浸渗法制备ZTA陶瓷/铁基复合材料研究进展

浸渗法制备ZTA陶瓷颗粒增强铁基复合材料的研究取得了很大进展。针对陶瓷预制体制备,铁水对陶瓷预制体的浸渗,陶瓷与铁水的润湿性,复合材料界面结合,复合材料耐磨性等方面的研究进行了论述。解决铁水对预制体的润湿性是实现浸渗的先决条件,常用的方法有在陶瓷预制体中添加活性元素,通过化学镀、气相沉积以及包覆等方法对陶瓷表面进行改性等;在陶瓷与金属基体间形成过渡层可以改善结合界面的组织结构,促进陶瓷与金属基体形成冶金结合;铁水对陶瓷预制体的浸渗机理,以及ZTA陶瓷复合材料的耐磨机理尚需要深入研究。

Research Progress in ZTA Ceramic/Iron Matrix Composites Prepared by Infiltration Method

Great progress has been achieved in the preparation of ZTA(zirconia toughened alumina)ceramic particle reinforced iron matrix composites by infiltration method.The research progress was reviewed for ceramic preform preparation,infiltration of liquid iron into ceramic preform,wettability of ceramic and liquid iron,interfacial bonding of composite materials and wear resistance of composite materials.It is concluded that the wettability of molten iron with the preform is a prerequisite for the realization of infiltration.The common methods include adding active elements to ceramic preform,modifying ceramic surface by electroless plating,vapor deposition and coating,etc.The formation of transition layer between ceramics and metal matrix can improve the structure of interface and promote metallurgical bonding between ceramics and metal matrix.The infiltration mechanism of molten iron into ceramic preforms and the wear resistance mechanism of ZTA ceramic composites need to be further analyzed.