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4594 |
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Wednesday, May 11, 2016, Yellow River Hall 12:00 PM Aviation Industry I |
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Thermal and mechanical properties of novel lanthanum zirconate based thermal barrier coatings |
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Li Li* / Praxair Surface Technologies, Inc, USA Xingye Guo / Indiana University-Purdue University Indianapolis, USA Zhe Lu/ Changwon National University, Republic of Korea James Knapp/ Praxair Surface Technologies Inc, USA Yeon-Gil Jung / Changwon National University, Republic of Korea Jing Zhang/ Indiana University-Purdue University Indianapolis, USA |
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La2Zr2O7 is one of the proposed next generation thermal barrier coating materials with low thermal conductivity and superior high temperature stability. In this study La2Zr2O7 and conventional 8wt% yttria stabilized zirconia (8YSZ) coatings were deposited using plasma spray technique. Single and double-layered coating architectures were designed in the matrix for evaluation. Coatings thermal and mechanical properties were characterized. Thermal cycling and thermal shock tests were implemented using furnace heat treatment and jet engine thermal shock (JETS) tests. Although confirmed with a lower thermal conductivity in this test, La2Zr2O7 coatings present a lower erosion resistance comparing to conventional 8YSZs. The double-layered structures, with a porous La2Zr2O7 coating on top of a porous 8YSZ sublayer coating, have a better thermal shock and thermal cycling performance than either single layer La2Zr2O7 coatings or double-layered structures with a dense 8YSZ sublayer. With new architecture designs of adding buffer layers between the bond coat and the top coat, the thermal cycling performance is further improved. |