Cov xov hlau raw uas ua los ntawm PAN yuav tsum tau ua ntej-oxidized, carbonized kub tsawg, thiab carbonized kub siab los tsimcov fiber carbon, thiab tom qab ntawd graphitized los ua graphite fibers. Qhov kub ncav cuag ntawm 200 ℃ txog 2000-3000 ℃, uas ua cov tshuaj tiv thaiv sib txawv thiab tsim cov qauv sib txawv, uas ua rau muaj cov yam ntxwv sib txawv.
1. Theem Pyrolysis:Pre-oxidation nyob rau hauv qhov kub qis, qis-kub carbonization nyob rau hauv qhov kub siab
Ua ntej oxidation arylation tshwm sim, qhov ntev ntawm ze li ntawm 100 feeb, qhov kub ntawm 200-300 ℃, lub hom phiaj yog thermoplastic PAN linear macromolecular saw hlau mus rau hauv cov qauv trapezoidal uas tsis yog yas kub-resistant, qhov tshuaj tiv thaiv tseem ceeb rau cov saw hlau macromolecular ntawm cyclization thiab intermolecular crosslinking, nrog los ntawm pyrolysis tshuaj tiv thaiv thiab tso tawm ntau cov molecules me me. Lub arylation index feem ntau yog 40-60%.
Kub qis carbonization kubfeem ntau yog 300-800 ℃, feem ntau yog thermal cracking reaction, feem ntau siv high-kub hluav taws xob cua sov hlau, theem tsim tawm ntau cov pa roj thiab tar.
Cov yam ntxwv: Cov xim ntawm cov fiber ua ntej oxidized yuav tsaus dua, feem ntau yog dub, tab sis tseem khaws cov morphology ntawm cov fiber, cov qauv sab hauv tau dhau los ntawm qee qib ntawm kev hloov pauv tshuaj lom neeg, kev tsim ntawm ntau pawg neeg ua haujlwm uas muaj oxygen thiab cov qauv sib txuas, tso lub hauv paus rau kev ua kom carbonization tom qab.
2. (Kub heev) theem carbonization, yog qhov ua ntej-oxidation ntawm cov precursor hauv ib qho chaw inert ntawm qhov kub siab decomposition, tshem tawm ntawm uas ntxiv rau cov pa roj carbon heteroatoms (xws li oxygen, hydrogen, nitrogen, thiab lwm yam), yog li ntawd qhov maj mam carbonization, kev tsim cov amorphous carbon lossis microcrystalline carbon qauv. Cov txheej txheem no yog ib kauj ruam tseem ceeb hauv kev tsim cov pob txha carbon. Qhov kub feem ntau yog ntawm 1000-1800 ℃, feem ntau yog thermal condensation reaction, feem ntau ntawm cov graphite cua sov siv rau cua sov.
Cov yam ntxwv: Lub ntsiab lus tseem ceeb ntawm cov khoom siv carbonized yog carbon, cov qauv feem ntau yog amorphous carbon lossis chaotic graphite qauv, nws cov hluav taws xob conductivity, cov khoom siv kho tshuab piv rau cov khoom ua ntej-oxidation muaj qhov nce ntxiv.
3. Kev tsim cov duab kosyog kev kho cua sov ntxiv ntawm cov khoom carbonization ntawm qhov kub siab dua los txhawb cov qauv ntawm amorphous carbon lossis microcrystalline carbon mus rau cov qauv siv lead ua graphite zoo dua. Los ntawm kev ua haujlwm ntawm qhov kub siab, cov pa roj carbon atoms raug rov tsim dua los ua cov qauv txheej hexagonal lattice nrog qib siab ntawm kev taw qhia, yog li txhim kho qhov hluav taws xob thiab thermal conductivity thiab lub zog kho tshuab ntawm cov khoom.
Cov yam ntxwv: Cov khoom graphitized muaj cov qauv graphite crystalline heev, uas muab cov hluav taws xob zoo heev thiab thermal conductivity, nrog rau lub zog tshwj xeeb thiab modulus tshwj xeeb. Piv txwv li, high-moduluscov fiber carbontau txais los ntawm qib siab ntawm graphitization.
Cov kauj ruam tshwj xeeb thiab cov khoom siv uas yuav tsum tau ua rau pre-oxidation, carbonization thiab graphitization:
Ua ntej-oxidation: nqa tawm hauv huab cua ntawm qhov kub tswj tau ntawm 200-300 ° C. Kev nruj yuav tsum tau siv los txo cov fiber shrinkage.
Carbonization: nqa tawm hauv ib qho chaw inert nrog qhov kub nce maj mam mus rau 1000-2000 ° C.
Graphitization: ua tiav ntawm qhov kub siab dua (2000-3000 ° C), feem ntau nyob rau hauv lub tshuab nqus tsev lossis hauv huab cua inert.
Lub sijhawm tshaj tawm: Tsib Hlis-22-2025
