添加釓及釔的釹鐵硼永磁材料制備工藝研究

1、分類號(hào)：密級(jí)：學(xué)號(hào)：2007141單位代碼：10407碩士學(xué)位論文論文題目:添加添加釓及釔的釹鐵硼永磁材料制備工藝研究的釹鐵硼永磁材料制備工藝研究研究方向材料冶金材料冶金專業(yè)名稱有色金屬冶金有色金屬冶金研究生姓名孟凡偉孟凡偉導(dǎo)師姓名、職稱曾青云曾青云教授教授20092009年1212月1515日江西贛州IIIAbstractNdFeBpermanentmagexhibitsthehighestmagpropertiesoptimalpe

2、rfmancepriceratioofallmagmaterialsfromitsinceptionin1983itsindustrieshavebeentherapiddevelopmentwidelyusedineveryfieldofthenationaleconomy.WiththerapidgrowthofnewrareearthmaterialsmarketsuchasNdFeBpermanentmagmaterialsti

3、mulatingtherapiddevelopmentofrareearthindustryleadingtotheproductionscalecapacityofrareearthismuchlargerthantheconsumptioncapacitytheapplicationofrareearthelementsisaseriousimbalanceincreasetheriskofenterprisesoperationa

4、ffectthehealthydevelopmentofrareearthindustry.Therefeweshouldspeeduptheapplicationdevelopmentoftheserareearthelementslookfthenewappliedfieldskeepthebalanceoftheconsumptionofallrareearthelements.Inthispaperitisfeasiblebym

5、eansofusinglowcostrelativeoverproductionofgadoliniumyttriumpartiallyreplacesthetraditionalprocessofneodymium，praseodymiumdysprosiumotherrareearthelementspreparingnewNdFeBpermanentmagmaterials.Specificstudyofthisarticleco

6、ntentasfollows:TheexperimentadoptsthegadoliniumironalloytheyttriumironalloythegadoliniumyttriumironalloytoreplacepurerareearthmetalproducingNdFeBpermanentmagicmaterialsreduceitscostofproductiongreatlyalsodecreasetheenvir

7、onmentalpollutionatthesametimeitmakesgadoliniumyttriumhaveanewapplicationfieldsolvetheproblemofagreatmanyofgadoliniumyttriumwhichissetasideimprovetheutilizationofrareearthresources.Thekeytothisexperimentishydrogenexplode

8、twostagetemperingprocess.ThehydrogenexplodescanmakealloysdehiscencealongtheNdrichphasemakesuretheintegrityofthegrainofNd2Fe14BNdrichphase.Usingthetwostagetemperingprocessexceptionallythelowertemperatureis500℃(generallyth

9、atis600℃)theextentionofthetimeis300minswecangettheoptimalmagproperties.FthenewtypeofNdFeBpermanentmagwiththeadditionofgadoliniumyttriumincreasinggraduallyremanencemaximummagicfluxdensityunilateraldeclinebuttheintrinsicco

10、ercivitychangedlittleslightlyfirstthendecreasing.Whenthecontentofgadoliniumyttriumat2wt%theintrinsiccoercivityisbestbutwhenitismethan2wt%theintrinsiccoercivitydecreasesrapidly.Atthesametimeaddinggadoliniumyttriumcompound