NdFeB, raws li peb tiam tsis tshua muaj ntiaj teb cov khoom siv hlau nplaum ruaj khov, tau siv dav vim nws cov khoom sib nqus zoo heev. Txawm li cas los xij, NdFeB hlau nplaum kuj muaj qhov tsis zoo xws li Curie qhov kub thiab txias, qhov sib zog loj quab yuam kub coefficient, thiab cov tshuaj tsis zoo. Kev noj loj ntawm praseodymium, neodymium, dysprosium, thiab terbium tsawg lub ntiaj teb cov peev txheej tau ua rau tib neeg txhawj xeeb txog kev puas tsuaj ib puag ncig thiab kev ruaj ntseg ntawm cov peev txheej tsawg hauv ntiaj teb. Kev txhawj xeeb tsis tu ncua. Yog li ntawd, thaum cov kws tshaj lij cov ntaub ntawv sib nqus niaj hnub txhim kho kev ua tau zoo ntawm NdFeB cov khoom siv hlau nplaum ruaj khov, lawv tseem tab tom tsim lwm yam khoom siv hlau nplaum ruaj khov tshiab.
Xyoo 1990, Xib Fwb Coey los ntawm Ireland tau siv roj-khoom cov tshuaj tiv thaiv theem los ua ke RE2Fe17Nx interstitial atom intermetallic compounds. Los ntawm kev tshawb fawb, nws pom tias Sm2Fe17Nx cov tebchaw muaj cov khoom sib nqus zoo heev, tshaj tawm txog kev yug ntawm SmFeN cov khoom siv hlau nplaum tsis tshua muaj hauv ntiaj teb. Lub theoretical siab tshaj plaws sib nqus zog khoom ntawm samarium hlau nitrogen mus tas li hlau nplaum mus txog 62MGOe (me ntsis qis dua Nd2Fe14B, 64MGOe), thiab nws coercive quab yuam thiab Curie kub yog ntau dua li ntawm NdFeB, thiab yuav siv tau ntau lug siv nyob rau hauv high-kub ib puag ncig xws li raws li cov motors.
Ntxiv nrog rau cov khoom sib nqus zoo heev, samarium hlau nitrogen muaj kev tiv thaiv zoo corrosion thiab oxidation tsis kam, thiab tsis muaj cov ntsiab lus hlau zoo piv rau samarium cobalt; piv nrog neodymium hlau boron, tsis tas yuav siv cov khoom kim heev xws li praseodymium, neodymium, dysprosium, thiab terbium. cov ntsiab lus (samarium cov ntsiab lus yog qhov loj thiab tus nqi tsis siab), nws ua tau raws li cov xwm txheej los ua cov khoom siv hlau nplaum ruaj khov tshiab. Qhov kev cia siab txaus nyiam ua rau samarium hlau nitrogen ib zaug yog lub ntsiab lus kub tshaj plaws hauv kev tshawb fawb thiab kev tsim cov khoom siv hlau nplaum ruaj khov. Txij li thaum qhov kev tshawb pom ntawm Sm2Fe17Nx series tsis tshua muaj lub ntiaj teb cov khoom siv hlau nplaum ruaj khov los ntawm Coey li al., tau muaj kev nce sai hauv kev tshawb fawb Sm2Fe17Nx series cov khoom hlau nplaum ruaj khov thoob ntiaj teb. Lub sijhawm ntawd, ntau pua lub chaw kuaj mob thoob ntiaj teb tau koom nrog kev tshawb fawb hauv cheeb tsam no. Txawm li cas los xij, cov kev sim tom ntej tau ua pov thawj tias cov khoom siv hlau nplaum ruaj khov no tsis muaj kev vam meej ntawm txoj kev mus rau kev lag luam, thiab kev tshawb fawb tau kub thiab txias.
Nyob rau hauv xyoo tas los no, nrog rau kev loj hlob sai ntawm kev lag luam tsheb thiab kev ua haujlwm me me thiab lub teeb yuag ntawm cov khoom siv hluav taws xob, cov neeg tau muab tso rau pem hauv ntej siab dua ib puag ncig kev ua haujlwm kub thiab kev ua haujlwm sib nqus rau cov hlau nplaum ruaj khov. Sm2Fe17Nx series tsis tshua muaj lub ntiaj teb cov khoom siv hlau nplaum ruaj khov muaj qhov kub thiab txias thiab muaj peev xwm siv cov khoom siv hlau nplaum ruaj khov nrog kev ruaj ntseg thiab cov khoom sib nqus zoo heev tau ua rau tib neeg nyiam dua, thiab Sm2Fe17Nx series cov khoom siv hlau nplaum tas mus li tau coj los rau hauv kev tshawb fawb tshiab thiab kev loj hlob boom. . Vim tias tus nqi nce ntxiv los ntawm kev loj hlob thiab kev siv lub ntiaj teb tsis tshua muaj, tus nqi nce ntawm Nd tau ua rau nce nqi ntawm kev tsim Nd-Fe-B, thaum lub ntiaj teb tsis tshua muaj Sm nyob rau hauv lub xeev ntawm cov txheeb ze. nyiaj seem. Txoj kev loj hlob ntawm Sm-Fe-N yog qhov tsim nyog los txo cov nqi thiab ntxiv dag zog rau kev siv cov peev txheej tsawg hauv ntiaj teb. . Yog li ntawd, Sm-Fe-N zoo li yuav hloov Nd-Fe-B, ob qho tib si ntawm cov khoom sib nqus thiab cov nqi tsim khoom, thiab dhau los ua cov khoom siv hlau nplaum tsis tshua muaj ntiaj teb thib plaub uas tib neeg tab tom tos ntsoov.
Tom qab ntau tshaj 20 xyoo ntawm kev tshawb fawb thiab kev tshawb fawb, qhov teeb meem ntawm kev lag luam loj-loj ntau lawm ntawm Sm-Fe-N tseem tsis tau daws. Txoj kev tshawb nrhiav pom tias Sm-Fe-N decomposes rau hauv SmN thiab Fe ntawm qhov kub siab tshaj 873K thiab poob nws cov khoom sib nqus mus tas li. Rau qhov zoo, nws daim ntawv thov nyob rau hauv sintered hlau nplaum yog txwv. Sm-Fe-N tam sim no tsuas yog npaj txhaj tshuaj molded hlau nplaum, sib txuas hlau nplaum thiab roj hmab hlau nplaum. Thaum pib, cov khoom siv organic xws li nylon thiab epoxy resin tau siv los ua cov ntawv khi. Txij li cov binders no tsuas yog siv tau qis dua 200 degree, lawv tsis tuaj yeem siv rau lawv lub peev xwm. Sm2Fe17Nx muaj qhov zoo ntawm qhov ua tau zoo ntawm qhov kub thiab txias, yog li yuav ua li cas txhawm rau txhawm rau hauv kev siv tshuab thiab seb nws puas tuaj yeem tsim cov binders tshiab yog tus yuam sij rau kev sib tw ntawm Sm2Fe17Nx hlau nplaum thiab Nd-Fe-B hlau nplaum. Nyob rau hauv xyoo tas los no, qee qhov qis-melting-point hlau tau pib tau txais kev saib xyuas dav. Cov neeg siv cov hlau uas tsis tshua muaj melting point xws li Zn thiab Sn ua cov ntawv khi. Txawm li cas los xij, vim tias cov hlau tsis tshua muaj melting point xws li Zn yog siv los ua cov binders, lawv yuav txo qhov saturation magnetization siv, yog li ua rau (BH) max yog qis dua. Nws tuaj yeem pom tias txhawm rau muab kev ua si tag nrho rau qhov kev ua tau zoo ntawm Sm2Fe17Nx, nws yog ib qho tseem ceeb kom nrhiav tau tus khi zoo. Nyob rau tib lub sijhawm, kev npaj ntawm Sm2Fe17Nx densified hlau nplaum tseem tab tom nrhiav los ntawm cov kws tshawb fawb tshawb fawb, vim tias cov hlau nplaum densified tuaj yeem pom zoo dua theoretical magnetic zog.
Raws li kev txheeb cais los ntawm Nyiv Bonded Magnet Association, raws li kev ua tau zoo ntawm samarium hlau nitrogen cov khoom sib nqus xws li cov khoom sib nqus hlau, siab corrosion kuj, kub demagnetization tsis kam thiab zoo tsim kev ywj pheej, nws daim ntawv thov cov lus qhia yog nyob rau hauv cov ntaub ntawv kev sib txuas lus, muaj kev tsim khoom, thiab khoom siv hluav taws xob hauv tsev. Raws li lub tsheb thiab lwm yam kev lag luam, suav nrog cov hais lus / hais lus, lub koob yees duab shutter motors, spindle motors, disk adsorption, magnetic rollers, kiv cua motors, linear xyaw, tag nrho cov tshuab tsis siv neeg thiab khoom siv, high-speed motors, cua txias, tsev motors, sib nqus sensors, twj, auxiliary machinery, thiab lwm yam.
Tam sim no, Sm2Fe17Nx tau ua tiav zoo hauv kev npaj thiab siv cov hlau nplaum sib txuas, tab sis qhov ntom ntom tseem yog lub hom phiaj nrhiav thiab tawm tsam los ntawm ntau tus neeg ua haujlwm sib nqus. Thaum tsim cov txheej txheem npaj tsim nyog, nws yuav ua tiav nws. Theoretical magnetic zog ua kom cov txheej txheem kev lag luam ntawm samarium hlau nitrogen hlau nplaum.
