Effect of niobium on thermal stability and impact toughness of Nd-Fe-B magnets with ultra-high intrinsic coercivity

• Published in: Journal of rare earths Vol. 29; no. 3; pp. 243 - 246
• Main Author: 胡志华 刘国军 王会杰
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2011; Department of Materials Engineering,Hubei University of Automotive Technology,Shiyan 442002,China%Division of Functional Materials,Central Iron & Steel Research Institute,Beijing 100081,China
• Subjects: Ferrous alloys; Impact strength; impact toughness; Magnetic materials; magnetic properties; Magnets; Niobium; Rare earth metals; rare earths; sintered Nd-Fe-B magnets; Sintering; Thermal stability; ultra-high intrinsic coercivity; 冲击韧性; 微观结构; 超细颗粒; 高热稳定性; 高矫顽力; magnetic properties; sintered Nd-Fe-B magnets; ultra-high intrinsic coercivity; impact toughness; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60439-5

The effects of Nb on the thermal stability and impact toughness of ultra-high intrinsic coercivity of Nd-Fe-B magnets were investigated.The results showed that the addition of Nb could improve the thermal stability,and obviously increased the impact toughness of sintered Nd-Fe-B magnets.The optimum thermal stability of sintered Nd-Fe-B magnets was obtained when the content of Nb was 1.0 at.%.The maximum impact toughness of sintered Nd-Fe-B magnets was obtained when the content of Nb was 1.5 at.%,but the magnetic properties of sintered Nd-Fe-B magnets drastically deteriorated when the content of Nb increased from 1.0 at.% to 1.5 at.%.The microstructure showed that overfull Nb addition made many ultra-fine grains get together,which led to the density of sintered Nd-Fe-B magnets decline and drastically deteriorated the magnetic properties of sintered Nd-Fe-B magnets.