软磁磁芯的制备与性能研究.docVIP

PAGE PAGE 2 软磁磁芯的制备与性能研究 摘 要 因此近年来宽频电子技术越来越受到重视，软磁磁芯能够将电机的电能转化为磁场能并集中到工作区域。软磁体的固有特性决定了电机的工作性能：软磁体在工作频率下饱和磁感应强度决定了电机的最大工作扭矩和输出功率；软磁体的复数磁导率影响电机的输出特性和损耗特性，其实部影响电机的工作磁通决定了其输出特性，而虚部决定于磁滞特性和电阻（涡流损耗），影响电机的损耗特性。这就要求其中软磁铁芯特别是应用在电感应器件及变压器器件上具有优质的高频磁特性。现如今如何开发新一代的软磁性复合材料是目前科研人员的挑战，SMCs不仅在低频范围内具有较低的磁滞损耗而且在高频范围内仍然体现出较低的涡流损耗，并将粉末冶金的优势进一步体现出来，从而制备出所追求的“三高”性能的磁性材料广泛应用于需要新型SMCs的领域。 本毕设针对上述现有问题提出了一系列制备“三高”性能的软磁复合材料的方法和手段：基于放电等离子烧结技术(SPS烧结)通过溶胶-凝胶法制备纳米级别镍锌铁氧体分别均匀包覆在微米级别(30-45um)非晶粉末及较小的微米级别(3-5um)羰基铁粉上，将两种包覆完成粉体按照一定比例混合使得较小的铁粉能够填充在非晶粉的周围，这种做法是因为若铁氧体无法均匀包覆后可以由较小颗粒粒度的铁粉进行填充，而后进行烧结制备，制备一种高致密的微胞金属/金属/陶瓷软磁性复合材料。通过实验后期性能检测发现在300MPa，432℃烧结条件下制备出具有优良软磁性能的多组分软磁复合材料，在1KHz条件下其磁导率达到3965，损耗仅为173.4W/kg,矫顽力为225.8A/m，饱和磁感应强度为1.404T。 关键词：溶胶-凝胶 放电等离子烧结 Fe基非晶软磁复合材料 绝缘包覆 磁性能 PAGE PAGE 2 Abstract Therefore, in recent years, broadband electronic technology has received more and more attention. The soft magnetic core can convert the electrical energy of the motor into magnetic energy and concentrate it in the working area. The inherent characteristics of the soft magnet determine the working performance of the motor: the saturation magnetic induction strength of the soft magnet determines the maximum working torque and output power of the motor at the operating frequency; the complex magnetic permeability of the soft magnet affects the output characteristics and loss characteristics of the motor. The working flux that affects the motor determines its output characteristics, while the imaginary part is determined by the hysteresis characteristics and resistance (eddy current loss), which affects the loss characteristics of the motor. This requires high-quality magnetic properties of the soft magnetic core, especially for electrical induction devices and transformer devices. How to develop a new generation of soft magnetic composite materials is now a challenge for researchers. SMCs not only have low hysteresis loss in the low frequency range, but also exhibit low eddy current loss in the h