摘要
应用速凝薄带、氢爆碎技术制备Nd22.8Pr7.8Dy1.6FebalNb0.55Cu0.2Al0.75B1.02烧结磁体。探讨了一步烧结、二步烧结方法对磁体显微组织、磁性能及其温度稳定性的影响。选择合适的烧结工艺制度有利于磁体得到致密、精细、均匀的显微组织,提高磁性能并改善温度稳定性。在本试验条件下,于1338K烧结保持2h,磁体密度达到7.58g/cm3,平均晶粒尺寸为7.4μm,晶粒尺寸分布均匀;其Br、Hcj、(BH)max分别达到1.22T、1753.7kA/m、290.1kJ/m3;当L/D=0.1时,在393K保持2h,其开路磁通不可逆损失仅为0.65%。
Nd22.8Pr7.8Dy1.6FebalNb0.55Cu0.2Al0.75B1.02 sintered magnets were prepared using strip cast alloy and hydrogen decrepitation process. Effects of one-step and two-step sintering methods on the microstructure, magnetic properties and thermal stability of magnets were investigated. The use of reasonable sintering process is a necessary condition for preparing magnets with dense, fine-grained and homogeneous microstructure and hence improved magnetic properties and thermal stability. Under the experimental conditions described in this paper, magnets sintered at 1338K for 2h has a density of 7.58g/cm^3, and an average grain size of 7.4pm and uniform grain size distribution; their Br, Hcj and （BH）max were 1.22T, 1753.7kA/m and 290. lkJ/m^3 respectively; when L/D = 0.1, the irreversible flux loss was only -0.65% after exposure at 393K for 2h.
出处
《磁性材料及器件》
CAS
CSCD
北大核心
2012年第4期25-30,共6页
Journal of Magnetic Materials and Devices
