Nrog rau txoj kev loj hlob ntawm kev lag luam, lub crucible tau dhau los ua cov khoom siv tseem ceeb heev. Lub crucible yog ib lub thawv uas siv rau cua sov tsis tshua muaj hlau los yog ua alloys. Nws tuaj yeem tiv taus kub thiab corrosion kuj, thiab yog ib qho tseem ceeb ntawm kev lag luam teb. Yog li, dab tsi yog lub crucible? Vim li cas nws tuaj yeem tiv taus ntau dua ib txhiab degrees ntawm cov hlau molten? Cov khoom siv yog dab tsi? Daim ntawv no yuav tshawb txog cov teeb meem no kom tob.
Lub crucible yog dab tsi?
Lub crucible tuaj yeem piav qhia tau tias yog lub khob zoo li lub khob lossis funnel-shaped ntim, feem ntau yog ua los ntawm cov khoom siv xws li ceramic, hlau, lossis graphite. Lawv feem ntau yog siv los ua cua sov lossis melting ntawm cov khoom siv hauv kev sim lossis kev tsim khoom, xws li hlau, iav, ceramics, thiab lwm yam. Ntau cov ntaub ntawv tsis tuaj yeem tiv taus qhov kub siab thaum cua sov, yog li lub crucible pom qhov sib npaug ntawm hardening thiab softening, cia lawv. kom ruaj khov thiab ruaj khov ntawm qhov kub thiab txias, muab qhov tsim nyog rau kev sim lossis kev tsim khoom.
Lub crucible tuaj yeem dais ntau tshaj ib txhiab degrees ntawm cov hlau molten, feem ntau yog vim li cas?
Lub hauv paus ntsiab lus ntawm crucible los tiv thaiv kub kub yog: xaiv qhov siab melting point, kub tsis kam, corrosion kuj thiab zoo thermal conductivity ntawm cov ntaub ntawv. Ordinary crucibles feem ntau yog ua los ntawm ceramics, thaum graphite crucibles yog siv nyob rau hauv kub. Qhov no yog vim tias graphite muaj cov thermal conductivity siab heev thiab tsis yooj yim hloov lossis puas thaum nws raug kub. Piv txwv li, hauv steel smelting, graphite crucible feem ntau yog siv los nqa cov hlau yaj. Graphite nws tus kheej yog ib qho ntawm cov qauv ntawm cov pa roj carbon monoxide. Vim nws cov khoom tshwj xeeb ntawm nws cov qauv molecular, nws muaj qhov kub thiab txias tsis kam thiab ruaj khov corrosion tsis kam rau ntau cov kua qaub, hauv paus thiab cov kuab tshuaj.
Ntxiv nrog rau graphite, muaj lwm cov ntaub ntawv uas tuaj yeem tiv taus qhov kub thiab txias los yog corrosion kuj tseem siv los ua crucibles. Piv txwv li, cov hlau xws li txhuas oxides, tungsten, molybdenum, thiab platinum tuaj yeem ua rau cov crucibles uas tuaj yeem tiv taus qhov kub thiab txias.
Cov khoom siv dab tsi yog qhov crucible feem ntau ua los ntawm?
Crucibles yog siv nyob rau hauv txawv industrial teb, yog li ntawd lawv siv ntau yam ntaub ntawv. Ntawm no yog cov yam ntxwv ntawm ntau yam ntaub ntawv uas feem ntau yog siv los ua crucibles:
ceramic crucible
Ceramic crucible yog tsis yooj yim piv nrog rau lwm cov ntaub ntawv nyob rau hauv ib puag ncig kub, tab sis tseem muaj ntau yam zoo. Piv txwv li, lawv yooj yim rau txheej txheem thiab tus nqi qis dua. Tsis tas li ntawd, ceramic crucible yog qhov tsim nyog rau kev sim thiab kev tsim khoom ntawm qee cov nonmetals thiab semiconductors.
Hlau crucible
Cov hlau crucibles muaj lub peev xwm ua kom muaj cua sov siab, tab sis lawv feem ntau kim dua lwm hom crucibles thiab muaj teeb meem nrog oxidation, corrosion thiab cov tshuaj tiv thaiv. Yog li ntawd, lawv tsuas yog siv rau hauv kev tsim thiab ua cov hlau lossis cov khoom hnyav.
black-lead crucible
Graphite crucibles tuaj yeem tiv taus qhov kub thiab txias thiab muaj kev tiv thaiv corrosion zoo, yog li lawv feem ntau siv hauv steel smelting, alloy manufacturing thiab lwm yam kub kub.
alumina crucible
Alumina crucible yog cov khoom siv ceramic nrog kev ua haujlwm kub zoo heev. Nws tuaj yeem ua haujlwm tsis tu ncua thiab ruaj khov nyob rau hauv huab cua txias thiab muaj zog corrosion kuj. Tsis tas li ntawd, lawv kuj tau siv dav hauv kev lag luam semiconductor.
ua sum
Crucible yog ib qho khoom siv tseem ceeb hauv kev lag luam, muaj ntau yam thiab siv ntau yam. Qhov laj thawj yog vim li cas lub crucible tuaj yeem tiv taus ntau tshaj ib txhiab degrees ntawm cov hlau molten feem ntau yog vim qhov kev xaiv ntawm kub resistant, corrosion resistant cov ntaub ntawv thiab manufacturing.
