US-Egypt Cooperative Research: Nano-Sized Copper/Alumina Composites

该奖项支持佛罗里达大学盖恩斯维尔分校材料科学与工程系的Reza Abbaschian博士和埃及赫尔万的中央冶金研究开发研究所(CMRDI)的Sayed F.Moustafa博士的联合研究项目。他们计划利用两种新的粉末制备方法来制备纳米级的铜-氧化铝复合材料，即铜包覆氧化铝粉末和机械化学法制备的铜-氧化铝复合粉末。粉末将被冷压，然后使用传统的粉末冶金技术进行烧结。将上述方法制备的铜-氧化铝复合材料与传统粉末冶金工艺制备的铜-氧化铝复合材料进行比较。预计新的涂层技术将比传统技术制备的复合材料具有更好的导热性和电导性，更好的颗粒/基体界面结合，更高的硬度和高温强度。将复合材料的物理力学性能与工艺参数进行关联，为复合材料的制造提供科学依据。开发的复合材料可用于散热器、焊条、轴承和高温导电材料。范围：某些应用要求具有高导热系数和高高温强度的材料，如点焊电极、缝焊轮、导体和电气开关。目前用于此类应用的铜基合金表现出过度的蠕变和较低的高温强度。一般来说，铜基陶瓷复合材料，特别是铜-氧化铝复合材料是潜在的替代品。如果加工得当，这种复合材料可以提供优异的高温强度，而不会牺牲合金的其他吸引人的性能。该项目涉及多学科的基础和应用研究工作，两个团队共同致力于开发具有所需性能的纳米氧化铝颗粒增强铜基复合材料的加工新技术。该项目将有助于将复合材料制造的科学技术介绍给美国和埃及的行业，并在两国教育学生和培训科学家。这两个组织过去曾在微观结构表征领域对学生和科学家进行培训和教育，本项目将把这种合作扩展到粉末和复合材料加工领域。

0316453AbbaschianDescription: This award supports a joint research project between Dr. Reza Abbaschian, Department of Materials Sciences and Engineering, University of Florida, Gainesville, Florida and Dr. Sayed F. Moustafa, Central Metallurgical Research and Development Institute (CMRDI), Helwan, Egypt. They plan to investigate producing nano-sized copper-alumina composites by using two novel methods of powders preparations, namely, Cu-coated alumina powders, and Cu-alumina composites powders produced by mechano-chemical method. The powders will be cold pressed and then sintered using conventional powder metallurgy techniques. The copper-alumina composites produced by the above mentioned methods will be compared to those produced by conventional powder metallurgy techniques. It is expected that the novel coating techniques will lead to better thermal and electrical conductivities, better particle/matrix interface adhesion, higher stiffness, and high temperature strength than the composites produced by the conventional technique. The physical and mechanical properties of the composites will be correlated with the processing parameters in order to provide a science base for their manufacturing. The developed composites can be used for heat sink applications, welding electrodes, bearing and high temperature electrically conducting materials.Scope: Materials with high thermal conductivity and high elevated-temperature strength have been required for certain applications such as spot welding electrodes, seam welding wheels, conductors, and electrical switches. Copper based-alloys that are currently used for such applications, exhibit excessive creep and low high-temperature strength. Copper-based ceramic composites in general, and copper - alumina composites in particular, are potential alternatives. The composites, if properly processed, can provide excellent high-temperature strength without sacrificing other attractive properties of the alloys. This project involves multidisciplinary fundamental and applied research efforts where the two teams collectively contribute to developing a new technique for processing of nano-sized alumina particulate reinforced copper matrix composites with desired properties. The project will help introduce the science and technology of composites' fabrication to US and Egyptian industries as well as educating students and training scientists in both countries. The two organizations have had collaboration in the past in areas of training and education of students and scientists in microstructural characterization area, and this project will extend that collaboration to areas of powder and composite processing.