高导NiZn铁氧体的微波烧结及其性能

Preparation of High-Permeability NiZn Ferrite by Microwave Sintering Technique and Its Properties

采用微波烧结技术,在900～1000℃的低烧结温度下制备具有(Ni0.20Zn0.60Cu0.20)Fe1.98O4的NiZn铁氧体,并研究微波烧结对其显微组织及其性能的影响。研究表明:与传统烧结相比,微波烧结的烧结时间更短、烧结效率更高,其样品具有较高的烧结密度、粗大的晶粒和均匀的晶粒分布。通过使用微波烧结,可在980℃的低烧结温度下获得磁导率高达2000,而比损耗系数(tanδ/μi)仅为8.7×10-6(100kHz)的铁氧体。

(Ni0.20Zn0.60Cu0.20)Fe1.98O4 ferrite was prepared using microwave sintering technique in the sintering temperature range of 900-1000 oC, and the effects of microwave sintering on the microstructures and properties of the sample was also studied. It is found that compared with the conventional sintering, the microwave sintering time is shorter, sintering efficiency is higher, and the microstructure is more uniform, compact and coarser. Using microwave sintering technique, the initial permeability μi of 2000 and the relative loss factor tanδ/μi of 8.7×10-6(100 kHz) is achieved at only 980 oC sintering temperature.