Preparation and thermal shock resistance of Ba(Mg1/3Ta2/3)O3 thermal barrier coatings
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Beijing Institute of Technology,Beijing Institute of Technology,Beijing Institute of Technology,Beijing Institute of Technology
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Abstract:
Ceramic powder Ba(Mg1/3Ta2/3)O3 (BMT) was synthesized by the way of solid-phase synthesis method with the raw materials powder of BaCO3、MgO、Ta2O5. BMT/YSZ coatings were prepared by atmospheric plasma spraying (APS). The phase composition and microstructure of the BMT powder and coatings were analyzed by XRD, SEM and optical microscope. The thermal shock resistance was evaluated by water quenching. The results show that the BMT powder with perovskite structure can be synthesized at 1450 ℃ for 4 h. The BMT powder reveals desirable phase stability. The BMT/YSZ coatings have a compact microstructure and higher binding strength between every coating. Spallation was observed within the BMT coatings after 9 cycle thermal shock testing from 1150 ℃to room temperature. Low fracture toughness of BMT and the precipitation of Ba3Ta5O15 phase are the main reason for failure of BMT/YSZ coatings.
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[Cao Yupeng, Wang Quansheng, Liu Yanbo, Shao Yating. Preparation and thermal shock resistance of Ba(Mg1/3Ta2/3)O3 thermal barrier coatings[J]. Rare Metal Materials and Engineering,2018,47(S1):164~168.] DOI：[doi]