The scaling behavior and mechanism of Ti2AlC MAX phase coatings in air and pure water vapor

Preparation of TiC/Ti2AlC coating on carbon fiber and investigation of the oxidation resistance properties

“…In contrast to the sample oxidized in static air, no evident oxide film could be observed in the sample oxidized in water vapor flow at 600°C. This fact is similar to the oxidation behavior of Ti 2 AlC in water vapor flow reported by Feng et al . The presence of water vapor can facilitate the inward diffusion of Al atoms, which is not favorable for the formation of continuous Al 2 O 3 film.…”

“…They found that the oxide in water vapor flow exhibits poor crystallization than that in dry air. The poor crystallization of the oxide is attributed to their rapid diffusivity in the presence of water vapor but the low grain growth rate at a relatively low temperature, which is not favorable for the formation of highly crystallized oxide . After oxidation at 800°C, the peak corresponding to Ti 2 AlC almost disappeared and a weak peak of TiO 2 appeared, which is attributed to the accelerated oxidation rate of Ti and the grain growth rate of TiO 2 .…”

“…The poor crystallization of the oxide is attributed to their rapid diffusivity in the presence of water vapor but the low grain growth rate at a relatively low temperature, which is not favorable for the formation of highly crystallized oxide. 52 After oxidation at 800°C, the peak corresponding to Ti 2 AlC almost disappeared and a weak peak of TiO 2 appeared, which is attributed to the accelerated oxidation rate of Ti and the grain growth rate of TiO 2 . Al 2 O 3 is still not detected as the accelerated oxidation rate and diffusivity at a higher temperature is not favorable for the formation of highly crystallized Al 2 O 3 .…”

Oxidation and Corrosion Behavior of Nanolaminated MAX‐Phase Ti2AlC Film Synthesized by High‐Power Impulse Magnetron Sputtering and Annealing

“…Frodelius et al obtained the MAX-phase Ti 2 AlC through cosputtering the MAX-phase Ti 2 AlC and the Ti target, the Ti target was added to balance the excess of the C [33]. More recently, Feng et al obtained the MAX-phase Ti 2 AlC from the Ti 50 Al 50 target in Ar/CH 4 atmosphere with CH 4 as the reactive gas at room temperature and annealing at 800 ∘ C and investigated the oxidation behaviors of the MAX-phase films [34]. However, the mechanism for the superior oxidation and corrosion properties of MAX-phase Ti 2 AlC films still needed to be further investigated.…”

Recent Progress and Prospects of Ternary Layered Carbides/Nitrides MAX Phases and Their Derived Two-Dimensional Nanolaminates MXenes

“…MXene 的原子排布(c) [8] Fig. 3 A schematic [35][36] 。值得关注的是, MAX 相材料近年来被 认为是下一代事故容错和燃料包壳涂层的优选材 料。前期大量高能离子模拟辐照和中子辐照研究均显 示 MAX 相材料表现出良好的耐辐照损伤性能 [37][38][39] 。 研究表明, Ti 3 SiC 2 、Ti 3 AlC 2 和 Ti 2 AlC 等 MAX 相的 中子辐照活性与 SiC 材料接近, 比 Alloy 617 型镍基 合金低 3 个数量级 [40][41] 。目前美国能源部和欧盟能源 署均对 MAX 相材料的核能应用给予了足够的重视。 在 MAX 相功能应用方面, 研究工作者对 MAX 相作为摩擦磨损器件 [42] 、电触头器件 [43] 和复合材料 增强相 [44] 等多方面的应用都进行了探索, 并取得了 较好的研究成果。 MAX 相结构特点决定了 A 位原子 能在 M n+1 X n 亚层提供的二维限域平面内发挥出自身 的功能特性。 2017 年, Per Eklund 等 [7] [9] Fig. 4 HR- [50][51][52][53] , 这里就不再赘述。 需要指出的 是 MXene 具有极佳的电磁屏蔽性能, 如 2016 年 Koo 和 Gogotsi 等 [20]…”