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Saina kana Gadzira Akaundi
Aneodymium magineti(inozivikanwawo seNdFeB,NIBkanaNeomagnet) ndiyo inonyanya kushandiswa mhando yeisingawanzo-yepasi magineti.Zviri azvachose maginetiyakagadzirwa kubva kunealloyyeneodymium,iron,uyeboronkugadzira Nd2Fe14Btetragonalcrystalline chimiro.Yakagadzirwa yakazvimirira muna 1984 naGeneral MotorsuyeZvimwe zveSumitomo Special Metals, neodymium magineti imhando yakasimba yemagineti yechigarire inowanikwa mukutengesa.NdFeB magineti anogona kuverengerwa senge akasungirirwa kana kusungirirwa, zvichienderana nemaitiro ekugadzira anoshandiswa.Vakatsiva mamwe marudzi emagineti mune akawanda maapplication muzvigadzirwa zvemazuva ano zvinoda magineti akasimba echigarire, sengemota dzemagetsimumidziyo isina tambo,hard disk drivesuye magnetic fasteners.
Properties
MaGrades
Neodymium magineti akaiswa magiredhi zvinoenderana neawoyakanyanya simba chigadzirwa, izvo zvinoenderana nemagnetic fluxkubuda pavhoriyamu yeyuniti.Hunhu hwepamusoro hunoratidza magineti akasimba.Kune sintered NdFeB magineti, kune inozivikanwa zvakanyanya pasi rose kupatsanura.Hunhu hwavo hunobva paN28 kusvika kuN55.Vara rekutanga N risati rakosha ipfupi kune neodymium, zvichireva kuti sintered NdFeB magineti.Mabhii anotevera maitiro anoratidza kumanikidzwa kwemukati uye yakanyanya tembiricha yekushanda (yakabatana zvakanaka neCurie tembiricha), iyo inotangira payakagadzika (kusvika pa80 °C kana 176 °F) kusvika paTH (230 °C kana 446 °F).
Magiredhi e sintered NdFeB magineti:
- N30 – N55
- N30M – N50M
- N30H – N50H
- N30SH – N48SH
- N30UH – N42UH
- N28EH – N40EH
- N28TH – N35TH
Magnetic properties
Zvimwe zvakakosha zvivakwa zvinoshandiswa kuenzanisa magineti echigarire ndeaya:
- Remanence(Br), iyo inoyera simba remagineti.
- Coercivity(Hci), kuramba kwezvinhu zvacho kuti zvisave demagnetized.
- Maximum simba chigadzirwa(BHmax), kuwanda kwesimba remagineti, rinoratidzwa nehuwandu hunokosha hwemagnetic flux density(B) nguvamagnetic field simba(H).
- Curie tembiricha(TC), tembiricha iyo chinhu chinorasikirwa nemagnetism.
Neodymium magineti ane remanence yakakwirira, yakanyanya kumanikidza uye chigadzirwa chesimba, asi kazhinji inodzika tembiricha yeCurie kupfuura mamwe marudzi emagineti.Special neodymium magineti alloys anosanganisiraterbiumuyedysprosiumdzakagadzirwa dzine tembiricha yakakwira Curie, ichivabvumira kushivirira tembiricha yakakwira. Tafura iri pazasi inofananidza kuita kwemagineti kweneodymium magineti nemamwe marudzi emagineti echigarire.
Zvenyama uye zvemagetsi zvivakwa
| Property | Neodymium | Sm-Co |
|---|---|---|
| Remanence(T) | 1–1.5 | 0.8–1.16 |
| Coercivity(MA/m) | 0.875–2.79 | 0.493–2.79 |
| Recoil permeability | 1.05 | 1.05–1.1 |
| Tembiricha coefficient of remanence (%/K) | −(0.12–0.09) | −(0.05–0.03) |
| Tembiricha coefficient of coercivity (%/K) | −(0.65–0.40) | −(0.30–0.15) |
| Curie tembiricha(°C) | 310–370 | 700–850 |
| Density (g/cm3) | 7.3–7.7 | 8.2–8.5 |
| Thermal kuwedzera coefficient, kufambirana nemagnetization (1/K) | (3–4)×10−6 | (5–9)×10−6 |
| Thermal kuwedzera coefficient, perpendicular to magnetization (1/K) | (1–3)×10−6 | (10–13)×10−6 |
| Flexural simba(N/mm2) | 200–400 | 150–180 |
| Kudzvinyirira simba(N/mm2) | 1000–1100 | 800–1000 |
| Kusimba simba(N/mm2) | 80–90 | 35–40 |
| Vickers kuoma(HV) | 500–650 | 400–650 |
| Zvemagetsiresistivity(Ω·cm) | (110–170)×10−6 | (50–90)×10−6 |
Nguva yekutumira: Jun-05-2023