就快淬过程中冷却辊材质及保护气体压力对Nd2Fe14B/α-Fe纳米双相永磁合金组织结构和磁性能的影响进行了系统研究.结果表明,降低贴辊面的导热系数有利于提高合金组织的均匀性,用导热系数较低的钼辊取代导热系数较高的铜辊后,合金磁性能显著提高.降低快淬过程中保护气体的压力可以避免快淬条带贴辊面产生气泡,防止粗大晶粒的形成.改进工艺后制备的合金晶粒尺寸细小,分布均匀,硬磁相与软磁相之间的交换耦合作用增强,磁性能水平显著提高.在0.4×105Pa氩气保护下,使用钼辊快淬的Nd10.0Fe83.0Zr1.0B6.0合金,经过适当的晶化处理后最佳磁性能为Br=9.5×10-1T,iHc=10.68×79.6kA/m,(BH)max=17.58×7.96 kJ/m3.
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