放电等离子烧结制备纳米晶双相耦合(NdDy)_(11.5)(FeCoNb)_(82.4)B_(6.1)致密磁体  

Coupled Dense Nanocomposite (NdDy)_(11.5)(FeCoNb)_(82.4)B_(6.1) Bulk Magnets Prepared by SPS

作　　者：马毅龙[1] 刘颖[1] 李军[1] 杜慧龙[1] 高静[1] 高升吉[1] 

机构地区：[1]四川大学,四川成都610065

出　　处：《稀有金属材料与工程》2009年第12期2246-2249,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50801049);四川大学青年基金(06003)

摘　　要：使用放电等离子烧结(SPS)制备致密的纳米晶交换耦合Nd2Fe14B/α-Fe永磁合金。研究烧结温度、时间、压力对合金磁性能和显微组织的影响。结果表明,随温度、压力的升高,密度增大,磁能积增加;但温度过高或时间过长,使得晶粒长大,导致矫顽力降低。在烧结压力为500MPa,烧结温度为700℃保温3min后,得到密度为7.6g/cm3,晶粒细小的致密块体,其磁性能为:Br=0.81T,Hci=856kA·m-1,(BH)m=106kJ·m-3,其晶粒大小约20nm。The exchange coupled dense nanocomposite Nd2Fe144B/a-Fe isotropic bulk magnets were prepared by Spark Plasma Sintering （SPS） method. Influence of sintering temperature, time and pressure on the magnetic properties and microstructure was investigated. It is found that the density and magnetic energy product increased with the sintering temperature and pressure increasing; but the coercivity decreased with the temperature or time further increasing. After sintered at 700 ℃, 500 MPa, and held for 3 min, dense bulk magnets with fine grains of about 20 nm were achieved, whose magnetic properties were： Bt=0.81T, Hci =856 kA·m^-1, （BH）m =106 kJ.m^-3; the density was 7.6 g/cm^3.

关 键 词：纳米晶 放电等离子烧结 (NdDy)11.5(FeCoNb)82.4B6.1磁体 显微组织 

分 类 号：TM273[一般工业技术—材料科学与工程]