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简介：Aseriesofnanocompositethinfilms,composedofNd2Fe14Bandα-Fe,hasbeenpreparedbyDC-magnetronsputteringcombinedionbeamsputteringontoSi(100)substrates.Theeffectsofpostannealingonthemicrostructureandmagneticpropertiesof[NdFeB/α-Fe/NdFeB]-typethinfilmshavebeeninvestigated.TheX-raydiffraction(XRD)studyshowedthatannealingofthefilmsfor30minattemperatures550,600,650,700℃resultedintheappearanceofdiffractionpeaks,characteristicforNd2Fe14Btetragonalstructure,α-FeandNd2O3phases.TheinvestigationusingtheVibratingSampleMagnetometer(VSM)withamaximumappliedfieldof2Tindicatedthatwiththeincreaseoftheannealingtemperature,themagneticpropertiesofthemultilayerfilmswereimprovedandreachedpeakvalueat650℃(Hci=41.72kA·m-1,Mr/Ms=0.4,(BH)max=30.35kJ·m-3),afterwhichthemagneticpropertiesweredecreasedgreatly.Alongwiththeincreaseofthethicknessofα-FelayerfromTα-Fe>16nm,thecoercivityHci,saturationmagnetizationMs,andremanenceratioMr/Msalldeclined.AstheAtomicForceMicroscope(AFM)indicated,afterbeingannealedat650℃for30min,thesamplewasshowedfinesurfacemorphologywithgrainsize60nm≤dα-Fe≤80nmand100nm≤dNdFeB≤150nm.

简介：Chinatotallyexportednearly24,000tonsofNdFeBproductsduring2013,including18,825tonsofpermanentmagnet,valuedUSD1.34billionatanaveragepriceof71.4USD/kg;3,277tonsofNdFeBmagneticpowder,valuedUSD101millionatanaveragepriceof30.9USD/kg;1,334tonsofstripcastingribbon,withtotalexportvalueofUSD74millionatanaveragepriceof55.3USD/kg;and586

简介：Theyear2007witnessesthe24~(th)anniversaryoftheinventionofsinteredNdFeBmagnets.MagneticenergyproductofsinteredNdFeBmagnetshasbeenincreasedto474kJ/m~3(59.5MGO_e)fromprimary279kJ/m~3(35MGO_e)in1983.Globaloutputofsinteredmagnetshadrisentoaround50,000tonsin2006fromtessthan1tonin1983.Consideringtheproduction

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简介：最近,德国西门子公司的韦柯尔和奥地利理工大学的研究人员采用交换偶合显微结构获得了高剩磁硬磁材料,该材料的剩磁高于微结构较粗的同类合金的剩磁。具有显微结构的这种材料由一种硬磁基体组成,基体内分布有软磁晶粒。如果该软磁晶粒小到使

简介：Rareearthperformancematerialsgrowrapidlyinrecentyearswithtechnicalprogressinelectronicinformation,autosandmanufacturingindustries.Asthefastestdevetopingfunctionalmaterials,NdFeBmagnetshavebecomethemainforcethatpushesthedevelopmentofwholerareearthindustry.

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简介：4.MainbusinessincomeincreasedinlistedcompaniesChineseNdFeBindustrydevelopedsteadilyinChinain2011,andmainbusinessoflistedcompaniesalsorealizedstablegrowth.Fromthe2010AnnualReportofZhongKeSanHuanHigh-TechannouncedonApril1,2011,salesincomeofthecompanyreached2.36billionyuanin2010,anincreaseof51.05%over2009;totalprofit

简介：4.GlobalmagnetindustrycentershiftedEuropewastheglobalmagnetscenterbeforeWorldWarⅡ.Afterwards,ithadshiftedtoUSA.Tilllate1960s,thecenterhadmovedtoJapan.Eventually,itmovedtoChinaatthebeginningof21stcentury.Magnetoutputindifferentcountries(2005)isshowninTable3.

简介：介绍了黏结钕铁硼的发展现状及制备工艺过程。从影响黏结永磁体性能的各个因素出发,包括磁粉的制备、成型工艺、黏结剂及助剂的选择、磁体的防腐等方面介绍黏结NdFeB永磁体的发展。

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简介：Investigationintothemagnetswithdifferentsquarenessofhysteresisloop(SHL)revealsthatthemicrostructureofsinteredNdFeBmagnetshasgreateffectsontheSHLofthemagnets.TheabnormalgraingrowthdeterioratestheSHLseriously.Theshapeofthegrainandthegrainboundaryaffecttheintensityofdemagnetizationfield,andconsequentlyontheSHL.Theaddedelementshaveeffectsonthephasestructuresanddistributionsinthemagnets,whichinfluencestheuniformofdemagnetizationfield.

简介：散开的磁性和微观结构退火了[Ta/Nd/NdFeB/Nd/Ta]薄电影被调查了。这些电影被在为10min的650℃退火与Nd/NdFeB层(R=0～3.3)的各种各样的厚度比率在Si底层上扔，然后扩散了并且结晶。没有Nd层的电影显示出软磁性的行为和a-Fe阶段的高内容。有R的电影>=1与大约20kOe的高coercivity显示出好难磁性。

简介：Melt-spunribbonswhicharetheimportantrawmaterialforhot-deformedmagnetscanbepreparedbysingle-rollermelt-spinning.Inordertopreparewell-structuredribbons,themodeloftemperaturefieldforsingle-rollermelt-spinningprocesswasconstructedinthiswork.Theheatconductioninthisprocesswassimplifiedasonedimensionalheatconductionproblem.Itwasshownbymodelingthat,thetemperaturefieldinthemelt-spinningbeforesolidificationinthismodelcouldbedescribedasthisequationT(x,t)=Tmoexp[–k(x–x0)–k2αt]+T0.ThetemperatureT(x,t)ofthealloymeltsdecreasedwithincreasedpositionxandcoolingtimetexponentiallyfromthewheel-freesurfacetothewheel-sidesurface.TheconstantkdeterminedthedecreasespeedofalloytemperatureT(x,t),whichwasproportionaltotheinterfacialheattransfercoefficienthandtheinterfacialareaofheatconductionA0,butinverselyproportionaltothethermalconductivityK.x0wasthethicknessofthealloymelt.Withincreasedx0,thetemperaturedifferencebetweenwheel-freesurfaceandthewheel-sidesurfacebecamelarger,whichwouldleadtolargerdifferenceingrainsize.Inexperiments,theinfluenceofmelt-spinningprocessparametersonthetemperaturefieldmodelwasdiscussed,suchascoolingrollermaterials,wheelspeed,andsoon.Melt-spunribbonspreparedbysingle-rollermeltspinningatdifferentwheelspeedwereinvestigatedandmagneticpropertiesofdie-upsetmagnetsfrommelt-spunribbonsondifferentcoolingrollerwereanalyzed.Thevariationofgrainsizeinthedepthdirectionconsistedwithtemperaturefieldmodel.Thismodelprovideddirectionsforthepreparationofmelt-spunribbonswithuniformlydistributedfinegrains,whichwereverynecessaryforproducinghot-deformedmagnetswithhighmagneticperformance.

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简介：摘要：传统温压成形过程中由于压力分布不均匀易造成NdFeB粘结磁体各部分密度和强度的不均匀，为提高NdFeB粘结磁体的性能，对温压成形过程中NdFeB粘结磁体进行保压固化。研究表明温压压制粘结NdFeB磁体后，对NdFeB粘结磁体保压固化一段时间，不仅提高磁体的密度和综合磁性能，还可以改善磁体的表面质量。

简介：Sinomagneticstechnologyisahigh-techenterprisespecializinginR&Dandproductionofrareearthpermanentmagnetmaterials.Itisreportedthattheenterprisehasacceleratedtheconstructionofannual3000tonsofhighperformancesinteredNdFeBproductionbase,andtheconstructionofthebasehasbeencompletedandputintouse.

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