Isimiso se-graphitization sihilela ukwelashwa kokushisa okuphezulu (2300–3000°C), okubangela ukuhlelwa kabusha kwama-athomu e-carbon angenawo ukwakheka, aphazamisekile abe yisakhiwo sekristalu se-graphite esinezinhlangothi ezintathu esizinzile ngokwe-thermodynamically. Ingqikithi yale nqubo itholakala ekwakhiweni kabusha kwe-lattice enezinhlangothi eziyisithupha ngokusebenzisa i-SP² hybridization yama-athomu e-carbon, engahlukaniswa ngezigaba ezintathu:
Isigaba Sokukhula Kwe-Microcrystalline (1000–1800°C):
Ngaphakathi kwaleli banga lokushisa, ukungcola ezintweni zekhabhoni (njengezinsimbi ezincibilika kancane, i-sulfur, ne-phosphorus) kuqala ukuhwamuka nokuwohloka, kuyilapho isakhiwo esihleliwe sezingqimba zekhabhoni sikhula kancane kancane. Ukuphakama kwama-microcrystals kuyanda kusukela ku-~1 nanometer yokuqala kuya ku-10 nanometer, okubeka isisekelo sokuhleleka okulandelayo.
Isigaba Sokuhlela Esinezilinganiso Ezintathu (1800–2500°C):
Njengoba izinga lokushisa likhuphuka, ukungalingani phakathi kwezingqimba zekhabhoni kuyancipha, futhi isikhala sezingqimba sincipha kancane kancane sibe ngama-nanometer angu-0.343–0.346 (okusondela enanini elifanele le-graphite lama-nanometer angu-0.335). Izinga le-graphitization liyanda kusuka ku-0 kuya ku-0.9, futhi izinto ziqala ukubonisa izici ezihlukile ze-graphite, njengokuqhuba kukagesi nokushisa okuthuthukisiwe kakhulu.
Isigaba Sokuphelela Kwekristalu (2500–3000°C):
Emazingeni okushisa aphezulu, ama-microcrystal ahlelwa kabusha, futhi amaphutha e-lattice (njengezikhala kanye nokudilika) alungiswa kancane kancane, kanti izinga le-graphitization lisondela ku-1.0 (ikristalu efanele). Kuleli qophelo, ukumelana kukagesi kwezinto kungancipha ngezikhathi ezingu-4-5, ukuhanjiswa kokushisa kuthuthuka cishe izikhathi ezingu-10, i-coefficient of linear expansion yehla ngo-50-80%, kanye nokuzinza kwamakhemikhali kukhuliswa kakhulu.
Ukufakwa kwamandla okushisa okuphezulu kungamandla ayisihluthulelo okushayela i-graphitization, ukunqoba isithiyo samandla sokuhlelwa kabusha kwe-athomu yekhabhoni futhi kuvumele ukuguquka kusuka endaweni engahlelekile kuya esakhiweni esihleliwe. Ngaphezu kwalokho, ukungezwa kwama-catalyst (njenge-boron, insimbi, noma i-ferrosilicon) kunganciphisa izinga lokushisa le-graphitization futhi kukhuthaze ukusabalala kwe-athomu yekhabhoni kanye nokwakheka kwe-lattice. Isibonelo, lapho i-ferrosilicon iqukethe i-silicon engu-25%, izinga lokushisa le-graphitization lingancishiswa kusuka ku-2500–3000°C kuya ku-1500°C, ngenkathi kukhiqizwa i-silicon carbide enezinhlangothi eziyisithupha ukusiza ekwakhekeni kwe-graphite.
Inani lokusetshenziswa kwe-graphitization libonakala ekuthuthukisweni okuphelele kwezakhiwo zezinto ezibonakalayo:
- Ukuqhuba Ugesi: Ngemva kokwenza i-graphitization, ukumelana kukagesi kwezinto kwehla kakhulu, okwenza kube yizinto ezingezona ezensimbi kuphela eziqhuba kahle kakhulu ugesi.
- Ukuqhuba Ukushisa: Ukuqhuba Ukushisa kuthuthuka cishe izikhathi eziyi-10, okwenza kufaneleke ukusetshenziswa kokuphathwa kokushisa.
- Ukuzinza Kwamakhemikhali: Ukumelana ne-oxidation kanye nokumelana nokugqwala kuyathuthukiswa, okwandisa impilo yenkonzo yezinto.
- Izakhiwo Zemishini: Nakuba amandla engase anciphe, isakhiwo semibhobho singathuthukiswa ngokufaka i-impregnation, ukwanda kobuningi kanye nokumelana nokuguguleka.
- Ukuthuthukiswa Kobumsulwa: Ukungcola kuyashintshashintsha emazingeni okushisa aphezulu, kunciphisa okuqukethwe komlotha womkhiqizo cishe izikhathi ezingu-300 futhi kuhlangatshezwane nezidingo zobumsulwa obuphezulu.
Isibonelo, ezintweni ze-anode zebhethri le-lithium-ion, i-graphitization iyisinyathelo esibalulekile ekulungiseleleni ama-anode e-graphite okwenziwa. Ngokwelashwa kwe-graphitization, ubuningi bamandla, ukuzinza komjikelezo, kanye nokusebenza kwesilinganiso sezinto ze-anode kuthuthukiswa kakhulu, okuthinta ngqo ukusebenza kwebhethri iyonke. Amanye ama-graphite emvelo nawo aphathwa ngokushisa okuphezulu ukuze athuthukise izinga lawo le-graphitization, ngaleyo ndlela athuthukise ubuningi bamandla kanye nokusebenza kahle kokukhipha ishaja.
Isikhathi sokuthunyelwe: Septhemba-09-2025