Improved resistance of lanthanum zirconate coatings to calcium-magnesium-alumina-silicate corrosion through composition tailoring

Improved resistance of lanthanum zirconate coatings to calcium-magnesium-alumina-silicate corrosion through composition tailoring
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通过成分调整提高锆酸镧涂层的耐钙-镁-铝-硅酸盐腐蚀能力

DOI:
10.1016/j.ceramint.2018.04.239
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发表时间:
2018-08
影响因子:
5.2
通讯作者:
Liu Bin
Liu Bin
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhu Changhua;Liu Yuchen;Wang Duojin;Zhou Yanchun;Yang Guang;Chen Hongfei;Gao Yanfeng;Liu Bin

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钙镁铝硅酸盐(CMAS)的耐腐蚀性是下一代热电池涂层设计的一个重要问题。锆酸镧涂层作为一种很有前途的热障涂层,一直受到人们的关注。本文研究了三种不同La/Zr组成的锆酸镧涂层,采用激光增强化学气相沉积法制备了La1.8Zr2.2O7.1、La 2 Zr 2 O 7和La2.5Zr1.5O6.75三种陶瓷材料,研究了它们在1250 °C下的抗CMAS腐蚀性能。其中,La2.5Zr1.5O6.75表现出最好的CMAS耐蚀性,这是因为La含量的增加有利于形成致密连续的磷灰石Ca 2La 8(SiO 4)6 O2层,有效减缓了后续熔融CMAS的渗透。本研究阐明了稀土对CMAS耐腐蚀性的重要作用,并有望通过成分定制指导未来的稀土基热电池涂层设计。
Calcium–magnesium–alumina–silicate (CMAS) corrosion resistance is an important issue on the design of next-generation thermal battier coatings. As one of the promising thermal battier coatings, the lanthanum zirconate coating has attracted continuous attention. In this work, three lanthanum zirconate coatings with different La/Zr composition, i.e., La1.8Zr2.2O7.1, La2Zr2O7, and La2.5Zr1.5O6.75, are fabricated by laser-enhanced chemical vapour deposition, and their resistance to CMAS corrosion at 1250 °C is investigated. Among them, La2.5Zr1.5O6.75shows the best CMAS corrosion resistance because increased La content is beneficial to the formation of a dense and continuous apatite Ca2La8(SiO4)6O2layer, which effectively slows down the subsequent molten CMAS penetration. This study clarifies the significant role of rare earth on CMAS corrosion resistance and is expected to guide the future design of rare-earth-based thermal battier coatings through composition tailoring.
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