Txij li thaum nws pib, NdFeB cov khoom siv hlau nplaum ruaj khov tau nyiam ntau yam rau nws cov khoom sib nqus zoo dua thiab hu ua "Magnet King". Nrog rau kev loj hlob tsis tu ncua ntawm kev lag luam xav tau, NdFeB cov cuab yeej tsim khoom thiab kev ua haujlwm hlau nplaum kuj tseem txuas ntxiv txhim kho thiab txhawb nqa. Peb feem ntau siv cov ntsuas ntawm remanence, coercivity, thiab siab tshaj plaws magnetic zog khoom los ntsuas cov khoom sib nqus ntawm cov khoom sib nqus.
Residual Magnetism Br
Nws yog hais txog qhov sib nqus induction siv los ntawm cov hlau nplaum tom qab cov hlau nplaum yog magnetized los ntawm cov hlau nplaum sab nraud nyob rau hauv qhov chaw kaw-circuit rau kev saturation thiab tom qab ntawd cov hlau nplaum sab nraud raug tshem tawm. Yog tias cov hlau nplaum muab piv rau daim txhuam cev, cov hlau nplaum seem zoo li cov dej hauv cov ntaub txhuam hniav thaum nws saturated nrog dej.
Coercive Force Hcb thiab Intrinsic Coercive Force Hcj
Cov dej hauv daim txhuam cev yog nqus mus rau qhov siab tshaj plaws, thiab tom qab ntawd cov dej yog nias tawm kom txog thaum tsis muaj dej hauv daim txhuam cev. Lub zog no yog lub zog quab yuam. Nws yog tus nqi ntawm magnetic teb lub zog thaum lub magnetic induction intensity poob mus rau xoom thaum lub hlau nplaum nyob rau hauv ib tug rov qab demagnetization teb. Txawm li cas los xij, qhov sib nqus polarization sib nqus ntawm cov hlau nplaum tsis yog xoom nyob rau lub sijhawm no, tab sis qhov rov qab sib nqus teb thiab cov hlau nplaum sab hauv ntawm cov hlau nplaum tshem tawm ib leeg. Yog hais tias lub sab nraud magnetic teb raug tshem tawm nyob rau lub sij hawm no, cov hlau nplaum tseem muaj tej yam sib nqus zog, thiab lub intrinsic coercive quab yuam ua rau lub sab hauv magnetic teb ntawm cov hlau nplaum yuav tshem tawm ib leeg. Lub zog ntawm daim ntawv thov rov qab magnetic teb yuav tsum tau txo qhov sib nqus polarization rau xoom.
Maximum Sib Nqus Zog Khoom (BH) max
Nws sawv cev rau qhov sib nqus zog ceev tsim nyob rau hauv qhov chaw nruab nrab ntawm ob lub sib nqus ncej ntawm cov hlau nplaum, uas yog, lub zog hlau nplaum zoo li qub rau ib chav tsev ntim ntawm cov pa sib txawv. Nws yog tus nqi siab tshaj plaws ntawm cov khoom ntawm B thiab H. Nws qhov loj me ncaj qha qhia qhov ua tau zoo ntawm cov hlau nplaum.
Dab tsi txiav txim siab qhov kev ua tau zoo saum toj no ntawm NdFeB hlau nplaum?
Yuav ua li cas txhawm rau txhim kho kev ua tau zoo ntawm cov khoom sib nqus los ntawm kev txhais tau tias?
Thiab yuav ua li cas kom tsis txhob poob ntawm cov khoom sib nqus thaum siv?
Cov khoom siv raw muaj pes tsawg leeg thiab cov txheej txheem tsim khoom ntawm NdFeB hlau nplaum txiav txim siab nws cov khoom sib nqus innate. Tom qab dhau los ua cov khoom sib nqus muaj zog, nws qhov chaw ua haujlwm (xws li kub, av noo, thiab lwm yam) yuav cuam tshuam rau kev ua haujlwm ntawm nws cov khoom sib nqus innate. Kev siv tsis raug Yog tias muaj, kev demagnetization mus tas li yuav tshwm sim.
1. Kev cuam tshuam ntawm raw khoom muaj pes tsawg leeg ntawm lub zog sib nqus ntawm NdFeB
Raws li lub npe qhia, NdFeB yog cov khoom sib nqus ua los ntawm cov hlau tsis tshua muaj hauv ntiaj teb neodymium, hlau ntshiab, thiab boron siv cov hmoov metallurgy technology. Txhawm rau txhim kho cov khoom sib nqus ntawm NdFeB, ntxiv cov khoom ntxiv tuaj yeem ua raws li cov khoom siv ternary Nd-Fe-B. Lwm cov ntsiab lus, tab sis qhov cuam tshuam ntawm qhov sib ntxiv ntawm cov ntsiab lus ntawm kev ua haujlwm ntawm cov hlau nplaum yuav yog bidirectional. Cov ntsiab lus ntxiv yuav tsum tau txiav txim siab raws li cov kev cai tshwj xeeb rau kev ua haujlwm ntawm cov khoom siv hlau nplaum uas NdFeB muaj zog hlau nplaum siv.
2. Kev cuam tshuam ntawm cov txheej txheem tsim khoom ntawm cov khoom sib nqus muaj zog ntawm NdFeB
Txhawm rau kom tau txais txiaj ntsig zoo NdFeB cov hlau nplaum ruaj khov, cov thev naus laus zis tshiab thiab cov txheej txheem tau tshwm sim tas li. Hauv kev tsim cov txheej txheem ntawm sintered NdFeB, qhov teeb meem tseem ceeb yog los tiv thaiv cov nag lossis daus ntawm -Fe theem thiab oxidation ntawm cov hlau, uas ua rau nws nyuaj kom tau txais ib qho zoo tagnrho microstructure. Txhawm rau daws cov teeb meem no, cov txheej txheem tshiab thiab cov txheej txheem tau tshwm sim tas li nyob rau hauv kev xyaum, xws li Ntxiv cov tshuaj tua kab mob thiab cov roj nplua nyeem thiab siv cov txheej txheem nrawm nrawm los npaj cov hlau nplaum, cov txheej txheem kev npaj ob theem, cov txheej txheem ntub dej molding, thiab lwm yam.
Qhov txiaj ntsig loj tshaj plaws ntawm kev ntxiv cov tshuaj tua kab mob antioxidant yog txo cov pa oxygen ntawm cov hlau nplaum kawg. Nyob rau tib lub sijhawm, cov hmoov sib nqus tuaj yeem ua rau hauv av finer, uas yog qhov zoo rau kev txhim kho lub zog coercive. Tsis tas li ntawd, vim qhov txo qis ntawm cov pa oxygen, nws kuj tseem muaj txiaj ntsig los txhim kho lub zog quab yuam. Piv nrog rau cov txheej txheem ib txwm muaj, qhov sib xyaw ua ke ntawm cov hlau nplaum nrog cov tshuaj antioxidants ntxiv tuaj yeem nce li ntawm 160kA / m.
Tom qab ntxiv cov roj nplua nyeem, qhov kev sib txhuam ntawm cov hmoov sib nqus yog txo, qhov fluidity ntawm cov hmoov sib nqus zoo dua, thiab qib ntawm kev taw qhia yog nce, yog li ua kom cov hlau nplaum seem.
Lub thickness ntawm NdFeB ribbon npaj los ntawm txoj kev ribbon spinning yog {{0}}.25 ~ 0.35mm, uas tuaj yeem tshem tawm -Fe theem. Vim lub zog tiv thaiv oxidation muaj peev xwm ntawm cov hmoov uas tsim los ntawm txoj siv txoj siv spinning, cov hlau nplaum loj yuav me me thiab lub zog quab yuam tau zoo heev.
3. Kev cuam tshuam ntawm qhov chaw ua haujlwm ntawm lub zog sib nqus ntawm NdFeB
Kub: NdFeB hlau nplaum muaj qhov ntsuas kub ua haujlwm nruj. Thaum qhov kub siab tshaj qhov kev khiav hauj lwm kub, cov hlau nplaum yuav demagnetize. Thaum qhov kub siab tshaj qhov kub ntawm Curie, cov hlau nplaum demagnetization yuav hloov tsis tau.
Humidity: Sintered NdFeB yog cov khoom sib nqus nias thiab tsim los ntawm cov txheej txheem hmoov metallurgy. Nws cov qauv sab hauv muaj qhov khoob thiab yooj yim heev rau oxidize. Yog li ntawd, sintered NdFeB yuav coated rau kev tiv thaiv corrosion. Txawm li cas los xij, txheej hlau nplaum tsis tuaj yeem daws qhov cuam tshuam ntawm ib puag ncig cov av ntawm cov hlau nplaum. Qhov ib puag ncig qhuav, lub zog sib nqus ntawm cov hlau nplaum yuav kav ntev dua.
