Novel Low-Cost 3-D Continuously Reinforced Metal Matrix Composites

9361110谢尔曼在这一第一阶段计划中，UltraMet建议研究一种创新的新型材料，这种材料应在保持高温机械性能的同时，显著提高强度、弹性系数和耐磨性。该概念利用化学气相沉积(CVD)制备的泡沫陶瓷作为由互穿、连续的金属和陶瓷相组成的金属基复合材料的高强度互连三维连续增强体，充分利用了每一相的理想性能，同时克服了每一相的固有缺点，如陶瓷的低温脆性和金属的高温蠕变和磨损。该研究涵盖了泡沫陶瓷增强铝基金属基复合材料的建模、制备、表征和测试，为进一步的研究和开发奠定了基础。将研究材料组成、增强结构和体积分数以及加工(熔融渗透)条件对微观结构的影响，以及弯曲、拉伸和加工(熔融渗透)条件对这些独特复合材料的微观结构和弯曲、拉伸和冲击性能的影响。有限的设计信息，如物理性能、机械性能(强度和模数)，以及热疲劳和抗热震性，也将生成。

9361110 Sherman In this Phase I program, Ultramet proposes to investigate an innovative new class of materials which should provide dramatically increased strength, modulus, and wear resistance while maintaining mechanical properties to high temperature. The proposed concept utilizes ceramic foams, fabricated by chemical vapor deposition (CVD), as high-strength interconnected three-dimensional continuos reinforcements for metal matrix composites consisting of interpenetrating, continuous metal and ceramic phases, taking full advantage of the desirable properties of each phase while eliminating the inherent drawbacks of each phase, such as low temperature brittleness in ceramics and high temperature creep and wear in metals. The proposed investigation covers the modeling, fabrication, characterization, and testing of ceramic foam-reinforced aluminum-based metal matrices and provides the groundwork for further investigation and development. The effect of material compositions, reinforcement structure and volume fraction, and processing (melt infiltration) conditions on the microstructure and flexure, tensile, and processing (melt infiltration) conditions on the microstructure and flexure, tensile, and impact properties of these unique composites will be investigated. Limited design information, such as physical properties, mechanical properties (strength and modulus), and thermal fatigue and thermal shock resistance, will be generated as well.