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Thermal Conductivity , Phase Stability , and Oxidation Resistance of Y 3 Al 5 O 12 ( YAG ) / Y 2 O 3 – ZrO 2 ( YSZ ) Thermal-Barrier Coatings
| Content Provider | Semantic Scholar |
|---|---|
| Author | Trice, Rodney W. Faber, Katherine T. Wang, H. Porter, Wallace D. |
| Copyright Year | 2004 |
| Abstract | This paper describes a new multilayer TBC that incorporates a 10 μm-thick oxygen barrier layer of yttrium–aluminum garnet (YAG) into a typical YSZ TBC system. The thermal conductivity of as-sprayed YAG/YSZ coatings was reduced due to excessive porosity and amorphous areas in the YAG layer. After long-term heat treatments, the conductivity of the multilayer was unaffected by the presence of YAG. Sintering and recrystallization of the amorphous YAG regions occurred during high-temperature heat treatments. While YAG itself possesses excellent phase stability, its presence also improved the phase stability of zirconia near the YAG/YSZ interface, inhibiting the outward diffusion of yttrium from high-yttria t-ZrO2 The YAG layer reduced the NiCoCrAlY bond-coat oxidation rate by a factor of three during isothermalfurnace tests conducted at 1200◦C. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://engineering.purdue.edu/MSE/People/Faculty/rtrice/OxidationofMetals.pdf |
| Alternate Webpage(s) | http://www.triceceramics.com/uploads/9/3/8/9/93899770/13_yag_2004.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
