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Performance of Dy2Zr2O7 Thermal Barrier Coating in Thermal-Shock Test
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Performance of Dy2Zr2O7 Thermal Barrier Coating in Thermal-Shock Test
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    摘要:

    通過大氣等離子噴涂（APS）制備了一種基于鋯酸鏑（Dy2Zr2O7）的新型熱障涂層，該涂層具有更低的熱導(dǎo)率及與鎳基高溫合金更匹配的熱膨脹系數(shù)。對涂層的結(jié)構(gòu)、相組成以及抗熱震性能進(jìn)行了研究。此外，對涂層在熱震循環(huán)過程中的失效過程進(jìn)行了討論。結(jié)果表明，在6~8次熱震循環(huán)后，涂層從基體表面脫落。陶瓷層中的微裂紋在熱震過程中生長并導(dǎo)致粘結(jié)層界面附近的陶瓷層被壓碎，從而最終導(dǎo)致陶瓷層的脫落。

    Abstract:

    A new thermal barrier coating system based on Dy2Zr2O7, which had a lower thermal conductivity and closer thermal expansion coefficient to nickel-based superalloys, was prepared by the air plasma spraying (APS). The microstructure, phase composition and thermal-shock resistance of the as-sprayed coatings were studied. Besides, the failure process of the coating during thermal cycles was also discussed. After 6~8 thermal-shock cycles, coatings spalled from the specimens. Micro cracks in the top coat grew and crushed the ceramic top coat in the vicinity of bond coat interface into pieces, and then led to the spallation of the top coat.

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曹 玄,馬 壯,柳彥博,杜 仲,鄭康楠. Performance of Dy2Zr2O7 Thermal Barrier Coating in Thermal-Shock Test[J].稀有金屬材料與工程,2013,42(6):1134~1138.[Cao Xuan, Ma Zhuang, Liu Yanbo, Du Zhong, Zheng Kangnan. Performance of Dy2Zr2O7 Thermal Barrier Coating in Thermal-Shock Test[J]. Rare Metal Materials and Engineering,2013,42(6):1134~1138.]
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  • 收稿日期:2012-06-25
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