Cov nyhuv ntawm hmoov hloov additive nyob rau hauv cov txheej txheem ntau lawm ntawm NdFeb dawb paug.
Txhawm rau tsim cov kev ua haujlwm siab sintered NdFebhlau nplaum ruaj khovcov khoom siv, peb yuav tsum tswj qhov loj ntawm airflow sib tsoo hlau nplaum hmoov, kom qhov loj ntawm cov hmoov hlau nplaum nyob rau hauv 2.5 ~ 5μm accounted rau ntau tshaj 95%.Xinfeng Magnet pom tias cov txheej txheem tuaj yeem txhim kho tau zoo los ntawm kev ntxiv cov hmoov tshwj xeeb hloov kho ntxiv rau cov txheej txheem airflow milling.
Hmoov hloov kho additives yuav tsum muaj kev sib xyaw ua haujlwm, xws li: (1) kev ua haujlwm tiv thaiv oxidation;(2) Txhim kho cov hmoov fluidity muaj nuj nqi;(3) Tiv thaiv hmoov combustion, uas yog inflaming retarding muaj nuj nqi.Tus nqi ntawm cov additive yog li ntawm 0.035% ~ 0.05% (feem ntau) ntawm cov hmoov sib nqus, uas feem ntau yog ntxiv rau tib lub sijhawm nrog cov hmoov sib nqus ntawm cov khoom siv hauv cov khoom siv cua tshuab.
Additive yog ib tug ntau yam organic compound, nrog lipophilic pawg, uas yog hydrocarbon chains, muaj me me polar pawg, xws li lipid pawg, kom cov hydrocarbon saw muaj ib tug tsim nyog saw ntev.Sib nqus hmoov hmoov rov sib tsoo thiab kov nrog cov khoom ntxiv hauv cov txheej txheem sib tsoo, kom lub ntsej muag ntawm txhua qhov yog coated nrog ib txheej ntawm cov yeeb yaj kiab ntxiv nrog lub thickness ntawm 5 ~ 8nm.Nws ua lub luag haujlwm hauv qab no: (1) Tiv thaiv cov hmoov hmoov los ntawm kev sib cuag nrog huab cua, ua lub luag haujlwm ntawm kev tiv thaiv oxidation;(2) Ua kom cov nyhuv magnetostatic ntawm cov hmoov hmoov, txo cov agglomeration ntawm cov hmoov hmoov, ua lub luag haujlwm ntawm dispersant;(3) Ua kom lub fluidity thiab txav ntawm cov hmoov hmoov thiab ua si lub luag hauj lwm ntawm lubricant;(4) Nws muaj txiaj ntsig zoo rau kev taw qhia ntawm cov hmoov hmoov hauv cov hlau nplaum, uas tuaj yeem txhim kho kev taw qhia;BR tuaj yeem nce ntxiv los ntawm 0.02-0.04 T, thiab cov khoom siv hluav taws xob sib nqus (BH) m tuaj yeem nce ntxiv.Nws yuav tsum raug sau tseg tias qhov kub tsis hloov pauv ntawm cov tshuaj ntxiv no yog 350 ℃.Sintering kub yuav tsum tau tuav ntawm 400-420 ℃ rau ib lub sij hawm ntawm lub sij hawm, thiaj li hais tias additives yuav tawm los ntawm cov hlau nplaum, thiaj li tsis mus carburize.
Cov xwm txheej tsim nyog rau kev tsim cov khoom zoo sintered NdFeb mus tas li hlau nplaum.
Txhawm rau kom tau txais kev taw qhia zoo ntawm cov hlau nplaum, Xinfeng hlau nplaum tuaj rau qhov xaus tom qab xyoo ntawm kev sim thiab kev sib koom ua ke ntawm cov neeg siv khoom lag luam uas yuav tsum tau ua sintered NdFeb sib nqus hmoov kom tau raws li cov hauv qab no kom cov khoom zoo tuaj yeem tsim, thiab tsuas yog cov khoom siv tshuaj zoo, cov tshuaj yuav zoo dua.(1) Cov hmoov nplej me me (3 ~ 4μm), thiab qhov loj me me yog nqaim, uas yog, qhov yuav tsum tau muaj ntawm 3 ~ 4μm cov khoom suav nrog 95%, tsis muaj tsawg dua 1μm lossis ntau dua 7μm cov khoom, xyuas kom meej tias tag nrho cov khoom yog ib qho siv lead ua.(2) Cov khoom ntawm cov hmoov yog kheej kheej lossis kwv yees li spherical.(3) Cov khoom siv lead ua tsis zoo ntawm cov hmoov hmoov yuav tsum tsawg li tsawg tau.(4) Thaum crushing, nws yog qhov zoo dua rau kev tawg raws cov theem siv lead ua, thiab siv zog ua kom tiav qhov chaw ntawm txhua qhov muaj nplua nuj Nd theem, uas tso lub hauv paus rau cov kua theem sintering qab thiab tiv thaiv qhov tshwm sim ntawm chav kawm ⅱ lis ciam teb.(5) Cov impurities thiab gases adsorbed rau saum npoo ntawm cov hmoov yuav tsum tsawg li sai tau, tshwj xeeb tshaj yog cov ntsiab lus oxygen yuav tsum tsawg.Yog li ntawd, cov txheej txheem hmoov yuav tsum tau ua nyob rau hauv high purity inert gas tiv thaiv los yog lub tshuab nqus tsev tej yam kev mob, nyob rau hauv thiaj li yuav tiv thaiv magnetic hmoov sib cuag nrog oxygen los yog av noo.Cov xwm txheej saum toj no yog tsim nyog rau kev tsim khoom zoo sintered NdFeb cov hlau nplaum ruaj khov, tsis muaj txhua yam tsis xav tau, zoo li yooj yim, qhov tseeb txhua tus tuaj yeem ua tau zoo tshaj plaws tsis yooj yim, Xinfeng hlau nplaum txaus siab ua haujlwm ua ke nrog cov neeg los ntawm txhua qhov chaw ntawm lub neej. ua kom cov khoom zoo meej dua, thiab siv zog los muab cov neeg siv khoom zoo dua.
Xinfeng Magnet qhov kev ua tiav tshiab hauv kev txhim kho cov coercivity ntawm sintered NdFeb hlau nplaum.
Coercivity yog ib qho tseem ceeb ntawm cov hlau nplaum ruaj khov.Ua kom cov coercivity tuaj yeem ua rau cov khoom siv hluav taws xob sib nqus loj ntawm cov hlau nplaum, txhim kho cov demagnetization tsis kam ntawm cov hlau nplaum ruaj khov hauv kev siv, thiab txhim kho nws txoj kev ruaj ntseg.Tam sim no, nyob rau hauv kev npaj ntawm ntshiab ternary sintered NdFeb mus tas li hlau nplaum, cov kev sib nqus zog thiab cov theoretical qhov tseem ceeb, thiab remanence BR twb mus txog 96.27% ntawm nws theoretical tus nqi, thiab loj sib nqus zog khoom BH tau mus txog 91.5% ntawm nws theoretical. tus nqi.Txawm li cas los xij, kev quab yuam quab yuam tau mus txog tsuas yog 12% ntawm nws cov nqi theoretical.Nws yog lub peev xwm loj los txhim kho nws lub zog quab yuam, tseem muaj qhov nce ntxiv hauv qhov chaw.Xinfeng hlau nplaum tau ua haujlwm hnyav rau qhov no.
Ua ntej, lub zog ntawm cov hlau nplaum tuaj yeem txhim kho tau zoo los ntawm kev hloov Nd nrog ib nrab Dy thiab Tb.Txawm li cas los xij, hauv cov khoom siv hlau tsis tshua muaj hauv ntiaj teb, Dy thiab Tb yog cov ntsiab lus qis thiab kim, thiab Dy thiab Tb tsuas yog ntxiv rau hauv cov lej xwb.Qhov thib ob, qhov sib ntxiv ntawm qee cov hlau xws li AL, Nb, Ga, Ti, Zr, Mo, thiab lwm yam, thaum cov khoom no nkag mus rau hauv cov khoom siv lead ua, cov txheej txheem microstructure thiab cov txheej txheem kev ua tau zoo tau pom tseeb, thiab ua kom cov hlau nplaum muaj zog.Thib peb, lub coercivity ntawm cov hlau nplaum tuaj yeem txhim kho tau zoo los ntawm kev ntxiv cov ntsiab lus thiab siv qhov kub thiab txias sintering los yog ob txoj kev alloy los txo qhov nruab nrab siv lead ua loj.
Tom ntej no, Xinfeng hlau nplaum yuav ua hauj lwm nyuaj los txhim kho cov khoom siv hlau nplaum loj ntawm sintered NdFeb, thiab pheej muab cov khoom zoo rau cov neeg siv khoom.
Post lub sij hawm: Jul-12-2018