Cov hlau nplaum tau los ntev heev txij li hnub koj tseem hluas thaum koj siv sijhawm teev los npaj cov xim zoo nkauj ntawm cov ntawv hlau nplaum rau koj niam lub qhov rooj tub yees.Niaj hnub no cov hlau nplaum muaj zog dua puas tau thiab lawv ntau yam ua rau lawv muaj txiaj ntsig zoo rau ntau yam kev siv.
Lub ntiaj teb tsis tshua muaj thiab cov hlau nplaum ceramic - tshwj xeeb tshaj yog cov hlau nplaum loj hauv ntiaj teb - tau hloov pauv ntau yam kev lag luam thiab kev lag luam los ntawm kev nthuav dav cov ntawv thov lossis ua rau cov ntawv thov uas twb muaj lawm.Txawm hais tias ntau tus tswv lag luam paub txog cov hlau nplaum no, kev nkag siab qhov ua rau lawv txawv tuaj yeem ua rau tsis meej pem.Nov yog qhov nrawm nrawm ntawm qhov sib txawv ntawm ob hom hlau nplaum, nrog rau cov ntsiab lus ntawm lawv cov txheeb ze zoo thiab qhov tsis zoo:
Lub ntiaj teb tsis tshua muaj
Cov hlau nplaum muaj zog heev no tuaj yeem tsim los ntawm neodymium lossis samarium, ob qho tib si ntawm cov khoom siv lanthanide series ntawm cov ntsiab lus.Samarium tau siv thawj zaug hauv xyoo 1970, nrog cov hlau nplaum neodymium los siv rau xyoo 1980s.Ob qho tib si neodymium thiab samarium yog cov hlau nplaum tsis tshua muaj zog hauv ntiaj teb thiab siv rau hauv ntau daim ntawv thov kev lag luam nrog rau cov turbines muaj zog tshaj plaws thiab cov tshuab hluav taws xob nrog rau cov ntawv thov kev tshawb fawb.
Neodymium
Qee zaum hu ua NdFeB hlau nplaum rau cov khoom uas lawv muaj - neodymium, hlau thiab boron, lossis tsuas yog NIB - neodymium hlau nplaum yog cov hlau nplaum muaj zog tshaj plaws.Cov khoom siv hluav taws xob siab tshaj plaws (BHmax) ntawm cov hlau nplaum no, uas sawv cev rau lub zog tseem ceeb, tuaj yeem ua tau ntau dua 50MGOe.
Qhov siab BHmax - kwv yees li 10 npaug siab dua li cov hlau nplaum ceramic - ua rau lawv zoo tagnrho rau qee qhov kev siv, tab sis muaj kev lag luam tawm: neodymium muaj qhov tsis zoo rau thermal stress, uas txhais tau hais tias thaum nws tshaj qhov kub thiab txias, nws yuav poob nws lub peev xwm. ua haujlwm.Lub Tmax ntawm neodymium hlau nplaum yog 150 degrees Celsius, txog ib nrab ntawm samarium cobalt lossis ceramic.(Nco ntsoov tias qhov kub thiab txias ntawm cov hlau nplaum poob lawv lub zog thaum raug tshav kub tuaj yeem sib txawv me ntsis raws li cov hlau nplaum.)
Cov hlau nplaum kuj tuaj yeem muab piv raws li lawv Tcurie.Thaum cov hlau nplaum tau rhuab mus rau qhov kub siab tshaj lawv Tmax, feem ntau lawv tuaj yeem rov qab txias dua;Tcurie yog qhov kub tshaj qhov kev rov qab tsis tuaj yeem tshwm sim.Rau cov hlau nplaum neodymium, Tcurie yog 310 degrees Celsius;Cov hlau nplaum neodymium rhuab mus rau lossis dhau qhov ntsuas kub yuav tsis tuaj yeem rov qab ua haujlwm thaum txias.Ob qho tib si samarium thiab ceramic hlau nplaum muaj ntau dua Tcuries, uas ua rau lawv xaiv zoo dua rau kev siv cua sov.
Neodymium hlau nplaum yog qhov tsis tshua muaj zog los ua demagnetized los ntawm sab nraud magnetic teb, tab sis lawv nyiam xeb thiab cov hlau nplaum feem ntau yog coated los tiv thaiv corrosion.
Samarium Cobalt
Samarium cobalt, lossis SaCo, hlau nplaum tau muaj nyob rau xyoo 1970, thiab txij li ntawd los, lawv tau siv ntau yam kev siv.Txawm hais tias tsis muaj zog npaum li cov hlau nplaum neodymium - samarium cobalt hlau nplaum feem ntau muaj BHmax txog 26 - cov hlau nplaum no muaj qhov zoo ntawm qhov muaj peev xwm tiv taus qhov kub siab dua li cov hlau nplaum neodymium.Lub Tmax ntawm samarium cobalt hlau nplaum yog 300 degrees Celsius, thiab Tcurie tuaj yeem ua ntau li 750 degrees Celsius.Lawv cov txheeb ze lub zog ua ke nrog lawv lub peev xwm tiv taus qhov kub thiab txias ua rau lawv zoo tagnrho rau cov ntawv thov kub kub.Tsis zoo li cov hlau nplaum neodymium, samarium cobalt hlau nplaum muaj qhov zoo tiv thaiv corrosion;lawv kuj yuav muaj tus nqi siab dua li cov hlau nplaum neodymium.
Ceramic
Ua los ntawm barium ferrite lossis strontium, cov hlau nplaum ceramic tau nyob ib puag ncig ntev dua li cov hlau nplaum hauv ntiaj teb tsis tshua muaj thiab tau siv thawj zaug hauv xyoo 1960.Cov hlau nplaum ceramic feem ntau tsis tshua kim dua li cov hlau nplaum hauv ntiaj teb tsis tshua muaj tab sis lawv tsis muaj zog nrog BHmax li ntawm 3.5 - txog ib feem kaum lossis tsawg dua li ntawm neodymium lossis samarium cobalt hlau nplaum.
Hais txog cua sov, cov hlau nplaum ceramic muaj Tmax ntawm 300 degrees Celsius thiab, zoo li samarium hlau nplaum, Tcurie ntawm 460 degrees Celsius.Cov hlau nplaum ceramic yog cov resistant rau corrosion thiab feem ntau tsis tas yuav muaj kev tiv thaiv txheej.Lawv yooj yim rau magnetize thiab kuj tseem kim dua neodymium lossis samarium cobalt hlau nplaum;Txawm li cas los xij, cov hlau nplaum ceramic yog nkig heev, ua rau lawv xaiv tsis zoo rau cov ntawv thov cuam tshuam nrog kev hloov pauv lossis kev ntxhov siab.Cov hlau nplaum ceramic feem ntau yog siv rau kev ua qauv qhia hauv chav kawm thiab tsis muaj zog ntawm kev lag luam thiab kev lag luam, xws li cov tshuab hluav taws xob qis lossis cov turbines.Lawv kuj tseem siv tau rau hauv cov ntawv thov hauv tsev thiab hauv kev tsim cov nplooj ntawv sib nqus thiab cov paib.
Post lub sij hawm: Mar-09-2022
