Effect of Al2O3 content on the high-temperature oxidation behaviour of CoCrAlYTa coatings produced by laser-induction hybrid cladding
Effect of Al2O3 content on the high-temperature oxidation behaviour of CoCrAlYTa coatings produced by laser-induction hybrid cladding
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DOI：
10.1016/j.corsci.2022.110739
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发表时间：
2022-10
影响因子：
8.3
通讯作者：
Lei Qin;P. Ren;Yanliang Yi;Tianjin Xie;Yunlong Hu;Dongchu Chen;Shengfeng Zhou
中科院分区：
文献类型：
--
作者：
Lei Qin;P. Ren;Yanliang Yi;Tianjin Xie;Yunlong Hu;Dongchu Chen;Shengfeng Zhou
研究了不同Al2O3含量的激光诱导复合熔覆CoCrAlYTa涂层的显微组织和等温氧化行为。结果表明，在CoCrAlYTa涂层中添加Al2O3颗粒，由于Al的扩散系数增大，降低了Al的临界浓度，促进了连续完整的Al2O3膜的形成。然而，在CoCrAlYTa涂层中的钽氧化物的生长导致周围的氧化皮开裂。有趣的是，由2wt%Al2O3的最佳含量制成的CoCrAlYTa涂层高温氧化后形成的氧化膜具有良好的致密性。
The microstructure and isothermal oxidation behaviour of CoCrAlYTa coatings containing different Al2O3contents produced by laser-induced hybrid cladding (LIHC) were investigated. The results showed that the addition of Al2O3particles to the CoCrAlYTa coatings reduced the critical concentration of Al due to the increased diffusion coefficient of Al, which promoted the formation of continuous and complete Al2O3scales. However, the growth of tantalum oxide in the CoCrAlYTa coating resulted in cracking of the surrounding oxide scales. Interestingly, a CoCrAlYTa coating made of the optimal content of 2 wt% Al2O3formed an oxide scale with good compactness after high-temperature oxidation.