Sintered NdFeB tas li hlau nplaum yog tsim los ntawm hmoov hlau metallurgy txheej txheem. Tus txheej txheem yog raws li nram no:
Kev ua cov raw cov ntaub ntawv → tov → melting → milling → sib nqus taw qhia thiab kev sib txuam → Sintering Densification → chiming aging → machining thiab deg kho → paub.
Los ntawm cov txheej txheem technology, nws tuaj yeem pom tau tias tag nrho tus txheej txheem yog ib qho kev sib txuas ntawm engineering, tshwj xeeb tshaj yog cov kev ua tau zoo NdFeB cov khoom sib txuas sib nqus. Txhua txheej txheem ntawm nws cov txheej txheem ntau lawm " muaj txoj cai txiav txim siab "thiab" txoj cai ntawm kev tsis pom zoo "rau qhov khoom ua tau zoo.
Yuav kom tsim cov kev kawm siab NdFeB cov ntaub ntawv tseem ceeb, lub koom haum thiab tus neeg saib xyuas ntawm lub tuam txhab yuav tsum them nyiaj rau txhua qhov txuas ntawm cov txheej txheem ntau lawm thiab coj cov neeg ua hauj lwm kom paub meej txog txhua yam hauv cov txheej txheem. Qhov no yog "Plaub Tiv Thaiv" ntawm "Anti - oxidation, ua rau tsis meej pem, tiv thaiv impurity thiab damp pov thawj".
Yuav kom paub tseeb tias qhov zoo ntawm cov ntaub ntawv NdFeB uas yog cov khoom sib txuas hauv cov cuab yeej ua hauj lwm, peb yuav tsum ua raws li "plaub kev tiv thaiv", xws li, kev tiv thaiv oxidation, ua rau tsis muaj kev ntxhov siab, tiv thaiv tsis zoo,
Yog li yuav ua li cas tiv thaiv oxidation?
NdFeB yog lub ntiaj teb tsis tshua muaj hlau nplaum cov khoom siv, uas muaj cov kev faib loj ntawm tsawg lub ntiaj teb. Tus cwj pwm ntawm cov keeb kwm lub ntiaj teb tsawg tshaj plaws yog tias cov khoom siv tshuaj lom neeg muaj mob heev, nws yooj yim rau cov pa oxygen ua rau lub ntiaj teb tsis tshua muaj oxide, xws li cov tshuaj tiv thaiv ntawm neodymium thiab oxygen los tsim cov neodymium oxide. Tom qab oxidation ntawm tsawg lub ntiaj teb, cov khoom sib nqus ntawm cov khoom yuav raug txo kom tsawg. Yog li ntawd, thaum lub caij cov txheej txheem ntawm Nd-Fe-B cov ntaub ntawv, yuav ua li cas ua cov "oxidation tsis ua hauj lwm zoo" ua haujlwm yog qhov tseem ceeb ntawm txoj haujlwm zoo.
Ua ntej tshaj, thaum peb yuav cov ntaub ntawv raw, peb yuav tsum xyuas kom cov purity ntawm lub ntiaj teb tsis tshua muaj hlau thiab txo cov ntsiab lus oxygen. Thaum twg cov khoom siv, cov khoom yuav tsum muab ntim cov hnab yas thiab muab tso rau hauv lub thoob kom tsis txhob muaj cov pa phem nrog huab cua. Cov khoom uas muaj kev zoo siab yog muaj nitrogen los tiv thaiv thiab khi lub qhov ncauj ntawm lub hnab thaum cov khoom xyaw tas. Tsis txhob muab cov hlau neodymium me me thiab lwm yam khoom siv hauv ntiaj teb excessively vim lawv yuav oxidized tom qab thaum, xws li hlau neodymium puas paj liab, hlau praseodymium xa dawb thiab thiaj li.
Secondly, nyob rau hauv tus txheej txheem ntawm m elting, peb yuav tsum xyuas kom qhov chaw ntawm lub tshuab ua kom sov. Cov pwm tshiab, lub tshuab ua kom sov thiab cov cua sov yuav tsum tau qhuav ua ntej yuav nkag mus rau. Lub voj thiab qhov txuas ntawm lub tshuab cua sov yuav tsum tau ua kom zoo, kom tsis muaj cua, dej thiab roj yuav dim. Thiab lub tshuab nqus tsev twj (cav twj, keeb kwm twj thiab diffusion twj) yuav tsum ua haujlwm zoo. Nws yuav tsum tau kho thiab muab khaws cia rau hauv lub sijhawm. Lub tshuab nqus tsev vacuum yuav tsum tau muab ntxuav kom huv raws li cov cai tswj. Tsuas yog los ntawm kev ua cov ntsiab lus saum toj saud thiaj tuaj yeem nqa cov khoom nqus tsev rau hauv lub tshuab ua kom sov thiab yuav tsum ua kom zoo.
T nws ntxhib crushing, nruab nrab crushing, airflow sib tsoo thiab nplawm ntawm txoj kev milling yuav tsum tau kev tiv thaiv los ntawm nitrogen. Tshawb xyuas thiab txhawb ntxiv rau nitrogen ntawm lub phom tsis muaj steel (lub hnab yas) txhua lub sijhawm. Kuaj xyuas seb puas muaj qee qhov fais fab hlau tsis muaj steel valve lossis hnab yas ua ntej peb e. Yog tias nws ua, ces nws yuav tsum tau nyob hauv npoo e los yog them nrog lub hnab tshiab .Yog hais tias hmoov tau pom tias kub thaum lub sijhawm ua haujlwm, kev ntsuas txias xws li nitrogen them nyiaj yuav tsum tau txais los mus tiv thaiv oxidation.
Thaum txoj kev molding, peb yuav tsum tau them tag nrho cov pa oxygen ntawm lub thawv hmoov thiab nitrogen tiv thaiv lub thawv kom paub tseeb tias daim duab ntawm cov pro cess qis tshaj li tus kws kho kom thiaj li tiv thaiv tau oxidation ntawm hlau nplaum. Cov neeg ua haujlwm yuav tsum maj mam mus ua roj poob zis thiab xa cov ntaub ntawv no rau hauv qhov cub. Cov khoom ntawm kev ua tau zoo yog qhov tseem ceeb thiab yuav tsum tau siv rau hauv cov thawv tiv thaiv nitrogen raws li cov txheej txheem yuav tsum ua kom thiaj li tiv thaiv cov khoom lub pob zeb diamond thiab lub kaum sab ntug ntawm oxidation.
Tsis tas li ntawd, peb yuav tsum nco ntsoov ua tib zoo saib xyuas qhov tseeb ntawm kev siv argon, thiab daws cov teeb meem tsis txawv txav hauv lub sijhawm. Cov dej kub txias yuav tsum tau pom ntau zaus. Lub sijhawm txias yuav tsum tau qhia meej meej. Thaum kawg, qhov khoom tsis tuaj yeem tawm hauv qab 80 ℃ vim tias nws yuav tsum oxidized thaum kub.
Yog li ntawd, "anti oxidation" yog ib qho tseem ceeb ntawm peb txoj haujlwm ntawm kev ua haujlwm zoo ntawm NdFeB cov ntaub ntawv magnet. Peb yuav tsum pib ntawm kev ua hauj lwm tiag tiag thiab ua rau kev ua haujlwm nyuaj.