新型复式连通SiC/390Al复合材料的制备和性能

New-model double-interpenetrating SiC/390Al composite

以空心多孔SiC泡沫陶瓷为增强体,用挤压铸造法制备了新型复式连通双连续相SiC/390Al复合材料,研究了泡沫陶瓷骨架筋的结构对复合材料的影响,以及复合材料中的界面对力学性能的影响.结果表明,SiC空心多孔泡沫陶瓷与390Al复合后形成了复式连通双连续相复合材料,具有独特的互穿式界面结构,材料界面的结合优异.随着复合材料界面结合的加强和泡沫增强体的复合韧化,复合材料的屈服强度、压缩强度和弯曲强度明显提高,韧性显著增强.

The new-model double-interpenetrating SiC/390Al composites reinforced by hollow and porous foam ceramic were fabricated by the squeeze casting method, and the effect of the structures of struts of SiC foam reinforcement on the Sic/390Al composites was investigated. The effect of interface of composites on their mechanical properties was studied. The results show that the structures of struts of SiC foam reinforcement have an important role within the composites. The double-interpenetrating Sic/390Al composite reinforced by the SiC hollow and porous foam ceramic has unique interpenetrating interface, so the composite has the perfect interface bond. Therefore, not only the yield strength, the compressive strength of the double-interpenetrating Sic/390Al composite, but also the toughness and the flexural strength increase much well as the composite has good interface bond, and the struts of SiC foam reinforcement are roughed.