| DOI | Resolve DOI: https://doi.org/10.1115/GT2012-68172 |
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| Author | Search for: O'Brien, Adam; Search for: Huang, Xiao; Search for: Yang, Q.1 |
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| Affiliation | - National Research Council of Canada. Aerospace
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| Format | Text, Article |
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| Conference | ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012, June 11-15, 2012, Copenhagen, Denmark |
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| Subject | Abrasive 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 |
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| Abstract | The 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. |
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| Publication date | 2012 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21270869 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | ca28176b-fff8-49f3-87a7-50e6f8c45e9a |
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| Record created | 2014-02-17 |
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| Record modified | 2020-04-21 |
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