SBIR Phase I: Soft Magnetic Nanocomposites for High Frequency Electronic and Electrical Devices

该小型企业创新研究项目将开发用于高频电子和电气设备的软磁纳米复合材料。在高频下操作的AC电子和电气设备需要具有高饱和磁化强度、高初始磁导率和低损耗的软磁芯材料。在应用中使用各种金属和合金，例如Fe、Fe-Si、Fe-Ni坡莫合金、Fe-Co。这些材料具有高饱和磁化强度、低磁导率和高磁导率，但由于这些材料的低电阻率，在高频下损耗非常高。 另一方面，铁氧体由于其高电阻率而具有低损耗，但与软磁金属和合金相比具有较低的饱和磁化强度。 本计画旨在合成一种由铁磁性及铁氧体材料所组成的新型奈米复合材料。 这些新型纳米复合材料将利用廉价且易于扩展的工艺制造。 这些纳米复合材料粉末将被压实到接近理论密度，以生产具有不同形状和尺寸的块状材料。 这些材料的合成，结构和频率相关的磁性能将在第一阶段的研究工作进行评估。 商业上，这些纳米复合材料的主要应用是在高频下操作的交流机器中，例如变压器、发电机、电动机、电感器芯、磁放大器、用于军事和商业卫星、飞机和航天器的功率转换器和电动机驱动器、用于蜂窝手机的可调谐滤波器、用于音频工业中的阻抗加载的加载线圈、等

This Small Business Innovation Research project will develop soft magnetic nanocomposite materials for applications in electronic and electrical devices operating at high frequency. AC electronic and electrical devices operating at high frequencies require soft magnetic core materials that possess high saturation magnetization, high initial permeability, and low loss. Various metals and alloys e.g. Fe, Fe-Si, Fe-Ni Permalloys, Fe-Co are used in applications. These materials have high saturation magnetization, low coercivity and high permeability but because of low resistivity of these materials, the loss is very high at high frequencies. Ferrites on the other hand have low loss because of its high resistivity but have lower saturation magnetization compared to the soft magnetic metals and alloys. This project aims to synthesize a new kind of nanocomposites consisting of some ferromagnetic and ferrite materials. These novel nanocomposites will be manufactured utilizing an inexpensive and easily scalable process. These nanocomposite powders will be compacted to near theoretical densities to produce bulk materials with different shapes and sizes. The synthesis, structure and frequency dependent magnetic properties of these materials will be evaluated in the Phase I research effort. Commercially the principal applications of these nanocomposites are in alternating current machines operating at high frequency e.g. transformers, generators, motors, inductor cores, magnetic amplifiers, power converters and motor drivers for military and commercial satellites, aircrafts and spacecrafts, tunable filters for cellular handset, loading coils for impedance loading in audio industry, etc.