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Detailed Program (Poster)
Detailed Program
Code No. |
ME-P82 |
Name |
Dr. Zhe Lu |
Affiliation |
1School of Materials Science and Engineering |
Title |
Thermal Durability of Thermal Barrier Coatings with Blended Feedstock of Lanthanum Zirconate in cyclic thermal exposure |
File of Abstract |
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Co-author-1 | Prefix | Mr. |
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Country | Korea |
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First name | Sung-Hoon |
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Last name | Jung |
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Affiliation | |
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Co-author-2 | Prefix | Mr. |
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Country | |
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First name | Do-won |
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Last name | Song |
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Affiliation | Hanyang University |
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Department | Department of Energy Engineering |
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Co-author-3 | Prefix | Prof. |
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Country | Korea |
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First name | Yeon-Gil |
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Last name | Jung |
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Affiliation | Changwon National University |
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Department | School of Nano and Advanced Materials Engineering |
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Contents |
Lanthanum zirconate (La2Zr2O7) is very promising material for advanced thermal barrier coating (TBC) application, because it has lower thermal conductivity and greater sintering resistance than yttria-stabilized-zirconia (YSZ). However, TBC system with La2Zr2O7 shows a low thermal durability due to the lower coefficient of thermal expansions compared with that of a bond coat. To improve the thermal durability of La2Zr2O7 based TBCs and to give both thermal and mechanical properties to TBCs, microstructure was designed with blended feedstock powders which were consisted of La2Zr2O7 and YSZ with different volume ratios (50:50 and 25:75). Layered microstructure with a buffer layer was deposited by air plasma spray method, and then thermal durability of each TBC was evaluated through the cyclic furnace thermal fatigue (CFTF) and flame thermal fatigue (FTF) tests. The TBC with the buffer layer showed improved thermal durability than single layered TBC in the both cycling thermal exposure tests. The relationship between microstructure design and thermal durability is extensively discussed based on the thermomechanical properties and microstructural evolution during cyclic thermal exposure. |
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