Tau samarium cobalt hlau nplaum siv tau ntau tshaj kaum xyoo - lub sij hawm ntev stability ntawm samarium cobalt ntawm qhov kub thiab txias

Kev ruaj ntseg ntev ntawm cov hlau nplaum yog ib qho kev txhawj xeeb ntawm txhua tus neeg siv. Kev ruaj ntseg ntawm samarium cobalt (SmCo) hlau nplaum yog qhov tseem ceeb dua rau lawv qhov kev thov hnyav. Xyoo 2000, Chen^[1]thiab Liu^[2]thiab al., kawm txog cov muaj pes tsawg leeg thiab cov qauv ntawm high-temperature SmCo, thiab tsim high-temperature-resistant samarium-cobalt hlau nplaum. Qhov siab tshaj plaws ua haujlwm kub (T_max) ntawm SmCo hlau nplaum tau nce los ntawm 350 ° C mus rau 550 ° C. Tom qab ntawd, Chen et al. txhim kho oxidation tsis kam ntawm SmCo los ntawm kev tso nyiaj npib tsib xee, txhuas thiab lwm yam txheej txheej ntawm SmCo hlau nplaum.

Xyoo 2014, Dr. Mao Shoudong, tus tsim ntawm "MagnetPower", tau kawm txog kev ruaj ntseg ntawm SmCo ntawm qhov kub thiab txias, thiab cov txiaj ntsig tau luam tawm hauv JAP^[3]. Cov txiaj ntsig dav dav yog raws li hauv qab no:

1. ThaumSmCoyog nyob rau hauv lub xeev kub (500 ° C, huab cua), nws yog ib qho yooj yim los tsim ib tug degradation txheej ntawm qhov chaw. Cov txheej txheem degradation feem ntau yog tsim los ntawm cov nplai sab nraud (Samarium yog depleted) thiab txheej sab hauv (ntau cov oxides). Cov qauv yooj yim ntawm SmCo hlau nplaum raug rhuav tshem tag nrho hauv cov txheej txheem degradation. Raws li pom hauv daim duab 1 thiab daim duab 2.

Fig.1. Optical micrographs ntawm Sm₂Co₁₇Cov hlau nplaum isothermal kho hauv huab cua ntawm 500 ° C rau lub sijhawm sib txawv. Cov txheej degradation nyob rau hauv cov chaw uas yog (a) parallel thiab (b) perpendicular mus rau c-axis.

Fig.2. BSE micrograph thiab EDS cov kab-scan hla Sm₂Co₁₇Cov hlau nplaum isothermal kho hauv huab cua ntawm 500 ° C rau 192 h.

2. Lub ntsiab tsim ntawm cov txheej degradation cuam tshuam rau cov khoom sib nqus ntawm SmCo, raws li qhia hauv daim duab 3. Cov txheej txheem degradation feem ntau yog tsim los ntawm Co(Fe) cov tshuaj, CoFe2O4, Sm2O3, thiab ZrOx nyob rau hauv cov khaubncaws sab nraud povtseg thiab Fe3O4, CoFe2O4, thiab CuO hauv cov nplai sab nraud. Cov Co(Fe), CoFe2O4, thiab Fe3O4 ua raws li cov qib sib nqus mos piv rau lub zog sib nqus ntawm lub hauv paus tsis cuam tshuam Sm2Co17 hlau nplaum. Tus cwj pwm degradation yuav tsum tau tswj.

Fig. 3. Cov kab hlau nplaum ntawm Sm₂Co₁₇Cov hlau nplaum isothermal kho hauv huab cua ntawm 500 ° C rau lub sijhawm sib txawv. Qhov ntsuas kub ntawm cov hlau nplaum nkhaus yog 298 K. Qhov chaw sab nraud H piv rau c-axis alignment ntawm Sm₂Co₁₇hlau nplaum.

3. Yog tias cov coatings uas muaj kev tiv thaiv oxidation siab yog tso rau ntawm SmCo los hloov cov txheej txheem electroplating qub, cov txheej txheem degradation ntawm SmCo tuaj yeem cuam tshuam ntau dua thiab kev ruaj ntseg ntawm SmCo tuaj yeem txhim kho, raws li qhia hauv daim duab 4.LOSSIS txheejho inhibit qhov hnyav nce ntawm SmCo thiab poob ntawm cov khoom sib nqus.

Fig.4 tus qauv ntawm oxidation kuj LOSSIS txheej ntawm Sm₂Co₁₇hlau nplaum.

"MagnetPower" txij li tau ua qhov kev sim ntawm kev ruaj ntseg mus sij hawm ntev (~ 4000hours) ntawm qhov kub thiab txias, uas tuaj yeem muab kev ruaj ntseg siv SmCo hlau nplaum rau yav tom ntej siv ntawm qhov kub thiab txias.

Hauv xyoo 2021, raws li qhov xav tau ntawm kev ua haujlwm siab tshaj plaws, "MagnetPower" tau tsim cov qib ntawm 350 ° C txog 550 ° C (T series). Cov qib no tuaj yeem muab cov kev xaiv txaus rau cov ntawv thov SmCo kub, thiab cov khoom sib nqus tau zoo dua. Raws li pom hauv daim duab 5. Thov xa mus rau lub vev xaib kom paub meej:https://www.magnetpower-tech.com/t-series-sm2co17-smco-magnet-supplier-product/

Fig.5 Qhov kub siab SmCo hlau nplaum (T series) ntawm "MagnetPower"

Cov lus xaus

1. Raws li lub ntiaj teb tsis tshua muaj cov hlau nplaum ruaj khov, SmCo tuaj yeem siv rau qhov kub siab (≥350 ° C) rau lub sijhawm luv luv. Qhov kub siab SmCo (T series) tuaj yeem siv rau ntawm 550 ° C yam tsis muaj demagnetization irreversible.

2. Txawm li cas los xij, yog tias cov hlau nplaum SmCo tau siv los ntawm qhov kub siab (≥350 ° C) rau lub sijhawm ntev, qhov saum npoo yuav ua rau cov txheej txheem degradation. Kev siv cov tshuaj tiv thaiv oxidation tuaj yeem ua kom ruaj khov ntawm SmCo ntawm qhov kub thiab txias.

Kev siv

[1] CHChen, IEEE Transactions on Magnetics, 36, 3291-3293, (2000);

[2] JF Liu, Journal of Applied Physics, 85, 2800-2804, (1999);

[3] Shoudong Mao, Journal of Applied Physics, 115, 043912,1-6 (2014)