Fiber-reinforced yttria partially stabilized zirconia thermal barrier coatings processed by sol-gel method

Abstract

A novel fiber-reinforced 6 wt% yttria partially stabilized zirconia (YPSZ) thermal barrier coating (TBC) has been produced by sol-gel process The coating showed superior high-temperature properties compared with the traditional sol-gel TBCs Hollow Al 2O 3-10 mol% ZrO 2 fibers were used to reinforce the sol-gel TBCs. SEM and XRD results showed that the coatings obtained were dense, uniform and crack-free with the main phase of yttria stabilized t-ZrO 2. High-temperature cyclic oxidation test at 1000°C for 200 h and thermal insulation test were also performed to investigate the oxidation resistance and thermal insulation property of the coating. It revealed that the addition of hollow Al 2O 3-ZrO 2 fibers not only enhanced the mechanical property but also created high porosity in the coatings, which finally improved the oxidation and spallation resistance as well as the thermal insulation of such coatings. Copyright © 2012 De Gruyter.