Processing, Structure and Property Interrelationships for Laminated Matrix Composites

9632823 Lackey拟议研究的目标是研究一类新型陶瓷基复合材料的工艺、结构和性能之间的相互关系。这些新复合材料由增强相和由两种不同材料交替的薄层组成的基质组成。众所周知，层状结构可以增强机械韧性，因此，它们作为基体与增强相一起使用，应该会增强整个复合材料的韧性。这个为期3年的项目包括复合材料的加工、表征和力学建模。研究了几种层状复合材料体系的工艺-结构-性能之间的相互关系。感兴趣的纤维有碳、碳化硅和氧化铝。基质材料将选自碳、碳化硅、氮化硅、氧化铝、莫来石、B13C2、Nb和Re。根据头两年的结果，将在第三年选择首选系统进行详细研究和优化。我们建议确定优化这种新型复合材料的机械性能，特别是断裂韧性和强度所需的层厚度和材料性能(热膨胀、弹性模数和强度)。%本研究的目的是研究一类新型陶瓷基复合材料的工艺、结构和性能之间的相互关系。这些新复合材料由增强相和由两种不同材料交替的薄层组成的基质组成。众所周知，层状结构可以增强机械韧性，因此，它们作为基体与增强相一起使用，应该会增强整个复合材料的韧性。陶瓷基复合材料性能的提高将对许多商业和国防系统产生很大的影响。***

9632823 Lackey The objective of the proposed research is to study the interrelationships between the processing, structure, and properties of a new class of ceramic matrix composites. These new composites consist of a reinforcement phase plus a matrix composed of alternate thin layers of two different materials. Layered structures are known to enhance mechanical toughness, and thus, their use as the matrix, along with the reinforcement phase, should enhance the toughness of the overall composite. The 3 year project consists of composite processing, characterization, and mechanics modeling. The process-structure-property interrelationships for several laminated matrix composite systems will be studied. Fibers of interest are carbon, SiC, and Al2O3. Matrix materials will be selected from carbon, SiC, Si3N4, Al2O3, mullite, B13C2, Nb, and Re. Based on the results from the first two years, a preferred system will be selected for detailed study and optimization in the third year. We propose to identify the layer thicknesses and material properties (thermal expansion, elastic modulus, and strength) required to optimize the mechanical performance, particularly fracture toughness and strength, of this new class of composites. %%% The objective of the proposed research is to study the interrelationships between the processing, structure, and properties of a new class of ceramic matrix composites. These new composites consist of a reinforcement phase plus a matrix composed of alternate thin layers of two different materials. Layered structures are known to enhance mechanical toughness, and thus, their use as the matrix, along with the reinforcement phase, should enhance the toughness of the overall composite. Improvement of the properties of ceramic matrix composites will have a large impact on many commercial and defense systems. ***