骨架表面改性对SiC/Al复合材料性能的影响

采用挤压铸造法制备了SiC/Al双连续相复合材料,并对增强体SiC泡沫陶瓷骨架进行了表面改性处理,研究了网络骨架的表面粗化和表面涂覆K2ZrF6对骨架和双连续相SiC/Al复合材料性能的影响.结果表明:随着粗化时间的增加,SiC陶瓷骨架表面的粗化程度增大.粗化时间为12 min时骨架表面粗化最佳,而且保持了骨架的致密结构.SiC陶瓷骨架表面粗化增加了骨架筋的表面积,加强了界面的机械结合;SiC陶瓷骨架表面涂覆K2ZrF6,提高了基体纯铝对SiC陶瓷骨架的润湿,改善了复合材料中增强体与基体间界面的结合,增强了材料的三维连续性,提高了复合材料的力学性能.骨架表面涂覆K2ZrF6的复合材料的界面结合得最好,复合材料的强度最高,为纯铝基体的5倍.

Effect of surface treatment of foam preform on the properties of SiC/Al composites

SiC/Al co-continuous composites were fabricated by the squeeze casting method, the surface of SiC foam was treated by an aqueous solution of NaOH and an aqueous solution of K2ZrF6, and the effects of treatment on the performance of SiC/Al co-continuous composites were investigated. The results show SiC foam got the optimum coarse when they had been treated by an aqueous solution of NaOH for 12 min. The treatment changed the appearance of struts of foam perform and improved the bonding of interface, the continuity of composites, so the mechanical properties of composites were increased. The composites that were treated by K2ZrF6 have the best bonding of interface and the highest strength that is 5 times of pure aluminum matrixes.