Effect of YSZ-incorporated glass-based composite coating on oxidation behavior of K438G superalloy at 1000 °C
Effect of YSZ-incorporated glass-based composite coating on oxidation behavior of K438G superalloy at 1000 °C
复制标题
DOI：
10.1016/j.jeurceramsoc.2016.10.030
复制
发表时间：
2017-03
影响因子：
5.7
通讯作者：
Xin Wang;Shenglong Zhu;Zi Gu;Minghui Chen;Fu-hui Wang
中科院分区：
文献类型：
--
作者：
Xin Wang;Shenglong Zhu;Zi Gu;Minghui Chen;Fu-hui Wang
在K438G高温合金基底上烧结制备了YSZ颗粒的玻璃基复合涂层。在1000℃时，YSZ的加入提高了材料的抗循环氧化能力，而YSZ与玻璃基体的界面反应则相反。此外，YSZ夹杂物改变了玻璃基体的结晶行为，在循环氧化过程中只有钙长石析出。由于玻璃基涂层的喷砂和密封作用的协同作用，改变了K438G的氧化行为，在基材/涂层界面形成了一层氧化铝而不是铬。此外，由于氧化铝和玻璃基体之间的界面反应，在氧化铝/铝晶界面上形成了一层铝晶界层，从而形成了双层热生长氧化物。因此，氧化铝层被保护免受活性玻璃基体的攻击。因此，涂层的K438G高温合金在1000℃下表现出令人满意的抗氧化性能。
A glass-based composite coating incorporating YSZ particles was prepared by sintering on K438G superalloy substrates. The YSZ additions increased the cyclic oxidation resistance at 1000 °C, while the formation of zircon resulting from interfacial reactions between YSZ and the glass matrix worked reversely. Besides, the YSZ inclusions changed the crystallization behavior of the glass matrix, and only anorthite precipitated during cyclic oxidation. Due to the synergy of sand-blasting and sealing effect of the glass-based coating, the oxidation behavior of K438G was changed and a layer of alumina instead of chromia formed at the substrate/coating interface. Furthermore, a gahnite layer formed at the alumina/gahnite interface because of interfacial reactions between alumina and the glass matrix, leading to the formation of a bi-layered thermally grown oxide. Thus, the alumina layer was protected from the attack of the active glass matrix. Accordingly, the coated K438G superalloy exhibited satisfactory oxidation resistance at 1000 °C.