Tantalum cruciblesyog kub-resistant vim tantalum cov khoom raws li arefractory hlau:
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Tus nqi / Nqe lus piav qhia
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3017℃(5463℃F) - 5th siab tshaj ntawm tag nrho cov hlau
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Max siv qhov kub thiab txias (nqus / inert)
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Max siv sijhawm luv luv (nqus / inert)
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Txog li ~ 2500℃(nyob ntawm daim ntawv thov & cua)
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Oxidation cwj pwm hauv huab cua
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Daim ntawv Ta₂O₅; oxidation ceev tshaj li ~ 300-400℃txwv siv hauv huab cua
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~ 57 W / (m·K) - zoo hloov cua sov
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Khaws cov khoom siv dag zog zoo dua li cov hlau ntawm qhov kub siab
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Kev tiv thaiv zoo rau feem ntau cov kua qaub (tshwj tsis yog HF thiab kub concentrated tov kua qaub)
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Heat-resistance cov ntsiab lus:
Hauvvacuum los yog inert gas, tantalum crucibles tiv taus cua sov ntev ze li 2000℃nrog tsawg degradation.
Hauvhuab cua, siv tau kub yog qis dua (~ 300-400 degree) vim oxide scale tsim, uas tuaj yeem ua tuab thiab nkig.
Thermal shock resistance yog nruab nrab; Kev hloov pauv kub tam sim ntawd tuaj yeem tawg lub crucible.
Qhov txiaj ntsig tseem ceeb:Combines siab melting point nrog muaj zog corrosion kuj, ua rau nws zoo tagnrho rau tshwj xeeb high-temperature melts nyob rau hauv tswj tej huab cua.
(Ob nqe lus nug tib yam - teb ua ke.)
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Qhov kub siab tshaj plaws
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Hauv lub tshuab nqus tsev lossis inert gas (zoo tagnrho)
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~ 2000℃nruam, short-term mus txog~ 2500 degree
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~ 300-400 degree(oxidation txwv kev siv tswv yim)
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Molten hlau compatibility
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Yuav tsum siab tshaj qhov kub thiab txias tab sis qis dua 2000℃hauv inert / nqus; Piv txwv li, rau melting tej reactive hlau, tshwj xeeb alloys, los yog ua high-T thwmsim
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Atmosphere tseem ceeb heev: Tantalum's oxidation kuj tiv thaiv nws ib ntus, tab sis saum toj no ~ 400℃hauv huab cua, oxide txheej thickens, ua rau poob ntawm ductility thiab qhov kawg tsis ua hauj lwm.
Thermal cycling: Rov ua cua sov / txias hauv lub tshuab nqus tsev txuas lub neej; Nyob rau hauv huab cua, rov oxidation cycles ua rau spalling ntawm oxide nplai.
Tshuaj compatibility: Tsis txhob melts uas muaj fluorine, muaj zog alkalis ntawm siab T, los yog hom uas tua Ta₂O₅ txheej.
Sib piv nrog rau lwm yam refractory crucibles:
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Max Temp hauv Nqus Tsev / Inert
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Max Temp nyob rau hauv Cua
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~ 600℃(tso los ntawm oxidation)
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~ 500℃(kub hauv huab cua)
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Takeaway
Qhov kub siab tshaj plaws rau tantalum crucibleyogtxog 2000 degreerau kev siv tas mus li hauvvacuum los yog inert gas.
Hauvhuab cua, txwv tsuas yog300-400 degreevim oxidation ceev.
Tantalum crucibles raug xaiv rau lawvua ke ntawm ultra-high melting point, corrosion kuj, thiab stability nyob rau hauv cov huab cua tswj, txawm tias huab cua txwv.
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