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The Optimazation and Mechanism Reaserch on Bonded NdFeB Magnets

Author: ZhaoXuDong
Tutor: XuQiMing
School: Xi'an University of Architecture and Technology
Course: Materials Science
Keywords: Bonded NdFeB Molding Preparation process Mechanism Analysis Orthogonal test
CLC: TM273
Type: Master's thesis
Year: 2009
Downloads: 38
Quote: 0
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Abstract


Large number of experiments to study the preparation process of the bonded NdFeB magnets , coupling agent , and magnetic particle size , binder , curing process and molding process on the magnetic properties and mechanical properties of bonded NdFeB magnets and the theoretical mechanism . Studies have shown that : with the same content of silane coupling agents and titanate coupling agent , titanate coupling agent on the surface of the magnetic powder coating effect is better , magnetic high . Strong the magnet mechanical properties and a silane coupling agent-treated . Paper, lt ; 100 mesh, 100 mesh to 200 mesh , gt ; 200 mesh three different particle size range of the magnetic powder whose particle size ratio , the particle size ratio of 1:2:3 when higher performance of the magnet . After comparisons are two options for the type of binder ( epoxy resin E - 12 and E- 44 ) , epoxy resin ( E - 12 ) in a content of about 2.5wt% , the better performance of the magnet . The curing process has some influence on the magnetic properties , curing temperature and curing time to select the appropriate 120 ° C × 120min . The molding pressure as 600 MPa , the dwell time between 30S ~ 40S magnet has a good performance . Optimized by orthogonal test preparation process to determine the order of magnitude of the various factors affecting the magnetic properties : molding Pressure gt ; particle size ratio gt ; the binder gt ; coupling agent. The optimal parameters : particle size ratio lt ; Head: 100 100 mesh to 200 mesh : GT ; 200 : 1:2:3 , coupling : 1.0 wt % binder : 2.5 wt % , the pressing pressure : 600 MPa when , and to prepare a better performance of bonded NdFeB magnets , performance : B , r = 0.724T , Hic = 873kA · m -1 < / sup > ( BH ) max = 76 kJ · m -3 , σ = 126Mpa.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Magnetic materials,ferrite > Permanent magnet materials, permanent magnet
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