Tantalum, niobium, thiab tungsten yog txhua yam khoom siv uas feem ntau siv rau hauv cov ntawv thov kub. Txhua yam ntawm cov ntaub ntawv no muaj nws tus kheej cov yam ntxwv uas ua rau nws haum rau qee hom kev siv.
Tantalum yog ib qho tsis tshua muaj, tawv, thiab corrosion-resistant hlau uas feem ntau siv los tsim cov khoom siv hluav taws xob, xws li cov khoom siv hluav taws xob. Tantalum crucibles yog zoo tagnrho rau siv nyob rau hauv zus tau tej cov high-temperature alloys thiab hluavtaws gemstones, raws li zoo raws li rau kev loj hlob ntawm ib leeg muaju. Tantalum crucibles paub txog lawv qhov siab melting point thiab tsis kam mus rau tshuaj tua kab mob.
Niobium yog ib qho khoom muag, muaj zog, thiab cov khoom siv hluav taws xob zoo heev uas feem ntau siv rau hauv kev tsim cov khoom siv hluav taws xob thiab cov hlau. Niobium crucibles feem ntau yog siv los tsim cov khoom tshwj xeeb, xws li npib tsib xee-titanium, uas yog siv rau hauv cov khoom siv kho mob thiab kev siv aerospace. Niobium crucibles kuj tseem siv los tsim cov khoom siv hluav taws xob kub kub.
Tungsten yog ib qho nyuaj, ntom hlau uas muaj qhov siab tshaj plaws melting point ntawm txhua lub caij. Tungsten crucibles yog siv nyob rau hauv zus tau tej cov high-temperature alloys thiab hluavtaws pob zeb diamond. Tungsten crucibles paub txog lawv cov kav ntev thiab ua haujlwm rau thermal shock.
Hauv cov ntsiab lus, txhua yam ntawm cov ntaub ntawv no muaj nws cov khoom tshwj xeeb uas ua rau nws tsim nyog rau cov ntawv thov kub kub. Tantalum, niobium, thiab tungsten crucibles yog tag nrho cov kev xaiv txhim khu kev qha thaum nws los txog rau kev ua haujlwm kub thiab yuav tsum tau xaiv raws li cov kev xav tau tshwj xeeb ntawm txhua daim ntawv thov.
