Based on the difference of the Y-terminal functional group of the silane coupling agent(Y-Si(X)3),four different silane coupling agents were employed to pretreat the surface of the NdFeB powders.The effects of silane coupling agents on the flowability and compressibility of compounds for preparing bonded NdFeB magnets were studied.It is indicated that compounds pretreated by silane coupling agents have weaker friction and meshing force.The apparent density is increased by 0.3 g/cm3 compared with the compound without silane coupling agent,and the radial crushing strength is significantly increased by about 3-4 times.In addition,the epoxy resin is more evenly distributed on the surface of the compounds treated by silane coupling agents observed by scanning electron microscopy,and some agglomerated particles are produced.Also,the compressibility of compounds with silane coupling agents is signifi-cantly improved due to the fact that hardening exponents are reduced.However,the addition of silane coupling agents has almost no effect on the magnetic properties of bonded magnets.The special energy was used to manifest the flowability of magnetic powder particles representing the macroscopic per-formance of the force between powder particles,providing a new direction for the study of the interface compatibility of two-phase or multiphase composite materials.

National Engineering Research Center for Rare Earth Materials,GRINM Group Co.,Ltd.,Beijing 100088,China;GRIREM Advanced Materials Co.,Ltd.,Beijing 100088,China;General Research Institute for Nonferrous Metals,Beijing 100088,China

[1]Xiaowei Zhang;Zilong Wang;Tianhao Li;Shengjie Zhu;Dunbo Yu;Wenlong Yan;Yang Luo-.Effect of silane coupling agents on flowability and compressibility of compound for bonded NdFeB magnet)[J].稀土学报（英文版）,2022(05):772-777

Effect,silane,coupling,agents,flowability,compressibility,bonded,NdFeB,Based,difference,terminal,functional,group,Si,four,different,were,employed,surface,powders,effects,compounds,preparing,magnets,studied,It,indicated,that,pretreated,by,have,weaker,friction,meshing,force,apparent,density,increased,cm3,compared,without,radial,crushing,strength,significantly,about,times,In,addition,epoxy,resin,more,evenly,distributed,observed,scanning,electron,microscopy,some,agglomerated,particles,produced,Also,improved,due,fact,hardening,exponents,reduced,However,almost,no,magnetic,properties,special,energy,was,used,manifest,representing,macroscopic,formance,between,providing,new,direction,study,interface,compatibility,two,multiphase,composite,materials

0.481096