Txij li thaumcrucibleyog siv los ua lub thawv thiab muaj convection sab hauv, raws li qhov loj ntawm generated ib leeg siv lead ua nce, kub convection thiab kub gradient uniformity yuav nyuaj rau tswj. Los ntawm kev ntxiv magnetic teb los ua cov conductive yaj ua rau Lorentz quab yuam, convection yuav qeeb los yog txawm tshem tawm los tsim ib tug zoo siv lead ua silicon.
Raws li hom magnetic teb, nws yuav muab faib ua kab rov tav magnetic teb, ntsug magnetic teb thiab CUSP magnetic teb:
Vertical magnetic teb tsis tuaj yeem tshem tawm lub ntsiab convection vim yog vim li cas thiab tsis tshua siv.
Cov kev taw qhia ntawm cov hlau nplaum sib nqus ntawm cov kab rov tav magnetic teb yog perpendicular mus rau lub ntsiab cua sov convection thiab ib feem yuam kev convection ntawm lub crucible phab ntsa, uas muaj peev xwm zoo inhibit zog, tswj lub flatness ntawm kev loj hlob interface, thiab txo txoj kev loj hlob kab txaij.
CUSP magnetic teb muaj ntau yam txaus txaus thiab kub hloov ntawm yaj vim nws symmetry, yog li kev tshawb fawb ntawm ntsug thiab CUSP magnetic teb tau mus tes ntawm tes.
Hauv Suav teb, Xi'an University of Technology tau paub txog kev tsim khoom thiab siv lead ua rub kev sim ntawm silicon ib leeg siv lead ua siv cov hlau nplaum ua ntej. Nws cov khoom tseem ceeb yog 6-8in nrov hom, uas yog tsom rau ntawm silicon wafer ua lag luam rau hnub ci photovoltaic hlwb. Nyob rau hauv txawv teb chaws, xws li KAYEX nyob rau hauv lub tebchaws United States thiab CGS nyob rau hauv lub teb chaws Yelemees, lawv cov khoom tseem ceeb yog 8-16in, uas yog haum rau ib leeg siv lead ua silicon rods nyob rau theem ntawm ultra-loj-scale integrated circuits thiab semiconductors. Lawv muaj ib tug monopoly nyob rau hauv lub teb ntawm magnetic teb rau kev loj hlob ntawm loj-inch high-zoo ib leeg muaju thiab yog cov neeg sawv cev tshaj plaws.
Kev faib tawm ntawm cov hlau nplaum nyob rau hauv thaj chaw crucible ntawm ib qho kev loj hlob siv lead ua yog qhov tseem ceeb tshaj plaws ntawm cov hlau nplaum, nrog rau lub zog thiab kev sib txuam ntawm cov hlau nplaum ntawm ntug ntawm lub crucible, qhov nruab nrab ntawm lub crucible, thiab qhov tsim nyog. nrug deb ntawm cov kua nto. Lub zuag qhia tag nrho kab rov tav thiab niaj hnub transverse magnetic teb, cov kab sib nqus ntawm lub zog yog perpendicular rau cov siv lead ua loj hlob axis. Raws li cov nyhuv sib nqus thiab Ampere txoj cai, lub kauj yog ze tshaj plaws rau ntawm ntug ntawm lub crucible thiab lub zog teb yog qhov loj tshaj plaws. Raws li qhov kev ncua deb nce, huab cua sib nqus kuj nce, lub zog teb maj mam txo, thiab nws yog qhov tsawg tshaj plaws ntawm qhov chaw.
Lub luag haujlwm ntawm superconducting magnetic teb
Inhibiting thermal convection: Nyob rau hauv qhov tsis muaj ib qho kev sib nqus sab nraud, molten silicon yuav tsim cov convection ntuj thaum cua sov, uas yuav ua rau tsis sib xws ntawm impurities thiab tsim ntawm crystal defects. Sab nraud magnetic teb tuaj yeem cuam tshuam qhov convection no, ua rau qhov kub thiab txias hauv cov yaj hauv cov yaj zoo ib yam thiab txo qhov tsis sib xws ntawm impurities.
Kev tswj tus nqi siv lead ua kev loj hlob: Cov hlau nplaum tuaj yeem cuam tshuam tus nqi thiab kev coj ntawm kev loj hlob siv lead ua. Los ntawm kev tswj hwm lub zog thiab kev faib tawm ntawm cov hlau nplaum, cov txheej txheem siv lead ua tuaj yeem ua kom zoo dua qub thiab kev ncaj ncees thiab kev sib luag ntawm cov siv lead ua tuaj yeem txhim kho. Thaum lub sij hawm kev loj hlob ntawm ib leeg siv lead ua silicon, oxygen nkag mus rau silicon yaj tsuas yog los ntawm cov txheeb ze txav ntawm cov yaj thiab cov crucible. Cov hlau nplaum yuav txo tau lub caij nyoog ntawm oxygen hu rau silicon yaj los ntawm kev txo cov convection ntawm cov yaj, yog li txo qhov kev tawg ntawm oxygen. Qee qhov xwm txheej, sab nraud magnetic teb tuaj yeem hloov pauv cov txheej txheem thermodynamic ntawm cov yaj, xws li los ntawm kev hloov qhov nro ntawm cov yaj, uas tuaj yeem pab cov volatilization ntawm oxygen, yog li txo cov ntsiab lus oxygen hauv cov yaj.
Txo cov kev sib cais ntawm cov pa oxygen thiab lwm yam impurities: Oxygen yog ib qho ntawm cov impurities hauv kev loj hlob ntawm silicon crystals, uas yuav ua rau cov khoom siv lead ua tsis zoo. Cov hlau nplaum tuaj yeem txo cov ntsiab lus ntawm cov pa oxygen hauv cov yaj, yog li txo qhov kev tawg ntawm cov pa oxygen hauv cov khoom siv lead ua thiab txhim kho cov purity ntawm cov siv lead ua.
Txhim kho cov qauv sab hauv ntawm cov siv lead ua: Cov hlau nplaum tuaj yeem cuam tshuam rau cov qauv tsis xws luag hauv cov siv lead ua, xws li dislocations thiab grain ciam teb. Los ntawm kev txo tus naj npawb ntawm cov teeb meem no thiab cuam tshuam rau lawv cov kev faib tawm, tag nrho cov khoom siv lead ua zoo tuaj yeem txhim kho.
Txhim kho cov khoom siv hluav taws xob ntawm cov khoom siv lead ua: Txij li cov hlau nplaum muaj qhov cuam tshuam rau microstructure thaum lub sij hawm siv lead ua loj hlob, lawv tuaj yeem txhim kho cov khoom siv hluav taws xob ntawm cov khoom siv lead ua, xws li cov khoom siv hluav taws xob thiab cov khoom siv lub neej, uas yog qhov tseem ceeb rau kev tsim cov khoom siv semiconductor.
Txais tos txhua tus neeg muas zaub los ntawm thoob plaws lub ntiaj teb tuaj xyuas peb rau kev sib tham ntxiv!
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Post lub sij hawm: Lub Xya hli ntuj-24-2024