied on a range of microstructures. The optimised microstructure was applied to a multi-layer GZ/YSZ system, in which both layers were sprayed from ASPS. In addition to ASPS, a new GZ coating from Axial Solution Precursor Plasma Spray (ASPPS) was developed and deposited on top of the ASPS GZ coating. The dense solution precursor layer was aimed to minimise the gap between columns and improve the CMAS attack. The coatings were all tested in FCT along with a newly developed Burner Rig (BRT) to understand the failure modes. Finally, a generalised framework was proposed to co-relate CMAS and FCT with ASPS and ASPPS columnar structure.