The Interface Structure of High-Temperature Oxidation– Resistant Aluminum-Based Coatings on Titanium Billet Surface
The Interface Structure of High-Temperature Oxidation– Resistant Aluminum-Based Coatings on Titanium Billet Surface
复制标题
钛坯表面抗高温氧化铝基涂层的界面结构
DOI：
10.1007/s11837-017-2505-5
复制
发表时间：
2017
期刊：
影响因子：
2.6
通讯作者：
Zhaolin Zhan
中科院分区：
文献类型：
--
作者：
ZHEFENG XU;Xiaohua Yu;Zhaolin Zhan
采用冷喷涂法在钛坯表面制备了一种新型的铝基高温抗氧化涂层。通过光学显微镜分析了暴露表面的微观结构，通过场发射扫描电子显微镜分析了涂层的微观结构和元素扩散，并通过X射线衍射确定了界面相。用Thermo-calc计算了Ti-Al二元相图和稳定相的吉布斯自由能。结果表明，在1050°C下氧化8 h后，可获得50 μ m厚的抗氧化涂层。涂层处理后在钛基基体上形成了两层：Al 2 O3氧化层和TiAl 3过渡层。表面上的大而脆的Al 2 O3颗粒在热处理后可以容易地从表面剥落，保护衬底在处理期间免受氧化。热力学计算结果与实验数据吻合较好。
A new type of high-temperature oxidation-resistant aluminum-based coating, on a titanium billet surface, was fabricated by the cold spray method, at a high temperature of 1050°C, for 8 h, under atmospheric pressure. The microstructure of the exposed surface was analyzed via optical microscopy, the microstructure of the coating and elemental diffusion was analyzed via field emission scanning electron microscopy, and the interfacial phases were identified via x-ray diffraction. The Ti–Al binary phase diagram and Gibbs free energy of the stable phase were calculated by Thermo-calc. The results revealed that good oxidation resistant 50-μm-thick coatings were successfully obtained after 8 h at 1050°C. Two layers were obtained after the coating process: an Al2O3oxidation layer and a TiAl3transition layer on the Ti-based substrate. The large and brittle Al2O3grains on the surface, which can be easily spalled off from the surface after thermal processing, protected the substrate against oxidation during processing. In addition, the thermodynamic calculation results were in good agreement with the experimental data.