Multilayer GZ/YSZ thermal barrier coating from suspension and solution precursor thermal spray |
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Affiliation: | Coatings and Surface Engineering, Faculty of Engineering, University of Nottingham, NG7 2RD, United Kingdom |
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Abstract: | Rare-earth (RE) zirconates, such as gadolinium zirconate (GZ), gained much attraction to be used for the next generation TBC. A double-layer and triple-layer TBC were deposited using the suspension and solution precursor high velocity oxy fuel (HVOF) thermal spray. A dense solution precursor GZ layer was intended to minimise the crack propagation from underneath, thereby inhibiting the CMAS infiltration. In the furnace cycling test, the double- and triple-layer coatings had a comparable cyclic lifetime. For the CMAS test, both the double- and triple-layer coatings were exposed to CMAS at 1250 °C for 30 mins. The CMAS deposits melted and infiltrated both coatings through the dense vertical cracks (DVCs). Interestingly, the GZ reacted with the molten CMAS to form a gadolinium apatite phase (Ca2Gd8(SiO4)6O2) that was detected in the double- and triple-layer TBC. Both the double- and triple-layer TBCs succeeded in reacting with CMAS. |
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Keywords: | Thermal barrier coating Gadolinium Zirconate Yttria stabilised zirconia Solution precursor HVOF Suspension HVOF |
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