Izintambo eziluhlaza ezisuselwe ku-PAN zidinga ukufakwa oksijini kwangaphambili, izinga lokushisa eliphansi lekhabhoni, kanye nezinga lokushisa eliphezulu lekhabhoni ukuze zakheke.imicu ye-carbon, bese kwenziwa i-graphite ukuze kwenziwe imicu ye-graphite. Izinga lokushisa lifinyelela kusuka ku-200 ℃ kuya ku-2000-3000℃, okwenza ukusabela okuhlukile futhi kwakha izakhiwo ezihlukene, ezibuye zibe nezakhiwo ezahlukene.
1. Isigaba se-Pyrolysis:I-pre-oxidation engxenyeni yezinga lokushisa eliphansi, i-carbonization yezinga lokushisa eliphansi engxenyeni yezinga lokushisa eliphezulu
I-Pre-oxidation arylation yenzeka, ubude bemizuzu ecishe ibe yi-100, izinga lokushisa elingu-200-300 ℃, inhloso iwukuba i-thermoplastic PAN linear macromolecular chain ibe isakhiwo se-trapezoidal esingamelani nokushisa kwepulasitiki, ukusabela okuyinhloko kochungechunge lwe-macromolecular of cyclization kanye ne-molecule ye-intermolecular ehambisana ne-crosslinking encane yokukhululwa. Inkomba ye-arylation ngokuvamile i-40-60%.
Izinga lokushisa eliphansi le-carbonizationngokuvamile i-300-800 ℃, ngokuyinhloko ukusabela kokuqhekeka okushisayo, ikakhulukazi kusetshenziswa ukushisa kwentambo yesithando somlilo kagesi ephezulu, isiteji sikhiqiza inani elikhulu legesi yokukhipha kanye netiyela,.
Izici: Umbala we-fiber pre-oxidized uzoba mnyama, ngokuvamile ube mnyama, kodwa usagcina i-morphology ye-fiber, isakhiwo sangaphakathi siye sabhekana nezinga elithile lezinguquko zamakhemikhali, ukwakheka kwenani lamaqembu asebenzayo aqukethe umoya-mpilo kanye nesakhiwo esixhumanisa, ukubeka isisekelo se-carbonization elandelayo.
2. (High-temperature) carbonization stage, i-pre-oxidation yesandulela endaweni engenzi lutho ekuwohlokeni kwezinga lokushisa eliphezulu, ukususwa kwayo ngaphezu kwama-carbon heteroatom (afana ne-oxygen, i-hydrogen, i-nitrogen, njll.), ukuze i-carbonization kancane kancane, ukwakheka kwe-amorphous carbon noma i-microcrystalline carbon structure. Le nqubo iyisinyathelo esibalulekile ekwakhekeni kwe-carbon skeleton. Izinga lokushisa ngokuvamile liphakathi kuka-1000-1800 ℃, ngokuyinhloko ukusabela kwe-condensation okushisayo, iningi lama-heaters e-graphite asetshenziselwa ukufudumeza.
Izici: Ingxenye eyinhloko ye-carbonized material yi-carbon, isakhiwo ikakhulukazi i-amorphous carbon noma isakhiwo se-chaotic graphite, ukuqhutshwa kwayo kagesi, izakhiwo zemishini uma kuqhathaniswa nomkhiqizo wangaphambili we-oxidation unokunyuka okuphawulekayo.
3. I-Graphitizationiyindlela yokwelapha yokushisa eyengeziwe yemikhiqizo ye-carbonization emazingeni okushisa aphezulu ukuze kuthuthukiswe ukwakheka kwekhabhoni ye-amorphous noma i-microcrystalline carbon ukuze kube nesakhiwo sekristalu ehleleke kakhudlwana. Ngesenzo sokushisa okuphezulu, ama-athomu ekhabhoni ahlelwa kabusha ukuze akhe ungqimba lwe-lattice ene-hexagonal enezinga eliphezulu lokuma, ngaleyo ndlela kuthuthukisa kakhulu ukuqhutshwa kukagesi nokushisayo namandla emishini yezinto.
Izici: Umkhiqizo owenziwe nge-graphitized unesakhiwo se-graphite esicwebe kakhulu, esihlinzeka nge-conductivity enhle kakhulu kagesi kanye ne-thermal, kanye namandla athile aphezulu kanye ne-modulus ethize. Ngokwesibonelo, high-modulusimicu ye-carbonatholakala ngezinga eliphezulu le-graphitization.
Izinyathelo eziqondile nezidingo zemishini ye-pre-oxidation, carbonization kanye ne-graphitization:
I-pre-oxidation: yenziwa emoyeni emazingeni okushisa alawulwayo angama-200-300 ° C. I-tension idinga ukusetshenziselwa ukunciphisa ukuncipha kwe-fiber.
I-Carbonization: yenziwa endaweni engasebenzi ngokukhuphuka kancane kwezinga lokushisa ukuya ku-1000-2000°C.
I-Graphitization: yenziwa emazingeni okushisa aphezulu (2000-3000°C), ngokuvamile endaweni engenalutho noma endaweni engenalutho.
Isikhathi sokuthumela: May-22-2025
