Thermal barrier coatlngs Sol-gel Flbers Cydlc oxldatlon Thermal barrier coatings (TBC) were fabricated with commercial powders of yttria stabilired zirconia with spherical and fiber-like morphologies. The influence of fiber percentage and sintering temperature on the thennomechanical behavior was studied. TBCs with 60%-80% fibers content had the best lifetime in cyclic oxidation with Jess than 10% of coating spallation after 1000 cycles, with very good reproducibility. They reached lifetimes higher than industrial TBCs made by EB-PVD. The enhancement of durability is believed to be due to an increase in the thennomechanical constraints accommodation thanks to higher poroeity and higher tenacity due to the presence of well anchored fibers, indeed deviation of the cracks were observed. Moreover, the morphology of the thermally grown oxide CTGO) layer is also favorable as it includes anchorage points of the TGO with fibers. This increased the adherence at the substrate interface and improved lifetime.
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