Kugwiritsa ntchito kwa Rare Earth Oxide mu MLCC

Ceramic formula powder ndiye maziko a MLCC, omwe amawerengera 20% ~ 45% ya mtengo wa MLCC. Makamaka, mkulu-mphamvu MLCC ali zofunika okhwima pa chiyero, tinthu kukula, granularity ndi morphology wa ufa ceramic, ndi mtengo wa ceramic ufa nkhani kwa gawo ndi apamwamba. MLCC ndi chipangizo chamagetsi cha ceramic chamagetsi chomwe chimapangidwa powonjezera zowonjezera zosinthidwabarium titanate ufa, yomwe ingagwiritsidwe ntchito mwachindunji ngati dielectric mu MLCC.
Ma oxides osowa padziko lapansindi zigawo zofunika za doping za MLCC dielectric powders. Ngakhale amawerengera zosakwana 1% ya MLCC zopangira, amatha kutenga gawo lofunikira pakukonza zida za ceramic ndikuwongolera kudalirika kwa MLCC. Ndi imodzi mwazinthu zofunika kwambiri pakupangira mapangidwe apamwamba a ufa wa ceramic wa MLCC.
[Mafunso] 1. Kodi ndi zinthu ziti zomwe sizipezeka padziko lapansi? Zinthu zosawerengeka zapadziko lapansi, zomwe zimadziwikanso kuti zitsulo zapadziko lapansi, ndi mawu omwe amatanthauza zinthu za lanthanide ndi magulu osowa padziko lapansi. Amakhala ndi zida zapadera zamagetsi komanso zakuthupi ndi zamankhwala, ndipo mawonekedwe awo apadera amagetsi, owoneka bwino, maginito, ndi matenthedwe amadziwika kuti nkhokwe yazinthu zatsopano.

Zinthu zapadziko lapansi zosawerengeka zimagawidwa kukhala: zinthu zopepuka zapadziko lapansi (zokhala ndi manambala ang'onoang'ono a atomiki):scandium(Sc),yttrium(Y),lanthanum(La),cerium(Ndi),praseodymium(Pr),neodymium(Nd), promethium (Pm),samarium(Sm) ndieuropium(EU); zinthu zolemera zapadziko lapansi (zokhala ndi manambala okulirapo a atomiki):gadolinium(Mulungu),terbium(Tb),dysprosium(Dy),holmium(Iwo),erbium(Er),thulium(Tm),ytterbium(Yb),lutetium(Lu).

Ma oxides osowa padziko lapansi amagwiritsidwa ntchito kwambiri muzoumba, makamakacerium oxide, lanthanum oxide, neodymium oxide, dysprosium oxide, samarium oxide, holmium oxide, erbium okusayidi, etc. Kuwonjezera pang'ono kapena kufufuza kuchuluka kwa osowa nthaka ku ziwiya zadothi zingasinthe kwambiri microstructure, gawo zikuchokera, kachulukidwe, makina katundu, thupi ndi mankhwala katundu ndi sintering katundu wa ceramic zipangizo.

2. Kugwiritsa ntchito dziko losowa mu MLCCBarium titanatendi imodzi mwazinthu zazikulu zopangira MLCC. Barium titanate ili ndi zida zabwino kwambiri za piezoelectric, ferroelectric ndi dielectric. Koyera barium titanate ali lalikulu mphamvu kutentha koyenera, mkulu sintering kutentha ndi lalikulu dielectric imfa, ndipo si oyenera ntchito mwachindunji kupanga capacitors ceramic.

Kafukufuku wasonyeza kuti ma dielectric a barium titanate amagwirizana kwambiri ndi mawonekedwe ake a kristalo. Kupyolera mu doping, mawonekedwe a kristalo a barium titanate amatha kuwongolera, potero kuwongolera ma dielectric ake. Izi makamaka chifukwa chabwino-grained barium titanate adzapanga chipolopolo-pachimake dongosolo pambuyo doping, amene amathandiza kwambiri kusintha kutentha makhalidwe capacitance.

Doping zosowa zapadziko lapansi mu kapangidwe ka barium titanate ndi njira imodzi yopititsira patsogolo khalidwe la sintering ndi kudalirika kwa MLCC. Kafukufuku wokhudzana ndi ion doped barium titanate yosowa padziko lapansi angayambike koyambirira kwa zaka za m'ma 1960. Kuphatikizika kwa ma oxides osowa padziko lapansi kumachepetsa kuyenda kwa okosijeni, komwe kumatha kupititsa patsogolo kutentha kwa dielectric ndi kukana kwamagetsi a ceramic ceramics, ndikuwongolera magwiridwe antchito ndi kudalirika kwa zinthu. Ma oxides osowa padziko lapansi omwe amawonjezeredwa nthawi zambiri ndi awa:yttrium oxide(Y2O3), Dysprosium oxide (Dy2O3), holmium oxide (Ho2O3), etc.

Kukula kokulirapo kwa ma ion padziko lapansi osowa kumakhudza kwambiri malo a Curie peak of barium titanate based ceramics. Doping wa zinthu zosowa zapadziko lapansi zokhala ndi ma radii osiyanasiyana zimatha kusintha magawo a kristalo okhala ndi zipolopolo zapakati, potero kusintha kupsinjika kwamkati kwa makristasi. Doping ya ayoni osowa padziko lapansi okhala ndi ma radii akulu amatsogolera kupanga magawo a pseudocubic mu makhiristo ndi kupsinjika kotsalira mkati mwa kristalo; Kuyambitsidwa kwa ma ion padziko lapansi osowa okhala ndi ma radii ang'onoang'ono kumapangitsanso kupsinjika kochepa mkati ndikupondereza kusintha kwa gawo lachipolopolo chapakati. Ngakhale ndi zowonjezera pang'ono, mawonekedwe a ma oxides osowa padziko lapansi, monga kukula kwa tinthu kapena mawonekedwe, amatha kukhudza kwambiri magwiridwe antchito kapena mtundu wa chinthucho. High performance MLCC ikukula mosalekeza kupita ku miniaturization, kutukuka kwakukulu, kuchuluka kwakukulu, kudalirika kwakukulu, komanso mtengo wotsika. Zogulitsa zapadziko lonse lapansi za MLCC zalowa mu nanoscale, ndipo ma oxides osowa padziko lapansi, monga zinthu zofunika kwambiri za doping, ayenera kukhala ndi kukula kwa tinthu tating'onoting'ono komanso kufalikira kwa ufa wabwino.