Koj paub ntau npaum li cas txog NdFeB hlau nplaum?

Cov khoom siv hlau nplaum tas mus li feem ntau suav nrog AlNiCo (AlNiCo) system hlau nplaum ruaj khov, thawj tiam SmCo5 cov hlau nplaum ruaj khov (hu ua 1: 5 samarium cobalt alloy), tiam thib ob Sm2Co17 (hu ua 2: 17 samarium cobalt alloy) cov hlau nplaum ruaj khov, peb tiam tsis tshua muaj. Lub ntiaj teb ruaj khov hlau nplaum hlau NdFeB (hu ua NdFeB alloy). Nrog rau kev txhim kho kev tshawb fawb thiab thev naus laus zis, kev ua haujlwm ntawm NdFeB cov khoom siv hlau nplaum ruaj khov tau raug txhim kho thiab daim ntawv thov teb tau nthuav dav. Lub sintered NdFeB nrog cov khoom siv hluav taws xob sib nqus (50 MGA ≈ 400kJ / m3), siab coercivity (28EH, 32EH) thiab siab ua haujlwm kub (240C) tau tsim muaj kev lag luam. Cov ntaub ntawv tseem ceeb ntawm NdFeB cov hlau nplaum ruaj khov yog cov hlau tsis tshua muaj hauv ntiaj teb Nd (Nd) 32%, hlau hlau Fe (Fe) 64% thiab cov khoom tsis yog hlau B (B) 1% (me me ntawm dysprosium (Dy), terbium ( Tb), cobalt (Co), niobium (Nb), gallium (Ga), txhuas (Al), tooj liab (Cu) thiab lwm yam khoom). NdFeB ternary system ruaj khov hlau nplaum yog raws li Nd2Fe14B compound, thiab nws muaj pes tsawg leeg yuav tsum zoo ib yam li cov compound Nd2Fe14B molecular mis. Txawm li cas los xij, cov khoom sib nqus ntawm cov hlau nplaum muaj tsawg heev lossis txawm tias tsis yog-sib nqus thaum qhov piv ntawm Nd2Fe14B tau faib tag nrho. Tsuas yog thaum cov ntsiab lus ntawm neodymium thiab boron nyob rau hauv cov hlau nplaum tiag tiag yog ntau dua li cov ntsiab lus ntawm neodymium thiab boron hauv Nd2Fe14B compound, nws tuaj yeem tau txais cov khoom sib nqus zoo dua qub.

Sintering: Cov khoom xyaw (formula) → smelting → hmoov ua → nias (forming orientation) → sintering thiab aging → sib nqus khoom → mechanical processing → deg txheej kho (electroplating) → tiav cov khoom soj ntsuam
Bonding: raw khoom → particle loj hloov → sib tov nrog binder → molding (compression, extrusion, txhaj) → tua hluav taws (compression) → reprocessing → tshuaj xyuas cov khoom tiav

Muaj peb yam tseem ceeb: remanence Br (Residual Induction), chav tsev Gauss, tom qab lub magnetic teb raug tshem tawm ntawm lub saturation lub xeev, qhov seem sib nqus flux ceev, sawv cev rau sab nraud magnetic teb lub zog ntawm cov hlau nplaum; coercive force Hc (Coercive Force), unit Oersteds, yog muab cov hlau nplaum nyob rau hauv ib tug rov qab siv magnetic teb, thaum lub magnetic teb thov nce mus rau ib tug tej lub zog, lub sib nqus flux ceev ntawm cov hlau nplaum yuav siab dua. Thaum cov ntaub ntawv sib nqus tau nce mus rau qee lub zog, cov hlau nplaum ntawm cov hlau nplaum yuav ploj mus, lub peev xwm los tiv thaiv cov hlau nplaum thov hu ua Coercive Force, uas sawv cev rau qhov ntsuas ntawm demagnetization tsis kam; Cov khoom siv hluav taws xob sib nqus BHmax, chav tsev Gauss-Oersteds, yog lub zog sib nqus hluav taws xob tsim los ntawm ib chav ntim ntawm cov khoom, uas yog lub cev muaj zog ntawm lub zog ntawm cov hlau nplaum tuaj yeem khaws cia.

Tam sim no, cov ntawv thov tseem ceeb yog: lub tshuab hluav taws xob ruaj khov hlau nplaum, lub tshuab hluav taws xob, MRI, sib nqus sib nqus, lub suab hais lus, sib nqus levitation system, sib nqus sib nqus, sib nqus nqa, ntsuas ntsuas, ua kua magnetization, cov khoom siv sib nqus, thiab lwm yam. Nws tau dhau los ua cov khoom siv tsis tau. rau kev tsim tsheb, kev siv tshuab dav dav, kev lag luam petrochemical, hluav taws xob cov ntaub ntawv kev lag luam thiab kev siv thev naus laus zis.

NdFeB yog cov khoom siv hlau nplaum uas muaj zog tshaj plaws nyob hauv lub ntiaj teb, nws cov khoom siv hluav taws xob sib nqus yog kaum npaug siab dua li cov ferrite siv dav, thiab txog li ob zaug siab li thawj zaug thiab thib ob tiam ntawm cov hlau nplaum tsis tshua muaj hauv ntiaj teb (SmCo mus tas li hlau nplaum), uas yog hu ua "tus huab tais ntawm cov hlau nplaum ruaj khov". Los ntawm kev hloov lwm yam khoom siv hlau nplaum tas mus li, qhov ntim thiab qhov hnyav ntawm lub cuab yeej tuaj yeem raug txo qis. Vim muaj cov peev txheej ntau ntawm neodymium, piv nrog samarium-cobalt cov hlau nplaum ruaj khov, cov cobalt kim kim yog hloov los ntawm cov hlau, uas ua rau cov khoom siv tau zoo dua.