机械合金化结合微波烧结制备钡铁氧体的研究

采用机械合金化结合微波烧结制备钡铁氧体,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)和振动样品磁强计(VSM)对钡铁氧体制备过程的组织和性能进行分析。结果表明:在高能球磨初期,颗粒粒径减小,粉体得到细化,随球磨时间延长,部分BaCO₃固溶于Fe₂O₃中形成固溶体;高能球磨40 h的物料,经900℃微波烧结,烧结材料组织均匀,晶粒得到充分生长,有明显的六角结构生成,比饱和磁化强度为53.7 Am²/kg,矫顽力为447058.4 A/m;相比于传统烧结,微波烧结制备的钡铁氧体磁性能与之相近,但烧结温度降低了100℃,且样品的颗粒大小更均匀,烧结时间更短。

Study on preparation of Barium Ferrite by Mechanical Alloying combined with Microwave Sintering

The barium ferrite was prepared via mechanical alloying combined with microwave sintering,and the organization and properties of the barium ferrite preparation process were characterized by X-ray diffractometer(XRD),scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and vibrating sample magnetometer(VSM),respectively.The experiment results show that:at the beginning of high-energy ball milling,the particle size decreases and the powder is refined;with the extension of the ball milling time,part of BaCO₃ solid solution is formed in Fe₂O₃;the material with 40 h of high-energy ball milling is sintered by microwave sintering at 900℃,the sintered material is uniformly organized,the grains are fully grown,there is obvious hexagonal structure generated,the saturation magnetization intensity is 53.7 Am²/kg,the coercivity is 447058.4 A/m;compared with conventional sintering,the magnetic properties of barium ferrite prepared by microwave sintering are similar,but the sintering temperature is reduced by 100℃,and the particle size of the sample is more uniform and the sintering time is shorter.