Ntshiab Titanium Crucibles: "Tag nrho-Round Containers" rau siab-Tsuas Kub thiab Corrosive Ib puag ncig
Nyob rau hauv qhov tseeb -tsav lub cheeb tsam ntawm cov ntaub ntawv science thiab siab -kub sim, lub crucible ua hauj lwm raws li lub hauv paus ntsiab lus rau muaj cov tshuaj tiv thaiv; yog li ntawd, kev xaiv cov khoom siv ncaj qha txiav txim siab qhov kev sim ua tiav thiab kev ntseeg tau ntawm cov ntaub ntawv. Ntshiab titanium crucibles sawv tawm ntawm ntau lub thawv hlau vim lawv qhov zoo sib xws ntawm qhov siab melting point, tsawg ntom, thiab tshwj xeeb corrosion kuj, ua rau lawv yog ib qho kev xaiv zoo tshaj plaws rau kev tuav cov tshuaj xav tau thiab siab - kub melts. Tsab ntawv xov xwm no muab ib qho kev soj ntsuam hauv - qhov tob ntawm qhov ntsuas qhov ntsuas kub, tus cwj pwm corrosion, thiab kev txwv kev ua haujlwm ntawm cov ntshiab titanium crucibles, muab cov ntaub ntawv tseem ceeb rau kev tshawb fawb thiab kev siv engineering.
I. Thermal Properties: Los ntawm Melting Point mus rau Kev Ua Haujlwm Zoo
Ntshiab titanium (Ti) yog cov hlau refractory nrog tshwj xeeb thermal thresholds; nkag siab txog cov kev txwv no yog thawj kauj ruam mus rau kev ua haujlwm nyab xeeb.
Theoretical Melting Point: Thermodynamic melting point ntawm ntshiab titanium yog 1668℃± 2 degree. Qhov no yog qhov ntsuas kub tseem ceeb uas nws hloov ntawm ib qho khoom mus rau lub xeev ua kua.
Qhov Kev Pab Cuam Siab Tshaj: Hauv lub tshuab nqus tsev lossis qhov siab -purity inert gas cua (xws li argon), ntshiab titanium crucibles tuaj yeem tiv taus qhov kub ntawm 1600℃-1660℃rau lub sijhawm luv. Nyob rau hauv no ntau yam, lub crucible ua hauj lwm nyob ze ntawm qhov txwv ntawm nws cov qauv kev ncaj ncees thiab tsuas yog haum rau static cua sov txheej txheem uas tsis muaj mechanical vibration los yog siab sib txawv.
Ntev-Lub Sijhawm Ua Haujlwm Kub: Txhawm rau kom muaj qhov ruaj khov thiab lub zog siv tshuab, lub sijhawm ua haujlwm ntev -Lub sijhawm ua haujlwm kub yuav tsum tau khaws cia ntawm 600℃thiab 800℃. Tshaj qhov ntau yam no ua rau muaj qhov nce ntxiv hauv tus nqi nkag, ua rau cov khoom muaj kev cuam tshuam rau cov yas deformation tsis tuaj yeem nyob rau hauv nws tus kheej qhov hnyav lossis cov khoom ntim khoom.
Qhov tseem ceeb Theem Kev Hloov Pauv: Ntawm kwv yees li 882℃, ntshiab titanium tau txais kev hloov pauv ntawm allotropic los ntawm hexagonal ze -packed (HCP) qauv ( -theem) rau lub cev -centered cubic (BCC) qauv ( -theem). Txawm hais tias qhov kev hloov pauv no tsis ua rau melting, qhov cuam tshuam ntim hloov pauv thiab qhov nce hauv qhov kev hloov pauv hauv lub cev ua rau txo qis cov khoom siv siab -kub creep resistance.
II. Chemical Stability: Tau los ntawm "Tus Kheej-Kho" Oxide Film
The reason pure titanium exhibits corrosion resistance superior to stainless steel-and even Hastelloy-lies in the dense, continuous, and highly chemically inert titanium dioxide (TiO₂) passivation film on its surface.
Cov oxide zaj duab xis no muaj ob yam tseem ceeb:
Kev tsim sai sai: Thaum sib cuag nrog huab cua lossis dej ntawm chav tsev kub, txheej txheej oxide kwv yees li ob peb nanometers tuab spontaneously tsim rau ntawm titanium nto.
Self-kev muaj peev xwm kho tau: Yog tias qhov chaw raug kev puas tsuaj los yog tshuaj lom neeg hauv cheeb tsam, cov titanium substrate raug tawm tshiab reacts nrog oxygen nyob rau hauv milliseconds kom rov tsim cov oxide zaj duab xis, yog li nres ntxiv corrosion.
Raws li cov khoom siv electrochemical no,ntshiab titanium cruciblesua kom pom kev sib raug zoo nrog cov xov xwm hauv qab no:
Muaj zog acid ib puag ncig: Nws tiv taus dilute sulfuric acid, hydrochloric acid, nitric acid (tshwj xeeb yog oxidizing acids tsis muaj fluoride ions), aqua regia, thiab feem ntau ntawm cov organic acids (xws li oxalic acid thiab formic acid). Nyob rau hauv oxidizing acids, oxide zaj duab xis thickens vim tshuaj oxidation, ua rau corrosion kuj uas yog superior rau qhov pom nyob rau hauv txo acids.
Kev daws alkaline thiab ntsev: Cov zaj duab xis passivation tseem nyob ruaj khov hauv cov tshuaj alkaline xws li sodium hydroxide thiab potassium hydroxide, nrog rau ntau yam nruab nrab lossis alkaline chloride ntsev tov (xws li NaCl, MgCl₂); Qhov kev nyiam rau pitting corrosion yog qis dua li ntawm stainless hlau.
Kev tshaj tawm tshwj xeeb: Ntshiab titanium yog ib qho ntawm ob peb cov khoom siv hlau tsim nyog siv rau hauv qhov chaw ntub dej chlorine. Txawm li cas los xij, cov ntsiab lus noo noo nyob rau hauv cov roj theem yuav tsum nruj me ntsis tswj nyob rau theem ntawm tsis pub tsawg tshaj li 0.01% -1.5%, raws li anhydrous chlorine gas tuaj yeem ua rau muaj kev kub ntxhov los yog hluav taws xob tshwm sim thaum sib cuag nrog titanium.
III. Kev txwv kev siv thiab hom tsis ua haujlwm
Txawm hais tias lawv cov kev ua tau zoo tshaj plaws, cov txheej txheej ntawm cov ntshiab titanium crucibles tuaj yeem raug puas irreversibly puas nyob rau hauv tej yam kev mob, ua rau "hydrogen embrittlement" los yog "ceev oxidation." Peb qhov xwm txheej hauv qab no yuav tsum zam nruj me ntsis:
Anhydrous muaj zog oxidizers: Tiv tauj nrog fuming nitric acid, qhuav chlorine (kua lossis roj), los yog peroxides ntawm qhov kub thiab txias yog nruj me ntsis txwv. Cov tshuaj no tuaj yeem ua rau muaj kev kub ntxhov, exothermic oxidation cov tshuaj tiv thaiv lossis txawm tias combustion.
Txo cov huab cua thiab cov ntsev molten: Nyob rau hauv siab -kub hydrogen atmospheres los yog carburizing ib puag ncig (xws li kev sib cuag ncaj qha nrog graphite), titanium absorbs hydrogen los ua brittle titanium hydride los yog reacts nrog carbon los tsim titanium carbide, heev cuam tshuam nws ductility. Tsis tas li ntawd, fluoride ions (F⁻) ua rau muaj kev puas tsuaj rau titanium; Txawm tias cov nyiaj feeb tuaj yeem yaj cov oxide txheej sai sai, ua rau "pitting" lossis perforation - hom corrosion.
Siab -Kev txwv kub ntawm melting: Txij li thaum lub melting point ntawm ntshiab titanium (1668 degree) yog qis dua li ntawm feem ntau refractory hlau (xws li tungsten, molybdenum, tantalum, thiab niobium), siv titanium crucibles los yaj cov hlau los yog lawv cov alloys yog nruj me ntsis txwv tsis pub; txwv tsis pub, lub crucible nws tus kheej yuav yaj los ntawm thawj.
IV. Cov ntsiab lus xaus thiab xaiv cov lus pom zoo
Cov khoom lag luam ntshiab (CP) titanium crucible sawv cev rau qhov kev sib tshuam tseem ceeb ntawm ob qhov kev ua tau zoo ntawm cov khoom siv: siab - kub tsis kam thiab tiv taus corrosion hnyav.
Kev Xaiv Logic: Thaum koj cov txheej txheem nruab nrab yog corrosive heev (tshwj xeeb yog tias nws muaj cov chloride ions) thiab yuav tsum tau ua haujlwm kub ntawm 300℃thiab 800 degree, CP titanium crucible muab tus nqi zoo tshaj -kev ua tau zoo piv rau quartz, alumina ceramics, lossis npib tsib xee{3}
Operational Recommendations: In practice, it is advisable to operate in a vacuum or under an argon protective atmosphere and to avoid the presence of fluorides or strong oxidizers with very low moisture content in the material. If short-term experiments must be conducted in the extreme temperature range (>1000 degree), xyuas kom cov phab ntsa tuab txaus thiab muab kev txhawb nqa sab nraud los tiv thaiv kev ua tsis tiav vim nkag.
Lub npe: Tina
Txoj hauj lwm: Manager
Email:W-Mo@titanmsgp.com
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