Highly densified carbon nanotube reinforced polymer derived ceramics

本计画的目标是借由碳奈米管的强化，来延伸聚合物衍生陶瓷的概念。在一种新的方法中，CNT将在不存在爆炸性烃气氛的情况下从起始陶瓷前体聚合物释放烃的过程中形成;处理将在氩气中进行。PDC的形成将分两步进行：在第一步中，将在过渡金属催化剂的存在下热解预陶瓷聚合物，其将释放的烃转化为CNT。在第二步中，将使用场辅助烧结技术（FAST）烧结所得材料。为了了解子过程的过程参数、微观结构和所得材料性能的背景，对微观结构、机械性能和功能性能进行表征这些新型材料的导电性、导热性将被表征，从碳纳米管含量与增强体之间的相关性出发，初步了解了碳纳米管含量对增强体性能的影响。PDC基体的状态（无定形或结晶）对烧结行为和增强效果的影响将得到发展，并且转移到其他材料系统应该是可能的。此外，具有高断裂韧性的陶瓷材料将是可用的。这种新型陶瓷材料的加工可以在易于控制的加工步骤中实现，并且材料性能可以通过加工参数和通过添加颗粒填料而在宽范围内变化。

Goal of this project is to extend the concept of polymer derived ceramics, PDCs, by the reinforcement with carbon nanotubes, CNTs. In a novel approach the CNTs will be formed during the release of hydrocarbons from the starting preceramic polymer in the absence of an explosive hydrocarbon atmosphere; processing will be carried out in argon. The formation of the PDCs will be carried out in two steps: in the first step a preceramic polymer will be pyrolyzed in the presence of a transition metal catalyst, which converts the releasing hydrocarbons into CNTs. In the second step, the resulting material will be sintered with field-assisted sintering technology (FAST). In order to understand the context of the process parmeters of the sub-processes, the microstructure and the resulting material properties, characterization of the microstructure, the mechanical properties and the functional properties (electric onductivity, heat conductivity) of these novel-type materials will be characterized, and function principals will be derived from th eresults.From the correlation between the CNT content and the resulting reinforcement a basic understanding of the influence of the state of the PDC matrix (amorphous or crystalline) on the sintering behavior and on the reinforcement effect will be developed, and a transfer to other material systems should be possible. Moreover, a ceramic material will be available having a high fracture toughness. The processing of this novel-type ceramic material might be realized in easy-to- control processing steps, and the material properties may be varied in a wide range by the processing parameters and by the addition of particulate fillers.