Ntawm cov tsev neeg tsis tshua muaj hlau,niobiumtau dhau los ua cov khoom tseem ceeb hauv cov tshuaj, hluav taws xob, thiab kev kho mob vim nws cov ntsiab lus melting zoo, kev ua tau zoo, thiab cov khoom tshwj xeeb superconducting. Txawm li cas los xij, hauv kev siv tswv yim, tshwj xeeb tshaj yog nyob rau hauv siab - qhov kub thiab txias hauv huab cua, oxidation ntawm niobium ib txwm yog ib qho kev taw qhia uas cov engineers thiab cov neeg yuav khoom yuav tsum muab qhov tseem ceeb rau. Tsab ntawv xov xwm no yuav nthuav qhia koj txog kev paub txog kev lag luam thiab kev ua lag luam nyob ib ncig ntawm cov kab tseem ceeb ntawm "thaum ntshiab niobium pib oxidize hauv huab cua, yuav ua li cas cov txheej txheem oxidation hloov zuj zus, thiab yuav ua li cas tiv thaiv nws."
Ntshiab niobium (Nb) yog ib qho nyiaj - grey, mos refractory hlau nrog lub melting point txog 2477 degree, ntau dua li cov hlau xws li titanium thiab zirconium. Nws muaj corrosion kuj zoo heev nyob rau hauv chav tsev kub, ua tsaug rau ib tug ntom thiab ruaj khov oxide zaj duab xis (lub ntsiab tivthaiv yog niobium pentoxide) uas tsim instantly ntawm nws nto. Txawm li cas los xij, qhov no tus kheej - kho "cov khaub ncaws tiv thaiv" tsis yog panacea. Thaum qhov kub thiab txias nce, tus nqi tsim, qauv, thiab kev tiv thaiv muaj peev xwm ntawm oxide zaj duab xis yuav hloov. Thaum ib qho kub tseem ceeb dhau lawm, oxidation yuav hloov ntawm "surface passivation" mus rau "kev puas tsuaj loj heev".
Ib tug loj tus naj npawb ntawm kev sim cov ntaub ntawv thiab kev lag luam xyaum qhia tau hais tias thawj oxidation kub ntau yam ntawm ntshiab niobium nyob rau hauv cov huab cua yog hais txog 200℃~ 230 degree. Tshwj xeeb:
200 degree: Qhov saum npoo ntawm niobium pib hnov mob nrog oxygen nyob rau hauv cov huab cua, tsim ib tug heev nyias (nanoscale) oxide zaj duab xis. Lub sijhawm no, oxidation tus nqi qis heev, thiab cov yeeb yaj kiab tseem muaj qee qhov kev tiv thaiv.
230 degree: Feem ntau suav hais tias yog qhov ntsuas kub siab rau kev siv ruaj khov ntawm niobium hauv huab cua. Tom qab tshaj qhov ntsuas kub no, txawm tias lub sijhawm luv luv, kev tiv thaiv lossis lub tshuab nqus tsev raug pom zoo.
Cov tswv yim siv tswv yim: Yog tias koj cov txheej txheem xav tau luv luv - cua sov hauv huab cua qis dua 250℃(xws li ziab, qis- kub degassing), niobium ntshiab tuaj yeem tiv taus nws, tab sis nws tsis pom zoo kom suav lub xeev no yog "zoo li qub". Rau qhov chaw ua haujlwm tsis tu ncua lossis muaj qhov yuav tsum tau ua kom nruj, nco ntsoov tswj tsis pub dhau 200 degree.
Thaum qhov kub siab tshaj 230 degree, oxidation tus cwj pwm ntawm niobium yuav deteriorate ho nyob rau theem.
Txog 300 degree: Muaj zog oxidation pib
Thaum qhov kub los yog nce mus txog 300 degree, cov tshuaj tiv thaiv oxidation nrawm nrawm heev. Nyob rau lub sijhawm no, kev loj hlob kev ntxhov siab pib tsim nyob rau hauv keeb kwm txuas ntxiv thiab ntom oxide zaj duab xis, thiab microcracks tshwm. Oxygen ncaj qha hu rau cov hlau matrix tshiab los ntawm cov kab nrib pleb, ua rau hauv zos oxidation sai. Cov xim saum npoo ntawm niobium tuaj yeem pom ntawm qhov muag liab qab, hloov ntawm lub teeb grey mus rau daj daj lossis xiav -liab. Cov theem no yog twb irreversible oxidation, thiab cov hlau nplaum tsis tuaj yeem rov qab tau txawm tias qhov kub thiab txias.
Txog 400 degree: Cov oxide zaj duab xis puas tag thiab poob
Nyob ib ncig ntawm 400 degree, niobium nto yuav raug hloov pauv tseem ceeb: qis-valent oxides (xws li NbO, NbO₂) decompose los yog hloov mus rau Nb₂O₅, nrog rau qhov ntim nthuav dav li ntawm 10% mus rau 20%. Cov nyhuv loj loj ua rau cov oxide zaj duab xis tsim nyob rau hauv cov theem thaum ntxov kom tawg tag, nqa, thiab poob rau hauv tej daim. Tom qab poob cov txheej txheem tiv thaiv, cov hlau matrix ncaj qha raug, thiab oxidation tus nqi nce exponentially. Yog tias cov cua sov txuas ntxiv rau lub sijhawm no, niobium yuav dhau los ua "pulverization" tshwm sim - tus ntoo khaub lig hlau -section yog hloov sai sai los ntawm cov hmoov dub lossis dawb niobium pentoxide.
500℃thiab siab dua: ib txheej tuab thiab xoob Nb₂O₅ yog tsim
Thaum qhov kub siab tshaj 500 degree, cov tshuaj tiv thaiv oxidation yog tag nrho ntawm kev tswj. Cov khoom kawg yog yuav luag tag nrho Nb₂O₅-dawb lossis daj, ntxeem tau, tsis muaj kev tiv thaiv oxide. Cov txheej txheem oxide no tsis tuaj yeem thaiv cov pa tawm sab hauv sab hauv, yog li cov txheej txheem oxidation ua raws li kab lossis parabolic- txoj cai linear, thiab hlau poob sai heev. Piv txwv li, nyob rau hauv huab cua ntawm 600 degree, ntshiab niobium nplooj ntawv tej zaum yuav tag nrho tig mus rau hauv oxide hmoov nyob rau hauv ob peb teev.
4. Peb qhov kev pheej hmoo loj los ntawm oxidation rau kev siv
Kev ua haujlwm tsis ua haujlwm: Cov txheej oxide ua rau muaj kev poob qis hauv hluav taws xob thiab thermal conductivity; Rau cov khoom siv superconducting, nyias oxide nplai yuav cuam tshuam rau kev ua haujlwm ntawm kev sib tshuam.
Loj tawm - ntawm - kam rau ua: Vim yog kev hloov pauv ntawm cov hlau mus rau hauv oxides (ntim), cov khoom siv precision yuav tswj tsis tau, lossis txawm tias daig lossis tawg.
Kev pheej hmoo ntawm kev kis kab mob: Exfoliated oxidized hmoov tuaj yeem paug lub tshuab nqus tsev, reactors, lossis tshuaj lom neeg, thiab tshwj xeeb tshaj yog rau kev huv huv (xws li, semiconductors, kho mob cog).
5. Kev tiv thaiv ntawm qhov kub thiab txias: Yuav ua li cas siv niobium kom ruaj ntseg ntawm ntau dua lossis sib npaug li 300 degree?
Txij li thaum huab cua ib puag ncig tsis muaj, hauv kev tsim khoom tiag tiag, peb pom zoo rau peb hom kev paub daws teeb meem hauv qab no:
✅ Kev xaiv 1: Lub tshuab nqus tsev siab (pom zoo)
Qhov ntsuas kub: tag nrho qhov kub thiab txias (chav kub ~ melting point)
Qhov yuav tsum tau muaj: Lub tshuab nqus tsev kawm ntawv yuav tsum zoo dua 1 × 10⁻³ Pa (10⁻⁵ mbar) kom zoo inhibit oxidation; rau superconducting lossis electron beam melting nrog cov kev xav tau siab heev, nws yuav tsum zoo dua 10⁻⁵ Pa.
Nco tseg: Thaum niobium raug cua sov hauv lub tshuab nqus tsev, koj yuav tsum tau xyuam xim rau nws cov tshuaj tiv thaiv nrog cov pa oxygen seem thiab dej vapor - txheej oxide nyias nyias tseem yuav tsim nyob rau hauv ultra- lub tshuab nqus tsev siab, tab sis nws tuaj yeem tsis quav ntsej.
✅ Kev xaiv 2: Inert gas tiv thaiv
Cov pa siv tau: argon (Ar, purity Ntau dua lossis sib npaug rau 99.999%), helium (He)
Txoj kev: Nruam dhau siab - purity argon roj rau hauv qhov cub kho cua sov los yog vuam alarm kom txo cov pa oxygen rau<10 ppm.
Kev txwv: Thaum qhov kub siab tshaj 1000℃, thiab qhov kub thiab txias tau khaws cia rau lub sijhawm ntev, txawm tias siab -purity argon tsis tuaj yeem tshem tawm tag nrho cov kab oxidation. Nws raug nquahu kom ntim nws nrog tantalum ntawv ci lossis niobium ntawv ci.
✅ Kev xaiv 3: Hlau cladding lossis txheej
Txoj kev: Ua tiav qhwv lub niobium workpiece nrog tantalum (Ta) ntawv ci. Tantalum muaj peev xwm nqus tau huab cua zoo ntawm qhov kub thiab txias, thiab oxidation tus nqi qis dua li ntawm niobium; los yog npaj siab -kub resistant thiab anti- oxidation txheej (xws li silicide, chromide) ntawm niobium nto.
Muaj cov xwm txheej: kev kho cua sov ntawm cov khoom loj lossis lub thawv rauv uas tsis tuaj yeem khiav tawm.
6. Pom zoo tej yam kev mob rau cov ntawv thov
| Txheej Txheem / Daim Ntawv Thov | Pom zoo ib puag ncig | Qhov kub thiab txias |
|---|---|---|
| Tsawg-kub degassing, ziab | Cua (lub sij hawm luv luv) los yog lub tshuab nqus tsev | Tsawg dua los yog sib npaug li 200 degree |
| Cia lossis machining hauv huab cua (chav kub) | Huab cua (safe) | 20-25 ° C |
| Lub sij hawm luv luv thermal raug ntawm Nb reactors / electrodes | Nqus los yog argon tiv thaiv | 300-600 degree |
| Nqus annealing/stress relieving ntawm niobium | Nqus (tsawg dua lossis sib npaug li 10⁻³ Pa) lossis argon | 800-1200 degree |
| Vuam ntawm niobium (TIG, electron beam) | Inert gas shielding los yog lub tshuab nqus tsev chamber | Local melting zone >2000 degree |
| Kub-kub degassing ntawm niobium SRF kab noj hniav | Ultra-high nqus tsev vacuum (<10⁻⁵ Pa) | 1400-1800 degree |
7. Cov ntsiab lus thiab cov lus qhia xaiv cov khoom
Ntshiab niobium pib oxidize me ntsis hauv huab cua ntawm 200 degree, thiab 230℃yog qhov ntev -lub sij hawm siv kub txwv.
Muaj zog oxidation tshwm sim saum toj no 300 degree, thiab oxide zaj duab xis puas lawm thiab ntog tawm ntawm 400 degree.
Txhua txheej txheem saum 300℃yuav tsum tau tiv thaiv los ntawm lub tshuab nqus tsev lossis siab -purity inert gas.
Yog tias koj qhov kev lag luam muaj kev kub siab ua haujlwm ntawm cov khoom niobium (xws li sputtering lub hom phiaj, superconducting accelerators, siab -kub alloy ntxiv), nco ntsoov qhia meej txog kev tiv thaiv huab cua thaum lub sij hawm tsim txheej txheem.
lis
Tus Thawj Tswj Muag
Xov tooj / weChat / whatsApp
(82)-18291772322
E -mail
Ta-Nb@titanmsgp.com
