Ferrite Lub tog raj kheej Magnet

Ferrite Lub tog raj kheej Magnet

Kev siv thiab ntau yam ntawm cov khoom siv hlau nplaum ferrite tau nce nrog kev tsim khoom. Raws li daim ntawv thov, ferrite tuaj yeem muab faib ua tsib pawg: mos sib nqus, tawv sib nqus, gyromagnetic, lub sijhawm sib nqus thiab piezo magnetic.

Cov khoom sib nqus mos yog hais txog cov khoom siv ferrite uas yooj yim rau kev sib nqus thiab demagnetize nyob rau hauv ib qho chaw tsis muaj zog hlau nplaum (raws li qhia hauv daim duab 1). Cov neeg sawv cev ntawm cov khoom sib nqus mos yog manganese zinc ferrite Mn-ZnFe₂O₄thiab nickel zinc ferrite Ni-ZnFe₂O₄.

Mos sib nqus ferrite yog cov khoom siv ferrite nrog rau daim ntawv thov dav, ntau qhov ntau, ntau yam thiab cov nqi tso tawm siab ntawm ntau yam ferrites. Tam sim no, muaj ntau ntau yam uas tsim nyob rau hauv batch nyob rau hauv lub ntiaj teb no, thiab cov khoom txhua xyoo tau mus txog ntau tshaj kaum tawm txhiab tons.

Mos ferrite feem ntau yog siv los ua ntau yam inductance Cheebtsam, xws li lim cores, transformer cores, kav hlau txais xov cores, deflection cores, sib nqus daim kab xev kaw thiab video taub hau, thiab kaw lub taub hau rau ntau txoj kev sib txuas lus.

Feem ntau, cov qauv siv lead ua ntawm mos ferrite yog cubic spinel hom, uas yog siv nyob rau hauv lub suab zaus mus rau cov zaus band (1 kHz-300 MHz). Txawm li cas los xij, qhov txwv sab saud ntawm daim ntawv thov zaus ntawm cov khoom sib nqus mos nrog lub hexagonal magnetoplumbite crystal qauv yog ob peb zaug siab dua li ntawm hom spinel.

Cov khoom siv hlau nplaum nyuaj yog txheeb ze rau cov khoom sib nqus mos. Nws hais txog cov khoom siv ferrite uas tsis yooj yim rau demagnetize tom qab magnetization, tab sis tuaj yeem khaws cov hlau nplaum ntev ntev. Yog li ntawd, nws kuj yog qee zaum hu ua cov khoom sib nqus ruaj khov lossis cov khoom sib nqus ruaj khov).

Cov qauv siv lead ua ntawm cov khoom sib nqus nyuaj yog feem ntau hexagonal magnetoplumbite hom. Nws tus neeg sawv cev yog barium ferrite BaFe₁₂O₁₉(tseem hu ua barium tas li porcelain, barium magnetic porcelain), uas yog cov khoom siv hlau nplaum ferrite nrog kev ua tau zoo, tus nqi qis thiab tsim nyog rau kev tsim khoom.

Cov khoom siv no tuaj yeem siv tsis tau tsuas yog siv lub kaw lus, lub microphone, khaws cia, xov tooj, thiab cov hlau nplaum rau ntau yam cuab yeej hauv kev sib txuas lus, tab sis nws kuj yog siv rau hauv kev kho cov pa phem, kev kho mob biology, thiab luam ntawv.

Cov khoom siv ferrite nyuaj yog qhov thib ob tseem ceeb ntawm cov khoom siv hlau nplaum tom qab cov khoom siv hlau nplaum nyuaj ntawm Al-Ni series. Cov khoom siv tshuab, cov khoom siv microwave, thiab lwm yam khoom siv tiv thaiv) qhib txoj hauv kev tshiab rau kev siv.

Lub gyromagnetism ntawm cov khoom sib nqus txhais tau hais tias nyob rau hauv qhov kev txiav txim ntawm ob qho tib si perpendicular DC magnetic teb thiab electromagnetic yoj magnetic teb, thaum lub dav hlau-polarized electromagnetic yoj propagates nyob rau hauv ib tug tej yam kev taw qhia nyob rau hauv cov khoom, nws polarization dav hlau yuav tsis tu ncua rotate nyob ib ncig ntawm cov kev taw qhia ntawm propagation. . Phenomenon, hom khoom siv gyromagnetic yog hu ua gyromagnetic khoom.

Nyob rau hauv qhov kev txiav txim ntawm DC magnetic teb thiab electromagnetic yoj magnetic teb, thaum lub dav hlau-polarized electromagnetic yoj propagates nyob rau hauv ib tug tej yam kev taw qhia nyob rau hauv cov khoom, nws polarization dav hlau yuav tsis tu ncua tig ib ncig ntawm lub propagation kev taw qhia. Cov khoom siv gyromagnetic no yog hu ua gyromagnetic khoom. Txawm hais tias cov khoom siv hlau nplaum H kuj tseem muaj gyromagnetism, vim qhov kev tiv thaiv me me thiab qhov poob loj heev tam sim no, electromagnetic yoj tsis tuaj yeem nkag mus rau sab hauv, tab sis tsuas yog nkag mus rau ntawm daim tawv nqaij nrog lub thickness tsawg dua 1 micron (tseem hu ua cov nyhuv ntawm daim tawv nqaij), yog li nws tsis tuaj yeem siv. Yog li ntawd, daim ntawv thov ntawm gyromagnetism nyob rau hauv cov khoom sib nqus tau dhau los ua ib qho chaw tshwj xeeb ntawm ferrite.

Qhov tshwm sim gyromagnetic yog siv nyob rau hauv lub band ntawm 100 ~ 100, 000 MHz (los yog nyob rau hauv qhov ntau ntawm 'meter' yoj mus millimeter yoj), yog li cov khoom siv ferrite gyromagnetic tseem hu ua microwave ferrite. Feem ntau siv microwave ferrites suav nrog magnesium manganese ferrite Mg-MnFe₂O₄, npib tsib xee tooj liab ferrite Ni-CuFe₂O₄, nickel zinc ferrite Ni-ZnFe2O4 thiab yttrium garnet ferrite 3Me₂O₃5 Fe₂O₃(Kuv yog lub ntiaj teb tsis tshua muaj hlau Ions, xws li Y^{3 plus ib}, Sm^{3 plus ib}, Gd^{3 plus ib}, Dy^{3 plus ib}, thiab lwm yam)

Feem ntau ntawm cov khoom siv gyromagnetic yog waveguides lossis cov kab sib kis uas xa cov microwaves los ua ntau yam khoom siv microwave, uas yog siv rau hauv cov khoom siv hluav taws xob xws li radar, kev sib txuas lus, navigation, telemetry, thiab cov chaw taws teeb tswj. Cov cuab yeej siv microwave feem ntau yog siv rau hauv cov khoom siv hluav taws xob xws li radar, kev sib txuas lus, navigation, telemetry, thiab cov chaw taws teeb tswj.

Lub sijhawm sib nqus cov khoom siv yog hais txog cov khoom siv ferrite nrog lub voj voos hysteresis, raws li pom hauv daim duab 4. Hysteresis voj txhais tau tias tom qab sab nraud magnetic teb nce mus rau saturation field zog ntxiv rau Hs, los ntawm ntxiv Hs rau -Hs thiab tom qab ntawd rov qab mus ntxiv. Hs, qhov sib nqus induction ntawm cov khoom sib nqus kuj hloov los ntawm ntxiv Bs mus rau - Bs rov qab mus rau ntxiv Bs dua, kaw lub voj nkhaus tau ntsib. Cov khoom siv tam sim no feem ntau siv yog magnesium manganese ferrite Mg-MnFe2O4 thiab lithium manganese ferrite Li-MnFe2O4.

Cov khoom siv no feem ntau yog siv los ua lub cim xeeb ntawm ntau hom hluav taws xob hauv computer, thiab kuj tau siv dav hauv kev tswj tsis siv neeg, radar navigation, chaw navigation, cov ntaub ntawv tso saib, thiab lwm yam.

Txawm hais tias muaj ntau yam tshiab ntawm kev nco, magnetic nco (tshwj xeeb tshaj yog sib nqus core nco) tseem nyob hauv txoj haujlwm tseem ceeb hauv kev siv thev naus laus zis vim muaj ntau cov ntaub ntawv raw, cov txheej txheem yooj yim, kev ua haujlwm ruaj khov thiab cov nqi qis ntawm ferrite lub sij hawm sib nqus.

Cov ntaub ntawv piezomagnetic xa mus rau cov khoom siv ferrite uas tuaj yeem ua haujlwm ntev lossis luv luv (magnetostrictive) nyob rau hauv cov kev taw qhia ntawm magnetic teb thaum magnetized. Tam sim no feem ntau siv yog npib tsib xee-zinc ferrite Ni-ZnFe₂O₄, nickel-tooj ​​liab ferrite Ni-CuFe₂O₄thiab nickel-magnesium ferrite Ni-MgFe₂O₄thiab lwm yam.

Piezomagnetic cov ntaub ntawv yog tsuas yog siv nyob rau hauv ultrasonic thiab underwater acoustic li, magneto-acoustic li, telecommunication pab kiag li lawm, underwater TVs, hluav taws xob computers thiab tsis siv neeg tswj cov cuab yeej uas hloov electromagnetic zog thiab txhua yam zog.

Txawm hais tias piezoelectric cov ntaub ntawv thiab piezoelectric ceramic cov ntaub ntawv (xws li barium titanate, thiab lwm yam) muaj yuav luag tib daim ntawv thov teb, lawv tau siv nyob rau hauv txawv tej yam kev mob vim lawv txawv cov yam ntxwv. Nws yog feem ntau ntseeg hais tias ferrite piezomagnetic cov ntaub ntawv tsuas yog haum rau cov zaus band ntawm kaum tawm txhiab tus hertz, thaum lub sij hawm siv band ntawm piezoelectric ceramics yog ntau dua.

Ntxiv rau qhov kev faib tawm saum toj no los ntawm kev siv, ferrite tuaj yeem muab faib ua Ni-Zn, Mn-Zn, Cu-Zn ferrite, thiab lwm yam raws li nws cov tshuaj muaj pes tsawg leeg. Ferrites nrog tib cov tshuaj muaj pes tsawg leeg (series) tuaj yeem siv ntau yam. Piv txwv li, Ni-Zn ferrite tuaj yeem siv los ua cov khoom sib nqus mos, gyromagnetic lossis piezomagnetic cov ntaub ntawv, tab sis muaj qhov sib txawv ntawm cov qauv thiab cov txheej txheem. Tsuas yog hloov.