PAN-raws li raw hlau yuav tsum tau pre-oxidized, qis-kub carbonized, thiab high-temperature carbonized los tsimcarbon fibers, thiab ces graphitized los ua graphite fibers. Qhov kub nce mus txog 200 ℃ txog 2000-3000 ℃, uas ua rau muaj kev sib txawv thiab tsim cov qauv sib txawv, uas nyob rau hauv lem muaj cov khoom sib txawv.
1. Pyrolysis theem:Pre-oxidation nyob rau hauv qis-kub ib feem, low-temperature carbonization nyob rau hauv high-temperature part
Pre-oxidation arylation tshwm sim, qhov ntev ntawm ze li ntawm 100 feeb, qhov kub ntawm 200-300 ℃, lub hom phiaj yog kom thermoplastic PAN linear macromolecular saw rau hauv cov qauv uas tsis yog-yas tshav kub-resistant trapezoidal, lub ntsiab cov tshuaj tiv thaiv rau macromolecular saw ntawm cyclization thiab intermolecular crosslinking, nrog rau cov tshuaj tiv thaiv me me. Lub arylation index feem ntau yog 40-60%.
Tsawg-kub carbonization kubfeem ntau yog 300-800 ℃, feem ntau yog thermal cracking cov tshuaj tiv thaiv, feem ntau yog siv high-temperature hluav taws xob rauv hlau cua sov, theem ua rau ib tug loj npaum li cas ntawm cov pa roj thiab tar,.
Cov yam ntxwv: Cov xim ntawm cov fiber ntau pre-oxidized yuav tsaus dua, feem ntau yog xim dub, tab sis tseem khaws cov morphology ntawm cov fiber ntau, cov qauv sab hauv tau dhau los ntawm qee qhov kev hloov tshuaj lom neeg, tsim kom muaj cov pa oxygen-muaj cov haujlwm ua haujlwm thiab cov qauv sib txuas, tso lub hauv paus rau carbonization tom ntej.
2. (High-kub) carbonization theem, yog lub pre-oxidation ntawm precursor nyob rau hauv ib tug inert cua nyob rau hauv high kub decomposition, tshem tawm uas ntxiv rau carbon heteroatoms (xws li oxygen, hydrogen, nitrogen, thiab lwm yam), kom cov gradual carbonization, tsim ntawm amorphous carbon los yog microcrystalline carbon qauv. Cov txheej txheem no yog ib kauj ruam tseem ceeb hauv kev tsim cov pob txha pob txha. Qhov kub yog feem ntau ntawm 1000-1800 ℃, feem ntau yog thermal condensation cov tshuaj tiv thaiv, feem ntau ntawm cov graphite cua sov yog siv rau cua sov.
Yam ntxwv: Cov khoom 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, txhua yam khoom piv rau cov khoom ua ntej oxidation muaj qhov nce ntxiv.
3. Graphitizationyog ib qho kev kho cua sov ntxiv ntawm cov khoom siv carbonization ntawm qhov kub siab dua los txhawb cov qauv ntawm amorphous carbon lossis microcrystalline carbon rau cov qauv graphite siv lead ua ntau dua. Los ntawm qhov kev txiav txim ntawm qhov kub thiab txias, cov pa roj carbon atoms yog reranged los ua ib tug hexagonal lattice txheej txheej nrog high degree ntawm orientation, yog li no ho txhim kho cov hluav taws xob thiab thermal conductivity thiab mechanical zog ntawm cov khoom.
Yam ntxwv: Cov khoom graphitized muaj cov qauv crystalline graphite heev, uas muab cov hluav taws xob zoo heev thiab thermal conductivity, nrog rau lub zog tshwj xeeb thiab cov qauv tshwj xeeb. Piv txwv li, high-moduluscarbon fiberstau txais los ntawm qib siab ntawm graphitization.
Cov kauj ruam tshwj xeeb thiab cov cuab yeej siv rau kev ua ntej oxidation, carbonization thiab graphitization:
Pre-oxidation: nqa tawm hauv huab cua ntawm qhov ntsuas kub ntawm 200-300 ° C. Kev nruj yuav tsum tau siv los txo cov fiber ntau shrinkage.
Carbonization: nqa tawm nyob rau hauv ib qho chaw inert nrog ib tug maj mam nce nyob rau hauv qhov kub thiab txias mus rau 1000-2000 ° C.
Graphitization: nqa tawm ntawm qhov kub siab dua (2000-3000 ° C), feem ntau hauv lub tshuab nqus tsev lossis hauv qhov chaw tsis muaj zog.
Post lub sij hawm: May-22-2025
