Cyclic oxidation behavior of Al-Si coating on new γ′-strengthened cobalt-based superalloy: Experimental study and first-principles calculation
Cyclic oxidation behavior of Al-Si coating on new γ′-strengthened cobalt-based superalloy: Experimental study and first-principles calculation
复制标题
新型γ′强化钴基高温合金Al-Si涂层循环氧化行为的实验研究与第一性原理计算
DOI：
10.1016/j.corsci.2021.109422
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发表时间：
2021-03
影响因子：
8.3
通讯作者：
K. Feng;Meifeng Li;Mingyue Chen;Zhen Li;J. Sha;Chungen Zhou
中科院分区：
文献类型：
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作者：
K. Feng;Meifeng Li;Mingyue Chen;Zhen Li;J. Sha;Chungen Zhou
采用包埋法在新型γ′强化钴基高温合金表面制备了Si改性和未Si改性的铝化物涂层。研究了涂层co基高温合金在1050℃下的循环氧化。Al涂层和Al- si涂层在248次循环后的重量变化分别为-4.28 mg/cm2和-3.40 mg/cm2。硅改性有效地提高了铝涂层的抗循环氧化性能。实验研究和第一性原理计算表明，Si的加入促进了Al2O3+ sio2保护膜的形成，降低了氧在涂层中的扩散。
The aluminide coatings with and without Si modification were prepared on the new γ′-strengthened cobalt-based superalloy using a pack cementation method. Cyclic oxidation of the coated Co-based superalloy was study at 1050 °C. The weight changes of Al coating and Al-Si coating were -4.28 mg/cm2after 248 cycles and -3.40 mg/cm2after 346 cycles, respectively. The cyclic oxidation resistance of the Al coating was effectively improved by Si modification. Based on the experimental study and the first-principles calculation, it is suggested that Si addition facilitated the formation of a protective Al2O3+SiO2film and reduced oxygen diffusion in the coating.