首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Mechanical properties and thermal cycling behavior of Ta2O5 doped La2Ce2O7 thermal barrier coatings prepared by atmospheric plasma spraying
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Mechanical properties and thermal cycling behavior of Ta2O5 doped La2Ce2O7 thermal barrier coatings prepared by atmospheric plasma spraying

机译:Ta2O5掺杂La2O7热阻挡涂层的机械性能和热循环行为通过大气等离子喷涂制备的热阻涂层

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摘要

La2Ce2O2 (LC) is drawing increasing attention to be a new candidate material for thermal barrier coatings (TBCs) because of its higher phase stability, lower thermal conductivity and larger thermal expansion coefficient (TEC) than the traditional yttria partially-stabilized zirconia (YSZ). Unfortunately, the sudden TEC decrease at low temperatures greatly limits its application. In this study, Ta2O5 was added into LC to produce lanthanum-cerium-tantalum-oxide (LCT) solid solution, and LCT coatings were also newly developed by atmospheric plasma spraying (APS) using La2Ce1.7Ta0.3O7.15 powder. LCT coating exhibits excellent thermal stability between room temperature and 1573 K (up to 1000 h). The sudden TEC decrease is effectively suppressed due to the reduced oxygen vacancy concentration resulted from partial Ce4+ substitution by higher valence Ta5+, which is confirmed by Raman spectroscopy. Thermal cycling results showed that LCT TBC has relatively better thermal shock resistance than LC TBC, and spallation failure occurred within the ceramic top coat near the bond coat. It is considered that TEC mismatch stresses, low fracture toughness and coating composition deviation are primarily responsible for the poor thermal cycling performance. These findings provide valuable data for future technical optimization. (C) 2019 Elsevier B.V. All rights reserved.
机译:LA2CE2O2(LC)由于其较高的相位稳定性,较低的导热性和较大的热膨胀系数(TEC),对热阻挡涂层(TBCS)的新候选材料提高了一种用于热阻挡涂层(TBC)的新候选材料,而不是传统的ytTRIA部分稳定的氧化锆(YSZ) 。不幸的是,突然的TEC在低温下降极大限制了其应用。在该研究中,将Ta2O5加入LC中以产生镧 - 甘钽 - 氧化物(LCT)固溶体,并且使用La2CE1.7TA0.307.15粉末通过大气等离子体喷涂(AP)新开发LCT涂层。 LCT涂层在室温和1573k(高达1000h)之间具有出色的热稳定性。由于通过高价值TA5 +从而通过拉曼光谱证实,由于部分CE4 +取代引起的氧气空位浓度降低,因此有效地抑制了突然的TEC减少。热循环结果表明,LCT TBC具有比LC TBC相对较好的热抗震性,并且在粘合涂层附近的陶瓷顶部涂层内发生散发失效。认为TEC不匹配应力,低断裂韧性和涂料组成偏差主要负责差的热循环性能。这些调查结果为未来的技术优化提供了有价值的数据。 (c)2019 Elsevier B.v.保留所有权利。

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