Momwe mungasiyanitsire kusiyana pakati pa pre-oxidation/carbonization/graphitization

Mawaya osaphika okhala ndi PAN ayenera kusinthidwa kukhala oxidized, carbonized otsika kutentha, ndi carbonized kukhala kutentha kwambiri kuti apange mawonekedwe.ulusi wa kaboni, kenako n’kupangidwa ndi graphite kuti apange ulusi wa graphite. Kutentha kumafika pa 200℃ mpaka 2000-3000℃, komwe kumachita zinthu zosiyanasiyana ndikupanga mapangidwe osiyanasiyana, omwe nawonso ali ndi makhalidwe osiyanasiyana.
1. Gawo la pyrolysis:Kusungunuka kwa okosijeni mu gawo lotentha pang'ono, kusungunuka kwa kaboni mu gawo lotentha kwambiri
Kuchuluka kwa okosijeni kumachitika mu arylation, pafupifupi mphindi 100, kutentha kwa 200-300 ℃, cholinga chake ndi kuyika unyolo wa macromolecular wa PAN mu kapangidwe ka trapezoidal kosakhala pulasitiki, komwe kumayambitsa kusinthasintha kwa macromolecular unyolo ndi intermolecular crosslinking, limodzi ndi pyrolysis reaction ndi kutulutsidwa kwa mamolekyulu ambiri ang'onoang'ono. Chizindikiro cha arylation nthawi zambiri chimakhala 40-60%.
Kutentha kotsika kwa carbonizationNthawi zambiri zimakhala 300-800 ℃, makamaka kutentha komwe kumaphwanyika, makamaka pogwiritsa ntchito waya wamagetsi wotenthetsera kutentha kwambiri, sitejiyi imapanga mpweya wambiri wotulutsa utsi ndi phula.
Makhalidwe: Mtundu wa ulusi womwe umakhalapo kale udzakhala wakuda, nthawi zambiri wakuda, koma umasungabe mawonekedwe a ulusiwo, kapangidwe ka mkati kamasintha mankhwala, kupangidwa kwa magulu angapo ogwira ntchito okhala ndi mpweya ndi kapangidwe kolumikizana, zomwe zimayika maziko a carbonization yotsatira.
2. Gawo la (kutentha kwambiri) la carbonization, ndi pre-oxidation ya precursor mumlengalenga wopanda mpweya pa kutentha kwakukulu, kuchotsa komwe kuwonjezera pa heteroatoms za kaboni (monga mpweya, haidrojeni, nayitrogeni, ndi zina zotero), kotero kuti pang'onopang'ono carbonization, mapangidwe a amorphous carbon kapena microcrystalline carbon structure. Njirayi ndi gawo lofunika kwambiri pakupanga mafupa a kaboni. Kutentha nthawi zambiri kumakhala pakati pa 1000-1800 ℃, makamaka kutentha kwa condensation reaction, ma heater ambiri a graphite amagwiritsidwa ntchito potenthetsera.
Makhalidwe: Gawo lalikulu la zinthu zopangidwa ndi kaboni ndi kaboni, kapangidwe kake kamakhala ndi mpweya wosasinthasintha kapena kapangidwe ka graphite, mphamvu zake zamagetsi, mphamvu zamakanika poyerekeza ndi zomwe zimapangidwa ndi pre-oxidation zimawonjezeka kwambiri.
3. Kujambula zithunziNdi njira ina yotenthetsera zinthu zoyeretsera mpweya pa kutentha kwakukulu kuti zilimbikitse kapangidwe ka kaboni wosapanga mawonekedwe kapena kaboni kakang'ono ka microcrystalline kukhala kapangidwe ka kristalo ka graphite kolongosoka bwino. Kudzera mu kutentha kwambiri, maatomu a kaboni amakonzedwanso kuti apange kapangidwe ka hexagonal lattice layer yokhala ndi mawonekedwe apamwamba, motero kumawonjezera kwambiri mphamvu zamagetsi ndi kutentha komanso mphamvu zamakanika za zinthuzo.
Makhalidwe: Chogulitsa chojambulidwacho chili ndi kapangidwe ka graphite kolimba kwambiri, komwe kumapereka mphamvu zamagetsi ndi kutentha kwabwino kwambiri, komanso mphamvu zapadera komanso modulus yapadera. Mwachitsanzo, modulus yapamwambaulusi wa kaboniZimapezeka chifukwa cha graphitization yapamwamba kwambiri.
Masitepe enieni ndi zofunikira pa zida zogwiritsira ntchito pre-oxidation, carbonization ndi graphitization:
Kusakaniza kwa okosijeni: kumachitika mumlengalenga pa kutentha kolamulidwa kwa 200-300°C. Kupsinjika kuyenera kugwiritsidwa ntchito kuti muchepetse kuchepa kwa ulusi.
Kutulutsa mpweya m'mlengalenga wopanda mpweya komanso kutentha pang'onopang'ono kufika pa 1000-2000°C.
Kujambula zithunzi: kumachitika kutentha kwambiri (2000-3000°C), nthawi zambiri mu vacuum kapena mumlengalenga wopanda mpweya.