Mawaya aiwisi opangidwa ndi PAN amafunika kukhala oxidized, kutentha pang'ono, komanso kutentha kwambiri kuti apangecarbon fiber, kenako amajambula kuti apange ulusi wa graphite. Kutentha kumafika pa 200 ℃ mpaka 2000-3000 ℃, zomwe zimagwira ntchito zosiyanasiyana ndikupanga mapangidwe osiyanasiyana, omwe amakhala ndi zinthu zosiyanasiyana.
1. Gawo la pyrolysis:Pre-oxidation mu gawo lotsika kutentha, kutsika kwa carbonization mu gawo lotentha kwambiri
Pre-oxidation arylation imapezeka, kutalika kwa pafupifupi mphindi 100, kutentha kwa 200-300 ℃, cholinga chake ndi thermoplastic PAN liniya macromolecular unyolo mu sanali pulasitiki kutentha zosagwira trapezoidal dongosolo, anachita chachikulu cha macromolecular unyolo wa cyclization ndi intermolecular kumasulidwa ambiri crosslinking ndi kumasulidwa ang'onoang'ono. Mlozera wa arylation nthawi zambiri ndi 40-60%.
Kutentha kochepa kwa carbonization kutenthazambiri 300-800 ℃, makamaka matenthedwe akulimbana anachita, makamaka ntchito mkulu-kutentha magetsi ng'anjo waya Kutentha, siteji umapanga kuchuluka kwa mpweya utsi ndi phula,.
Makhalidwe: Mtundu wa chisanadze oxidized CHIKWANGWANI adzakhala mdima, nthawi zambiri wakuda, koma amasungabe morphology wa CHIKWANGWANI, kapangidwe mkati wadutsa mlingo wina wa kusintha kwa mankhwala, mapangidwe angapo mpweya munali magulu zinchito ndi mtanda kugwirizana dongosolo, kuika maziko a wotsatira carbonization.
2. (Kutentha kwambiri) carbonization siteji, ndi chisanadze makutidwe ndi okosijeni wa kalambulabwalo m'mlengalenga inert pa kutentha kutentha kuwonongeka, kuchotsa amene kuwonjezera carbon heteroatoms (monga mpweya, haidrojeni, nayitrogeni, etc.), kuti pang'onopang'ono carbonization, mapangidwe amorphous mpweya kapena microcrystalline mpweya dongosolo. Njira imeneyi ndi sitepe yofunika kwambiri pakupanga mafupa a carbon. Kutentha nthawi zambiri kumakhala pakati pa 1000-1800 ℃, makamaka matenthedwe a condensation reaction, ambiri mwa ma graphite heaters amagwiritsidwa ntchito pakuwotha.
Makhalidwe: chigawo chachikulu cha zinthu carbonized ndi mpweya, kapangidwe ndi makamaka amorphous mpweya kapena chaotic graphite dongosolo, madutsidwe magetsi, mawotchi katundu poyerekeza ndi chisanadze makutidwe ndi okosijeni mankhwala ali ndi kuwonjezeka kwambiri.
3. Kujambula zithunzindi zina kutentha mankhwala carbonization mankhwala pa kutentha kwambiri kulimbikitsa dongosolo amorphous mpweya kapena microcrystalline mpweya kuti mwadongosolo graphite galasi galasi. Kupyolera mu kutentha kwakukulu, maatomu a carbon amakonzedwanso kuti apange mawonekedwe a hexagonal lattice ndi mlingo wapamwamba wa kulunjika, motero amawongolera kwambiri magetsi ndi matenthedwe madutsidwe ndi mphamvu zamakina za zinthuzo.
Makhalidwe: Chopangidwa ndi graphitized chimakhala ndi mawonekedwe owoneka bwino kwambiri a graphite, omwe amapereka ma conductivity abwino kwambiri amagetsi ndi matenthedwe, komanso mphamvu zapadera komanso modulus yeniyeni. Mwachitsanzo, high-moduluscarbon fiberamapezedwa kudzera mu digiri yapamwamba ya graphitization.
Masitepe apadera ndi zida zofunikira pa pre-oxidation, carbonization ndi graphitization:
Pre-oxidation: imachitika mumlengalenga pa kutentha kolamulidwa kwa 200-300 ° C. Kupanikizika kuyenera kugwiritsidwa ntchito kuti muchepetse kuchepa kwa fiber.
Mpweya wa carbon: umachitika m'malo opanda mpweya ndi kutentha kwapang'onopang'ono mpaka 1000-2000 ° C.
Graphitization: imachitika pa kutentha kwambiri (2000-3000 ° C), nthawi zambiri mopanda phokoso kapena mumlengalenga.
Nthawi yotumiza: May-22-2025
