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

这个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。工作在高频下的交流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磁芯材料。各种金属和合金，如Fe， Fe- si, Fe- ni Permalloys， Fe- co在应用中使用。这些材料具有高饱和磁化强度、低矫顽力和高磁导率，但由于这些材料的电阻率低，在高频时损耗非常大。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，其饱和磁化强度较低。本项目旨在合成一种由铁磁性和铁氧体材料组成的新型纳米复合材料。这些新型纳米复合材料将采用廉价且易于扩展的工艺制造。这些纳米复合粉末将被压实到接近理论密度，以生产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中进行评估。这些纳米复合材料在商业上的主要应用是高频交流电机器，如变压器、发电机、电机、电感磁芯、磁放大器、军用和商用卫星、飞机和航天器的功率转换器和电机驱动器、蜂窝手机的可调谐滤波器、音频工业中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.