Erosion resistance of titania co-doped yttria stabilized zirconia

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Proceedings titleProceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. Volume 5: Manufacturing Materials and Metallurgy; Marine; Microturbines and Small Turbomachinery; Supercritical CO2 Power Cycles
ConferenceASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012, June 11-15, 2012, Copenhagen, Denmark
Pages6169; # of pages: 9
SubjectAbrasive particles; Erosion resistance; Failure mechanism; High-temperature sintering; Impingement angle; Thermal barrier coating (TBCs); Thermal insulation capabilities; Yttria-stabilized zirconias (YSZ); Brittle fracture; Exhibitions; Gas turbines; Hardness; Plasma spraying; Thermal barrier coatings; Thermal conductivity; Titanium dioxide; Yttria stabilized zirconia; Zirconia; Erosion
AbstractThe standard yttria-stabilized zirconia (YSZ) has been used as thermal barrier coatings (TBCs) in the hot sections of gas turbine engines for several decades. To achieve further improvement to the thermal insulation capability of current TBCs, doping of alternative oxides to zirconia or co-doping of oxides to YSZ has been employed. In our previous study, it has been shown that doping of 7YSZ with titania (TiO2) reduces thermal conductivity of 7YSZ substantially. As TBCs are susceptible to various failure mechanisms, in this study the erosion resistance of TiYSZ at high impingement speed and angle is evaluated along with measurements of hardness (H) and elastic modulus (E). Specimens with 5 different TiO2 doping amounts (5%, 7.5%, 10%, 12.5% and 15%) are fabricated using plasma spraying and high temperature sintering. The erosion test results show that sample with 5% TiO2 (5TiYSZ) suffers the most erosion damage at high impingement angle due to brittle fracture while 10-15TiYSZ samples exhibit less brittle erosion damage which leads to lower erosion rates under the same test condition. When comparing the erosion rates (defined as the loss of sample mass per mass unit of abrasive particles) to the hardness values, they were found to follow the same trend. The addition of TiO2 (10-15 wt%) had the effect of reducing the erosion rate of 7YSZ at high impingement angle.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21270869
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Record identifierca28176b-fff8-49f3-87a7-50e6f8c45e9a
Record created2014-02-17
Record modified2016-05-09
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