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选择Ti--C--Al和Ti--C--Al--CuO两种体系,采用原位反应近液相线铸造技术,制备铝基复合材料.通过金相显微镜、扫描电镜和X射线衍射仪研究了复合材料的微观组织.对上述两种体系的反应进行了热力学与动力学分析.进一步研究了CuO对Ti--C--Al体系的自蔓延反应过程的作用机理,建立了其反应过程的动力学模型.结果表明:在Ti--C--Al体系自蔓延反应过程中,CuO和Al的反应可以提高其反应体系的绝热温度,能为该体系反应持续提供热量,使其自蔓延效果更为显著,反应更加彻底,大大减少条块状的中间产物Al3Ti,优化了材料组织.
The Ti - C - Al and Ti - C - Al - CuO systems were selected and the in - situ reactive near - liquidus casting technique was used to prepare the aluminum matrix composites. The microstructure of the composites was characterized by optical microscope, scanning electron microscopy and X - ray diffraction The microstructures of the composites were investigated by means of a diffractometer.The thermodynamic and kinetic analyzes of the two systems were carried out.Further studies were made on the mechanism of the CuO self - propagating reaction in the Ti - C - Al system, The results show that the reaction between CuO and Al can increase the adiabatic temperature of the reaction system in the process of self - propagating Ti - C - Al system, Self-propagating effect is more significant, the reaction is more thorough, greatly reducing the bar-like intermediate product Al3Ti, optimizing the material organization.