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1、浙江工業(yè)大學(xué)碩士學(xué)位論文稀土永磁材料NdFeB磁粉改性的研究摘要本課題采用磁場(chǎng)攪動(dòng)直流電沉積裝置在NdFeB磁粉表面電沉積納米級(jí)金屬鍍層。選用的金屬元素是鐵、銅、鋅、鎳及其組合鍍層。改善了Ndl；eB磁粉耐腐蝕性能和磁性能。分析測(cè)試了包覆金屬鍍層的NdFeB磁粉的電極電位值、包覆鍍層前后NdFeB磁粉制備的粘結(jié)磁體的電阻率與磁性能。檢驗(yàn)NdFeB磁體的耐腐蝕性能和磁性能。磁粉電極電位表現(xiàn)為NdFeB磁粉和包覆金屬鍍層的混合電位。探討了電極電位在金屬腐蝕性能方面的作用。金屬鋅鍍層比基體NdFeB電極電位更負(fù)，在發(fā)生電化學(xué)腐蝕作用時(shí)，可起到犧牲陽(yáng)極保護(hù)基體的作
2、用。而金屬鎳鍍層是最常應(yīng)用的NdFeB磁體的防護(hù)鍍層。粘接NdFeB磁體的電阻率表現(xiàn)為NdFeB磁粉和包覆金屬層的混合電阻率。結(jié)果表明：包覆zn／Ni雙金屬層的NdFeB磁體的電阻率卻異常增大；包覆金屬cu鍍層的電阻率值最小，因?yàn)榻饘賑u的電阻率較小，是良好的導(dǎo)電材料。能夠改善NdFeB磁體的導(dǎo)電性能的目的。浙江工業(yè)大學(xué)碩士學(xué)位論文包覆前后的粘接NdFeg磁體的矯頑力有不I司程度地降低：而最大磁能積和剩余磁感應(yīng)強(qiáng)度卻變化不大。關(guān)鍵詞：NdFeB磁粉，電沉積，改性，耐腐蝕Ⅱ浙江』=、Ip大學(xué)碩士學(xué)位論文STUDYoNMoDIFIEDNDFEBPERMANEN
3、TMAGNETICPOWDERABSTRACTThisthesisdescribeselectrodepositednano—layeronNdFeBmagneticpowdersbythebarrelplatingDCelectroplatingmethod．Fe，Cu，Ni，Zn，F(xiàn)e／NiandZn／Ninano—layerwerefabricated．ResearchresultsindicatedthatthecorrosionresistanceandpracticablepropertiesofNeodymium—iron-boronmagn
4、eticpowderswereimprovedTheelectrodepotential，resistivelyratioandmagnetismoftheboundedNdFeBpermanentmagnetsthatweremodifiedweretestedintheresearch．TheelectrodepotentialoftheNdFeBmagneticpowdersandtheplatingwasmeasured．thecorrelationbetweentheelectrodepotentialandcorrosionresistance
5、ofNdFeBmagneticpowderswasdiscussed．TheelectrodepotentialofzincwaslessthanthatofNdFeBmagneticpowdersNdFeBmagneticpowderswereprotectedbecauseZinchadbeentheanodethroughtheelectrochemistrycorrosion．NikelplatingonNdFeBpermanentmagnetswasgenerallyadoptedⅢ浙江工業(yè)大學(xué)碩士學(xué)位論文Themixedresistivelyr
6、atiooftheboundedNdFeBmagnetsandtheplatingwasanalyzed．TheresultsindicatedthattheresistivelyratiooftheNdFeBmagneticpowderscladdedbytheZn／Niwashiglllylargerthanthatofnon-claddingNdFeBmagneticpowders．Onthecontrary，theresistivelyratiooftheNdFeBpermanentmagneticpowderscladdedbycopperwas
7、lowest．Becausethecopperresistivelyratioislow,itisagoodconductor．Electrodepositednano—layerplatingonthesurfaceofNdFeBmagneticpowdersmaybeabletoimproveonelectricitycapabilityoftheboundedNdFeBmagnets．AccordingtostudyonmagneticparametersoftheboundedNdFeBmagnets：coerciveforce(Hc)，resid
8、ualmagnetismintensity(Br)，(BH)max
