The role of Dy doping on cyclic oxidation behavior of Al-Si coating on new Cobalt-based γ/γ′ superalloy
The role of Dy doping on cyclic oxidation behavior of Al-Si coating on new Cobalt-based γ/γ′ superalloy
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DOI：
10.1016/j.corsci.2021.110077
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发表时间：
2021-12
影响因子：
8.3
通讯作者：
K. Feng;Zheng Chen;Meifeng Li;Mingyue Chen;Chungen Zhou
中科院分区：
文献类型：
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作者：
K. Feng;Zheng Chen;Meifeng Li;Mingyue Chen;Chungen Zhou
采用包埋法在γ′强化钴基高温合金表面制备了Al-Si-Dy涂层。通过实验和计算方法研究了涂层在1050℃下的抗循环氧化性能。涂层的循环氧化寿命是Al-Si涂层的1.5倍以上。与Al-Si涂层相比，Al-Si- dy涂层的氧化皮密度更大，附着力更强。Dy的掺杂提高了铝硅包覆样品的抗循环氧化性。涂层具有优异的抗循环氧化性能，其原因在于氧化垢的黏附能增强，而氧化垢的黏附能则是由更强的Dy-O键引起的。
The Al-Si-Dy coating is prepared on the γ′-strengthened cobalt-based superalloys by pack cementation method. Cyclic oxidation resistance of the coating at 1050 ℃ is investigated through experimental and computing methods. The cycle oxidation life of the coating is more than 1.5 times that of Al-Si coating. The oxide scale on Al-Si-Dy coating is denser and has stronger adhesion compared to Al-Si coating. Dy doping improves the cyclic oxidation resistance of Al-Si coated sample. The superior cyclic oxidation resistance of the coating is ascribed to enhanced adhesion energy of oxide scale, which is caused by stronger Dy–O bond.