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运用电场激活压力辅助合成(FAPAS)和原位合成技术制备了TiC-Ni/TAl/Ti功能梯度材料,研究了电场对材料合成及层界面扩散连接的作用。采用光学显微镜、扫描电镜、X射线能谱和X射线衍射仪分析了材料各层及界面的微观组织、相组成和元素分布。结果表明,电场的施加以及TiAl的燃烧反应是合成材料的关键。原位反应合成的TiC颗粒分布均匀、颗粒细小。TiC-Ni/TiAl/Ti功能梯度材料的界面区产生成分的互扩散,并形成了良好的冶金结合。从钛板到金属陶瓷层的显微硬度呈梯度变化。
The TiC-Ni / TAl / Ti functional graded materials were prepared by electric field activated pressure assisted synthesis (FAPAS) and in-situ synthesis, and the effect of electric field on the material synthesis and interface diffusion bonding was investigated. The microstructure, phase composition and elemental distribution of each layer and interface were analyzed by optical microscope, scanning electron microscopy, X-ray energy dispersive spectroscopy and X-ray diffraction. The results show that the application of electric field and the combustion reaction of TiAl are the key to the composite material. The TiC particles synthesized by in-situ reaction are uniform and the particles are fine. Interfacial region of TiC-Ni / TiAl / Ti functionally graded material produces mutual diffusion of the components and forms a good metallurgical bond. The microhardness from titanium plate to the cermet layer shows a gradient.