燃烧反应超快升温热压制备碳纳米管/氧化铝复合材料

CNTs reinfoced alumina ceramics prepared by hot pressing technology with ultra-fast heating rate based on combustion reaction

报道一种制备碳纳米管增强氧化铝基复合材料的新方法,用燃烧反应所产生的热量为热源代替传统烧结炉,在燃烧反应完成的同时施加机械压力来实现快速烧结.当碳纳米管掺量为1%(质量分数)时复合材料的断裂韧性同比提高了50%.该方法有利于避免碳纳米管的高温破坏,复合材料的增韧作用主要来自于碳纳米管的拔出效应和桥联机制.

A novel method for producing carbon nanotubes （CNTs） reinforced alumina ceramics was reported. The reaction heat generated by combustion was utilized as a high temperature source, and great mechanical pressure was applied when the combustion reaction was finished. When adding 1% CNTs, the fracture toughness of the composites increased about 50% compared with the pure alumina ceramics prepared in the same conditions. The results indicate that the sintering method is beneficial to protecting the CNTs from destruction. The toughening mechanisms are mainly CNTs pulled-out and CNTs bridging.