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Aneodymium hlau nplaum(tseem hu uaNdFeB,NIBlos yogNeomagnet) yog hom siv dav tshaj plawsrare ntiaj teb hlau nplaum.Nws yog ibhlau nplaum ruaj khovua los ntawm ibhlau alloyntawmneodymium,hlau, thiabboronlos form Nd2Fe14Btetragonalcrystalline qauv.Tsim los ntawm nws tus kheej hauv 1984 los ntawmGeneral MotorsthiabSumitomo Tshwj Xeeb Hlau, neodymium hlau nplaum yog hom muaj zog tshaj plaws ntawm cov hlau nplaum ruaj khov muaj nyob rau hauv kev lag luam.NdFeB hlau nplaum tuaj yeem raug faib ua sintered lossis sib txuas, nyob ntawm cov txheej txheem tsim khoom siv.Lawv tau hloov lwm hom hlau nplaum nyob rau hauv ntau daim ntawv thov nyob rau hauv cov khoom niaj hnub uas yuav tsum tau muaj zog ruaj khov hlau nplaum, xws lihluav taws xob motorshauv cov cuab yeej cordless,hard disk drivesthiab magnetic fasteners.
Cov khoom
Qib
Neodymium hlau nplaum raug muab qhab nia raws li lawvcov khoom siv hluav taws xob siab tshaj plaws, uas cuam tshuam rausib nqus fluxtso zis ib unit volume.Cov nqi siab dua qhia cov hlau nplaum muaj zog.Rau sintered NdFeB hlau nplaum, muaj kev lees paub thoob ntiaj teb kev faib tawm.Lawv qhov tseem ceeb ntawm N28 txog N55.Thawj tsab ntawv N ua ntej qhov tseem ceeb yog luv rau neodymium, lub ntsiab lus sintered NdFeB hlau nplaum.Cov ntawv tom qab qhov tseem ceeb qhia txog kev sib koom ua ke thiab kev ua haujlwm siab tshaj plaws (zoo sib xws nrog covCurie kub), uas nyob ntawm lub neej ntawd (txog 80 ° C lossis 176 ° F) mus rau TH (230 ° C lossis 446 ° F).
Qib ntawm sintered NdFeB hlau nplaum:
- N30 – N55
- N30M – N50M
- N30H – N50H
- N30SH - N48SH
- N30UH – N42UH
- N28EH – N40EH
- N28TH – N35TH
Cov khoom sib nqus
Qee cov khoom tseem ceeb siv los sib piv cov hlau nplaum ruaj khov yog:
- Remanence(Br), uas ntsuas lub zog ntawm magnetic teb.
- Kev quab yuam(Hci), cov khoom tiv thaiv los ua demagnetized.
- Cov khoom siv hluav taws xob siab tshaj plaws(BHmax), qhov ceev ntawm magnetic zog, tus yam ntxwv ntawm tus nqi siab tshaj ntawmmagnetic flux ceev(B) lub sijhawmmagnetic teb zog(H).
- Curie kub(TC), qhov kub ntawm cov khoom poob nws cov hlau nplaum.
Neodymium hlau nplaum muaj ntau dua remanence, ntau dua coercivity thiab zog khoom, tab sis feem ntau qis Curie kub dua lwm hom hlau nplaum.Tshwj xeeb neodymium hlau nplaum alloys uas suav nrogterbiumthiabdysprosiumtau tsim muaj qhov kub siab Curie siab dua, tso cai rau lawv ua kom sov siab dua. Cov lus hauv qab no piv qhov sib nqus kev ua tau zoo ntawm cov hlau nplaum neodymium nrog rau lwm hom hlau nplaum ruaj khov.
Lub cev thiab mechanical zog
| Khoom | Neodymium | Sm Co |
|---|---|---|
| Remanence(T) | 1–1.5 Nws | 0.8-1.16 Nws |
| Kev quab yuam(MA / m) | 0.875–2.79 Ib | 0.493–2.79 Ib |
| Recoil permeability | 1.05 Nws | 1.05–1.1 Nws |
| Kub coefficient ntawm remanence (% / K) | -(0.12–0.09) dr hab. | -(0.05–0.03) |
| Kub coefficient ntawm coercivity (% / K) | -(0.65–0.40) Nws. | -(0.30–0.15) dr hab. |
| Curie kub(°C) | 310–370 : kuv | 700–850 : kuv |
| Qhov ceev (g / cm3) | 7.3–7.7 Nws | 8.2–8.5 Nws |
| Thermal expansion coefficient, parallel rau magnetization (1 / K) | (3–4) × 10-6 | (5–9) × 10-6 |
| Thermal expansion coefficient, perpendicular rau magnetization (1 / K) | (1–3) × 10-6 | (10–13) × 10-6 |
| Flexural zog(N / hli2) | 200-400 Nws | 150–180 : kuv |
| Compressive zog(N / hli2) | 1000-1100 Nws | 800-1000 |
| Tensile zog(N / hli2) | 80–90 : kuv | 35–40 : kuv |
| Vickers hardness(HV) | 500-650 | 400–650 |
| Hluav taws xobtiv taus(Ω·cm) | (110-170) × 10-6 | (50–90) × 10-6 |
Post lub sij hawm: Jun-05-2023