Ngaba imagnethi ye-samarium cobalt ingasetyenziselwa iminyaka engaphezu kweshumi--uzinzo olude lwe-samarium cobalt kwiqondo lokushisa eliphezulu

Uzinzo lwexesha elide lweemagnethi luyinkxalabo yakhe wonke umsebenzisi. Uzinzo lwemagnethi ye-samarium cobalt (SmCo) ibaluleke ngakumbi kwimeko yazo yesicelo esiqatha. Kwi-2000, uChen^[1]kunye noLiu^[2]et al., funda ukubunjwa kunye nolwakhiwo lwe-SmCo yobushushu obuphezulu, kunye nokuphuhlisa imagnethi yesamarium-cobalt yokumelana nobushushu obuphezulu. Obona bushushu buphezulu bokusebenza (T_max) yeemagnethi ze-SmCo zonyuswa ukusuka kuma-350°C ukuya kuma-550°C. Emva koko, uChen et al. iphucule ukuxhathisa kwi-oxidation ye-SmCo ngokufaka i-nickel, i-aluminiyam kunye nezinye iingubo kwiimagnethi ze-SmCo.

Kwi-2014, uDkt. Mao Shoudong, umsunguli we "MagnetPower", wafunda ngokucwangcisiweyo ukuzinza kweSmCo kumaqondo aphezulu, kwaye iziphumo zapapashwa kwiJAP.^[3]. Iziphumo jikelele zezi zilandelayo:

1. NiniSmCoikwimo yobushushu obuphezulu (500°C, umoya), kulula ukwenza umaleko wokuthotywa phezu komhlaba. Uluhlu lokunciphisa ubukhulu becala luqulunqwe kwinqanaba langaphandle (i-Samarium iyancipha) kunye nomgangatho wangaphakathi (uninzi lwe-oxides). Ulwakhiwo olusisiseko lweemagnethi ze-SmCo lwatshatyalaliswa ngokupheleleyo kumaleko wokuthotywa. Njengoko kubonisiwe kuMfanekiso 1 kunye noMfanekiso 2.

Isazobe.1. Iimicrographs zamehlo ze-Sm₂Co₁₇iimagnethi isothermal ephathwa emoyeni kwi-500 °C ngamaxesha ahlukeneyo. Iileyile zokuthotywa phantsi komphezulu (a) zinxuseneyo kunye (b) ne-perpendicular kwi-axis engu-c.

Isazobe.2. I-micrograph ye-BSE kunye neelementi ze-EDS umgca wokuskena kuyo yonke i-Sm₂Co₁₇iimagnethi ziphathwa emoyeni kwi-500 °C kwi-192 h.

2. Ukwakhiwa okuphambili komgangatho wokuthotywa kuchaphazela kakhulu iipropati zemagneti ze-SmCo, njengoko kuboniswe kuMzobo 3. Iingqimba zokuthotywa zaye zaqulunqwa ngokukodwa kwi-Co (Fe) isisombululo esiqinileyo, i-CoFe2O4, i-Sm2O3, kunye ne-ZrOx kwiileya zangaphakathi kunye ne-Fe3O4, I-CoFe2O4, kunye ne-CuO kwizikali zangaphandle. I-Co (Fe), i-CoFe2O4, kunye ne-Fe3O4 zisebenze njengezigaba ezithambileyo zemagneti xa kuthelekiswa nesigaba semagnethi esinzima semagnethi engachaphazelekiyo ye-Sm2Co17. Ukuziphatha kokuthotywa kufuneka kulawulwe.

Isazobe 3. Iigophe zemagneti zeSm₂Co₁₇iimagnethi isothermal ephathwa emoyeni kwi-500 °C ngamaxesha ahlukeneyo. Ubushushu bovavanyo lweegophe zemagnetization yi-298 K. Intsimi yangaphandle H ihambelana nokulungelelaniswa kwe-c-axis ye-Sm.₂Co₁₇imagnethi.

3. Ukuba iingubo ezinokumelana ne-oxidation ephezulu zifakwe kwi-SmCo yokubuyisela i-electroplating yoqobo, inkqubo yokuthotywa kwe-SmCo inokuthintelwa kakhulu kwaye uzinzo lwe-SmCo lunokuphuculwa, njengoko kubonisiwe kuMfanekiso 4.OKANYE ukutyabekakuthintela kakhulu ukwanda kobunzima be-SmCo kunye nokulahleka kweempawu zemagneti.

Umzobo.4 ulwakhiwo lokumelana ne-oxidation OKANYE ukugquma kwi-Sm₂Co₁₇umazibuthe.

"I-MagnetPower" ukusukela oko iqhube imifuniselo yozinzo lwexesha elide (~ 4000hours) kubushushu obuphezulu, obunokubonelela ngereferensi yozinzo lweemagnethi zeSmCo zokusetyenziswa kwixesha elizayo kumaqondo obushushu aphezulu.

Ngo-2021, ngokusekwe kowona mgangatho uphezulu wobushushu obufunekayo, i-“MagnetPower” iphuhlise uthotho lwamabakala ukusuka ku-350°C ukuya ku-550°C.T series） La mabanga anokubonelela ngokukhetha okwaneleyo kwisicelo seSmCo sobushushu obuphezulu, kunye neempawu zemagneti zinenzuzo ngakumbi. Njengoko kubonisiwe kuMfanekiso 5. Nceda ujonge kwiphepha lewebhu ngeenkcukacha:https://www.magnetpower-tech.com/t-series-sm2co17-smco-magnet-supplier-product/

Fig.5 Ubushushu obuphezulu bemagnethi ye-SmCo (uthotho lwe-T) ye "MagnetPower"

IZIGQIBO

1. Njengoko uzinzile kakhulu kunqabile iimagnethi emhlabeni esisigxina, SmCo ingasetyenziswa kwiqondo lobushushu eliphezulu (≥350 ° C) ixesha elifutshane. Iqondo lobushushu eliphezulu SmCo (T series) ingafakwa 550 °C ngaphandle demagnetization irreversible.

2. Nangona kunjalo, ukuba iimagnethi ze-SmCo zazisetyenziswa kwiqondo lokushisa eliphezulu (≥350 ° C) ixesha elide, umphezulu ulungele ukuvelisa umaleko wokuthotywa. Ukusetyenziswa kwe-anti-oxidation coating kunokuqinisekisa ukuzinza kwe-SmCo kwiqondo lokushisa eliphezulu.

Isalathiso

[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)