Oxidation of Metals ( IF 2.1 ) Pub Date : 2021-07-21 , DOI: 10.1007/s11085-021-10072-5 Wonchul Yang 1 , Kwangsu Choi 1, 2 , Chansik Choi 1 , Joon Sik Park 1
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This paper aims to improve the oxidation resistance of MoNbTaVW (at%) refractory high-entropy alloys after flame tests at 1350 ℃ with Si/Al pack cementation coatings. After the Si/Al pack cementation coatings were applied, a coating layer of about 80 μm with a sequence of Si-rich layer (silicide)/interdiffusion layer/Al-rich layer (aluminide)/Al diffusion layer was formed. After the flame tests at 1350 °C for 20 min, the uncoated specimens formed composite oxides of Nb2O5 (s), Ta2O5 (s), and V2O5 (s) with porosity of MoO3 (g) and WO3 (g) with a weight gain. On the other hand, the Si/Al coated specimens were composed of Si-rich layer (silicide)/interdiffusion layer/Al-rich layer (aluminide)/Al diffusion layer. After the flame tests, SiO2 and Al2O3 ceramic protective layers were formed on the surface and prevented additional oxidation. The oxidation behaviors of MoNbTaVW alloys and the Si/Al pack cementation coated alloys were discussed with microstructures and phase development.
Graphic Abstract
中文翻译：
高温火焰试验下具有同步 Si/Al 填料胶结涂层的难熔 MoNbTaVW 高熵合金的降解性能
本文旨在提高 MoNbTaVW (at%) 难熔高熵合金在 1350 ℃ 火焰试验后使用 Si/Al 填充胶结涂层的抗氧化性。在施加Si/Al填充胶结涂层后，形成约80μm的具有富Si层（硅化物）/互扩散层/富Al层（铝化物）/Al扩散层的涂层。在 1350 °C 下进行 20 分钟的火焰测试后，未涂层试样形成了 Nb 2 O 5 (s)、Ta 2 O 5 (s) 和 V 2 O 5 (s) 的复合氧化物，孔隙率为 MoO 3 (g ) 和 WO 3(g) 体重增加。另一方面，Si/Al 涂层试样由富硅层（硅化物）/相互扩散层/富铝层（铝化物）/铝扩散层组成。火焰测试后，在表面形成了SiO 2和Al 2 O 3陶瓷保护层，防止了额外的氧化。讨论了 MoNbTaVW 合金和 Si/Al 填充渗碳涂层合金的氧化行为，并结合微观结构和相发展进行了讨论。
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