化学共沉淀法制备MnZn铁氧体前驱物微粉及其性能  

Preparation and properties of MnZn ferrite precursor powders by chemical co-precipitation

作　　者：夏井兵[1] 代建清[1] 李国福[1] 胡志刚[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]河北钢铁集团,河北邯郸050000

出　　处：《功能材料》2012年第5期626-629,634,共5页Journal of Functional Materials

基　　金：云南省中青年学术技术带头人后备人才培养项目基金资助项目(2006PY01-09)

摘　　要：首先对Me(Me=Fe2+、Mn2+、Zn2+)在Me-NaOH-H2O体系中的沉淀行为进行了必要的热力学分析,在此基础上,通过化学共沉淀法制备了尖晶石型的MnZn铁氧体前驱物微粉。利用XRD、SEM对前驱物粉料的粒度分布、物相以及表面形貌进行了表征与测试,并结合TG-DSC(热重与差热扫描分析)对前驱物微粉的煅烧温度进行了分析。前驱物微粉的磁性能由振动样品磁强计(VSM)来表征。实验表明Me在Me-NaOH-H2O体系中共沉范围为10.0～10.7。在此pH范围内,配以一定的盐溶液流速及搅拌速度下,可直接制备出具有尖晶石结构的前驱物微粉,并有效地解决了共沉淀制粉中的洗涤困难的问题。前驱物粉的磁性能测试表明,比饱和磁化强度σs≈64.09A.m2/kg,比剩余磁化强度σr≈3.08A.m2/kg,矫顽力Hc≈0.51A/m。According to the latest thermodynamic data, the thermodynamic analysis of different Me ions （Me= Fe2＋ ,Mn2＋ ,Zn2＋） on the system of Me-NaOH-H2O had been carried out. Then, MnZn ferrite precursor powder was prepared by using co-precipitation. Then the precursor was studied by XRD and SEM, and the tempera- ture of calcination is analyzed by TG-DSC. The vibrating sample magnetometer （VSM） was used to investigate the magnetic properties. It shows that the Me ions can co-precipitate in Me-NaOH-H20 system at pH value of 10.0-10. 7. On this basis, the MnZn ferrite precursor powders with spinel structure were obtained directly, which can solve the difficult issue in washing process. The magnetic investigation indicates that the specific saturation magnetization σ the retentive magnetism σr, and coercive force Hc of the precursor power are 64.09, 3.08A m2/kg and 0.51 A/m respectively.

关 键 词：无机非金属材料 热力学分析 锰锌铁氧体 共沉淀法 

分 类 号：TM277[一般工业技术—材料科学与工程]