Catalytic graphitization yog ib txoj kev siv tshuab uas, thaum lub sijhawm npaj cov ntaub ntawv carbon, siv cov catalysts tshwj xeeb (xws li hlau, ferrosilicon, boron, thiab lwm yam) los pab txhawb kev hloov pauv ntawm amorphous carbon mus rau hauv cov qauv graphite ntawm qhov kub qis dua.
Txoj Cai Txuj Ci
Lub hauv paus ntawm catalytic graphitization yog siv cov catalysts los txo qhov zog ua haujlwm ntawm cov tshuaj graphitization, yog li ua kom cov pa roj carbon hloov pauv sai dua los ntawm kev teeb tsa tsis sib xws mus rau cov qauv graphite. Cov txheej txheem feem ntau suav nrog ob lub tswv yim:
Lub Tswv Yim Yaj-Nag:
Cov pa roj carbon amorphous yaj rau hauv cov khoom sib xyaw uas tsim los ntawm cov catalyst. Thaum cov yaj mus txog qhov xwm txheej supersaturated, cov pa roj carbon atoms precipitate tawm hauv daim ntawv ntawm graphite crystals.
Piv txwv li, ib qho catalyst ferrosilicon tuaj yeem yaj txog li 2% carbon ntawm 1600 ° C, ua rau cov pa roj carbon los ua graphite. Tib lub sijhawm, kev tsim cov qauv silicon carbide hexagonal pab txhawb rau kev tsim graphite.
Cov txheej txheem tsim-kev rhuav tshem ntawm carbide:
Cov catalyst reacts nrog carbon los tsim cov carbides, uas decompose rau hauv graphite thiab hlau pa ntawm qhov kub siab.
Piv txwv li, hlau oxide ua rau cov pa roj carbon ua rau hlau thiab carbon monoxide. Cov hlau ces sib xyaw nrog carbon los ua hlau carbide, uas thaum kawg lwj mus ua cov pa roj carbon thiab hlau uas yooj yim graphitizable.
Cov Hom Tshuaj Catalyst thiab Cov Teebmeem
Catalyst Ferrosilicon:
- Cov ntsiab lus silicon zoo tshaj plaws yog 25%, uas tuaj yeem txo qhov kub ntawm graphitization ntawm 2500-3000 ° C txog 1500 ° C.
- Qhov loj ntawm cov khoom me me ntawm ferrosilicon cuam tshuam rau qhov cuam tshuam catalytic: thaum qhov loj ntawm cov khoom me me txo qis los ntawm 75 μm mus rau 50 μm, qhov hluav taws xob resistivity txo qis. Txawm li cas los xij, cov khoom me me dhau (<50 μm) tuaj yeem ua rau muaj kev nce ntxiv hauv resistivity.
Boron Catalyst:
- Nws tuaj yeem txo qhov kub ntawm graphitization kom qis dua 2200 ° C thiab txhim kho qib kev taw qhia ntawm cov carbon fibers.
- Piv txwv li, ntxiv 0.25% boric acid rau hauv zaj duab xis graphene oxidized thiab kho nws ntawm 2000 ° C ua rau muaj hluav taws xob conductivity ntau dua 47% thiab qib graphitization ntau dua 80%.
Cov Khoom Siv Hlau:
- Hlau muaj qhov kub yaj ntawm 1535 ° C. Thaum ntxiv silicon, qhov kub yaj poob rau ib puag ncig 1250 ° C, thiab kev ua catalytic pib ntawm qhov kub no.
- Hlau tawm hauv daim ntawv gaseous ntawm 2000 ° C, thaum silicon tawm ua pa saum toj no 2240 ° C, tsis muaj cov khoom seem hauv cov khoom kawg.
Cov Kev Zoo ntawm Kev Siv Tshuab
Kev Txuag Hluav Taws Xob:
Kev siv graphitization ib txwm xav tau qhov kub siab ntawm 2000-3000 ° C, thaum catalytic graphitization tuaj yeem txo qhov kub kom txog li 1500 ° C, uas txuag tau hluav taws xob ntau.
Lub voj voog tsim khoom luv dua:
Kev ua haujlwm catalytic ua rau qhov kev hloov pauv ntawm cov pa roj carbon atoms sai dua, ua rau lub sijhawm graphitization luv dua.
Kev Ua Tau Zoo Dua ntawm Cov Khoom Siv:
Catalytic graphitization tuaj yeem kho cov qauv tsis zoo thiab ua rau qib ntawm graphitization nce ntxiv, yog li txhim kho kev ua hluav taws xob, kev ua kom sov, thiab lub zog kho tshuab.
- Piv txwv li, boron-catalyzed graphitization tsim cov yeeb yaj kiab graphene nrog cov hluav taws xob conductivity ntawm 3400 S / cm, tsim nyog rau cov ntawv thov hauv cov khoom siv hluav taws xob yooj ywm thiab electromagnetic interference shielding.
Cov Cheeb Tsam Thov
Cov Khoom Siv Hluav Taws Xob:
Cov graphite electrodes uas tau npaj los ntawm catalytic graphitization qhia tau tias muaj kev ua hluav taws xob zoo thiab tiv taus cua sov, ua rau lawv haum rau kev lag luam xws li metallurgy thiab electrochemistry.
Cov Khoom Siv Khaws Cia Hluav Taws Xob:
Cov ntaub ntawv carbon graphitized yog siv ua anodes hauv lithium/sodium roj teeb, txhim kho lub peev xwm tshwj xeeb ntawm kev them-tso tawm thiab kev ruaj khov ntawm lub voj voog.
Cov Khoom Siv Sib Xyaws:
Cov thev naus laus zis catalytic graphitization tuaj yeem tsim cov khoom siv carbon / carbon composite ua tau zoo rau kev siv hauv aerospace, automotive manufacturing, thiab lwm yam.
Cov Kev Sib Tw Txuj Ci
Kev Xaiv thiab Kev Txhim Kho Catalyst:
Cov catalysts sib txawv muaj cov teebmeem catalytic sib txawv, uas yuav tsum tau xaiv cov catalysts tsim nyog raws li hom khoom siv thiab cov txheej txheem.
Cov Teeb Meem Catalyst Residue:
Qee cov catalysts (xws li vanadium) muaj cov ntsiab lus melting siab thiab nyuaj rau tshem tawm tag nrho tom qab graphitization, uas muaj peev xwm cuam tshuam rau cov khoom siv purity.
Kev Tswj Xyuas Txheej Txheem:
Kev ua kom cov graphitization catalytic muaj kev nkag siab rau cov yam ntxwv xws li qhov kub thiab txias, huab cua, thiab lub sijhawm, uas xav tau kev tswj hwm kom meej kom tsis txhob muaj kev ua kom cov graphitization ntau dhau lossis kev ua kom cov graphitization tsis txaus.
Lub sijhawm tshaj tawm: Lub Kaum Hli-09-2025