Hais txog Magnets

Neodymium Magnets yog dab tsi

Neodymium hlau nplaum (lub npe: NdFeb hlau nplaum) yog cov hlau nplaum uas muaj zog tshaj plaws nyob rau hauv kev lag luam, nyob txhua qhov chaw hauv ntiaj teb. Lawv muab cov qib sib txawv ntawm cov hlau nplaum tsis sib xws thiab kev tiv thaiv rau demagnetization thaum piv rau Ferrite, Alnico thiab txawm tias Samarium-cobalt hlau nplaum.
Neodymium hlau nplaum raug muab qhab nia raws li lawv cov khoom siv hluav taws xob siab tshaj plaws, uas cuam tshuam nrog cov khoom sib nqus flux tso tawm ib chav tsev ntim. 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 28 mus txog 55. Thawj tsab ntawv N ua ntej qhov tseem ceeb yog luv rau neodymium, lub ntsiab lus sintered NdFeB 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 nrog terbium thiab
dysprosium tau tsim muaj qhov kub siab Curie ntau dua, tso cai rau lawv ua kom sov siab dua.Cov lus hauv qab no piv cov kev sib nqus ntawm cov hlau nplaum neodymium nrog rau lwm hom hlau nplaum ruaj khov.

Dab tsi yog neodymium hlau nplaum siv rau? Vim yog cov hlau nplaum neodymium muaj zog heev, lawv siv tau dav heev. Lawv yog tsim los rau chaw ua hauj lwm, kev lag luam thiab kev lag luam xav tau, uas siv nyob rau hauv hom cua turbines,
hais lus, lub mloog pob ntseg thiab lub cev muaj zog, microphones, sensors, kev kho mob, ntim khoom, khoom siv ua kis las, khoom siv tes ua thiab kev lag luam aviation.

Dab tsi yog Ferrite Magnets

Ferrite Magnets dua li cov hlau nplaum tawv ferrite thiab cov hlau nplaum mos.
Hard ferrites muaj siab coercivity, yog li nyuaj rau demagnetize. Lawv tau siv los ua cov hlau nplaum ruaj khov rau cov ntawv thov xws li lub tub yees, lub suab nrov, thiab cov tshuab hluav taws xob me me thiab lwm yam.

Mos ferrites muaj coercivity tsawg, yog li lawv yooj yim hloov lawv magnetization thiab ua raws li conductors ntawm magnetic teb. Lawv tau siv nyob rau hauv kev lag luam hluav taws xob los ua kom muaj zog sib nqus cores hu ua ferrite cores rau high-frequency inductors, transformers thiab antennas, thiab nyob rau hauv ntau yam microwave Cheebtsam.

Ferrite compounds tsis tshua muaj nqi, ua los ntawm cov hlau oxide feem ntau, thiab muaj kev tiv thaiv corrosion zoo heev.
Dab tsi yog Alnico Magnets
Alnico hlau nplaum yog cov hlau nplaum ruaj khov uas feem ntau yog ua los ntawm kev sib xyaw ntawm txhuas, npib tsib xee thiab cobalt tab sis kuj tuaj yeem suav nrog tooj liab, hlau thiab titanium.
Lawv tuaj nyob rau hauv isotropic, non-directional, los yog anisotropic, mono-directional, daim ntawv. Thaum magnetized, lawv muaj 5 mus rau 17 npaug ntawm lub zog sib nqus ntawm magnetite lossis lodestone, uas yog cov khoom siv hlau nplaum uas nyiam hlau.
Alnico hlau nplaum muaj qhov kub tsis tshua muaj coefficient thiab tuaj yeem ntsuas qhov siab seem induction rau siv hauv cov ntawv thov kub siab txog li 930 ° F lossis 500 ° C. Lawv yog siv nyob rau qhov yuav tsum tau corrosion kuj thiab rau ntau hom sensors.

Dab tsi yog Samarium-cobalt Magnet (SmCo Magnet)

Cov hlau nplaum samarium-cobalt (SmCo) yog ib hom hlau nplaum uas tsis tshua muaj hauv ntiaj teb, yog cov hlau nplaum ruaj khov uas ua los ntawm ob lub ntsiab lus: Samarium thiab cobalt.Samarium-cobalt hlau nplaum feem ntau zoo ib yam li lub zog rau neodymium hlau nplaum, tab sis muaj qhov kub thiab txias. kev ntsuam xyuas thiab ntau dua coercivity.
Qee tus cwj pwm ntawm SmCo yog:
Samarium-cobalt hlau nplaum tsis tshua muaj resistant rau demagnetization.
Cov hlau nplaum no muaj qhov ntsuas kub zoo (qhov siab tshaj plaws siv ntawm 250 ° C (523 K) thiab 550 ° C (823 K); Curie kub ntawm 700 ° C (973 K) txog 800 ° C (1,070 K).
Lawv kim thiab raug tus nqi hloov pauv (cobalt yog tus nqi lag luam rhiab heev).
SmCo hlau nplaum muaj qhov muaj zog tiv thaiv corrosion thiab oxidation tsis kam, feem ntau tsis tas yuav coated thiab tuaj yeem siv dav hauv qhov kub thiab txias thiab ua haujlwm tsis zoo. Lawv yog nkig, thiab nquag tawg thiab chipping. Samarium-cobalt hlau nplaum muaj cov khoom siv hluav taws xob siab tshaj plaws (BHmax) uas muaj li ntawm 14 megagauss-oersteds (MGOe) txog 33 MG·Oe, uas yog kwv yees. 112 kJ / m3 txog 264 kJ / m3; Lawv txoj kev txwv yog 34 MG·Oe, txog 272 kJ / m3.
Lwm yam kev siv suav nrog:
1. High-end electric motors siv nyob rau hauv cov chav kawm sib tw ntau dua hauv slotcar sib twTurbomachinery.
2. Kev mus ncig-yoj lub raj hlau nplaum.
3. Cov ntawv thov uas yuav xav kom lub kaw lus ua haujlwm ntawm qhov kub thiab txias los yog kub heev (tshaj 180 ° C).
4. Cov ntawv thov uas yuav tsum tau ua kom ua tau raws li qhov kub thiab txias.
5. Benchtop NMR spectrometers.
6. Rotary encoders qhov twg nws ua haujlwm ntawm magnetic actuator.