Improvement of Magnetic Properties of the Permanent Magnet: Effect of CaO and SiO2 Additives on the Sintered Compact of Sr-Ferrite
Improvement of Magnetic Properties of the Permanent Magnet: Effect of CaO and SiO2 Additives on the Sintered Compact of Sr-Ferrite
复制标题
永磁体磁性能的改善：CaO和SiO2添加剂对Sr-Ferrite烧结体的影响
DOI：
10.2497/jjspm.34.169
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
A. Hamamura
中科院分区：
文献类型：
--
作者：
Y. Kaneko;S. Anamoto;A. Hamamura
研究了CaO和SiO_2添加剂对锶铁氧体烧结体的磁性能、密度和显微组织的影响。结果表明，CaO和SiO_2添加剂在锶铁氧体压坯的烧结过程中起着快速致密化和控制晶粒长大的重要作用。电子探针、显微组织观察和致密化温度依赖关系表明，添加CaO和SiO_2添加剂的锶铁氧体致密化是由沿晶界低熔点的液相促进的。液相为CaO-SiO_2-SRO-6Fe_2O_3三元固溶体。在CaO含量为0.45%、CaO/SiO_2=1.25的条件下，获得了高质量的电烤箱用永磁体(BR=4.4 KG，IHc=2.8 kOe)。
Effects of CaO and SiO2 additives on the magnetic properties, density and microstructures of the sintered compacts of Sr-ferrite were investigated. It was revealed that CaO and SiO2 additives play important roles of rapid densification and grain growth controll through the sintering process of Sr-ferrite compacts. EPMA, microstructure observation and temperature dependence of the densification showed that the densification of Sr-ferrite containing CaO and SiO2 additives was promoted by liquid phase with low melting point along the grain boundaries. The liquid phase was composed of CaO-SiO2-SrO-6Fe2O3 ternary solid solution. Magnetic properties of the sintered Sr-ferrite were strongly dependent on the amount of CaO and SiO2 additives and, in the case of CaO=0.45% and CaO/SiO2=1.25, a high quality permanent magnet (Br=4.4 KG and iHc=2.8 KOe) was obtained for an electronic oven.