Ibhekisela kuphi ngempela inqubo "yokwenza i-graphitization"?

"Ukuguqulwa kwe-Graphitization"

“I-Graphitization” ibhekisela enkambisweni yokwelapha ukushisa okushisa okuphezulu (ngokuvamile eyenziwa ku-2000°C kuya ku-3000°C noma ngaphezulu) eguqula isakhiwo esincane sezinto ze-carbonaceous (njenge-petroleum coke, i-coal tar pitch, i-anthracite coal, njll.) kusuka esimweni esingahlelekile noma esihlelekile sibe yisakhiwo sekristalu esinezingqimba ezifana ne-graphite yemvelo. Ingqikithi yale nqubo itholakala ekuhleleni kabusha okuyisisekelo kwama-athomu e-carbon, okunikeza izinto izakhiwo zomzimba nezamakhemikhali ezihlukile ezibonakala ku-graphite.

Inqubo Eningiliziwe kanye Nokusebenza Kwe-Graphitization

Izigaba Zokwelapha Ukushisa

1. Indawo Yokushisa Okuphansi (<1000°C)
   • Izingxenye eziguquguqukayo (isb., umswakama, ama-hydrocarbon alula) ziyashintsha kancane kancane, futhi isakhiwo siqala ukufinyela kancane. Kodwa-ke, ama-athomu e-carbon ahlala engahlelekile noma ehlelekile isikhathi esifushane.
2. Indawo Yokushisa Okumaphakathi (1000–2000°C)
   • Ama-athomu e-carbon aqala ukuhlela kabusha ngokunyakaza kokushisa, akha izakhiwo zenethiwekhi ezinezinhlangothi eziyisithupha ezihlelwe endaweni (ezifana nesakhiwo se-graphite esingaphakathi). Kodwa-ke, ukuhambisana kwezingqimba kusalokhu kungahlelekile.
3. Indawo Yokushisa Okuphezulu (>2000°C)
   • Ngaphansi kokuchayeka isikhathi eside ekushiseni okuphezulu, izendlalelo zekhabhoni ziyavumelana kancane kancane, zakha isakhiwo sekristalu esinezingqimba ezintathu (isakhiwo esinamagrafu). Amandla aphakathi kwezendlalelo ayancipha (ukuxhumana kwe-van der Waals), kuyilapho amandla esibopho se-covalent ngaphakathi kwendiza ekhuphuka.

Ukuguqulwa Okubalulekile Kwesakhiwo

• Ukuhlelwa Kabusha Kwe-Athomu Yekhabhoni: Ukuguquka kusuka esakhiweni "esiguquguqukayo" esingaguquki kuya esakhiweni "esinezingqimba" esihleliwe, esinama-athomu ekhabhoni angaphakathi enza izibopho ze-covalent ezihlanganisiwe ze-sp² kanye nokubopha phakathi kwezingqimba ngokusebenzisa amandla e-van der Waals.
• Ukususwa Kwamaphutha: Amazinga okushisa aphezulu anciphisa amaphutha ekristalu (isb., izikhala, ukuhlukana), okuthuthukisa ubukristalu kanye nobuqotho besakhiwo.

Izinhloso Eziyinhloko Zokwenza I-Graphitization

1. Ukuthuthukiswa Kokusebenza Kukagesi
   • Ama-athomu ekhabhoni ahleliwe adala inethiwekhi yokuqhuba, evumela ukunyakaza kwama-electron mahhala ngaphakathi kwezingqimba futhi inciphisa kakhulu ukumelana (isb., i-graphitized petroleum coke ibonisa ukumelana okuphansi ngokuphindwe kayishumi kunezinto ezingezona i-graphitized).
   • Izicelo: Ama-electrode ebhethri, amabhulashi ekhabhoni, izingxenye zemboni kagesi ezidinga ukuhanjiswa okuphezulu.
2. Ukuqina Okuthuthukisiwe Kokushisa
   • Izakhiwo ezihlelekile ziyamelana nokubola noma ukubola emazingeni okushisa aphezulu, okwandisa ukumelana nokushisa (isb., izinto ezifakwe i-graphit zimelana no->3000°C ezindaweni ezingasebenzi kahle).
   • Izicelo: Izinto ezivuselela umoya, izitsha zokushisa eziphakeme, izinhlelo zokuvikela ukushisa zezindiza.
3. Izakhiwo Zemishini Ezilungiselelwe
   • Nakuba i-graphitization inganciphisa amandla aphelele (isb., ukwehla kwamandla okucindezela), isakhiwo esinezingqimba sethula i-anisotropy, sigcina amandla aphezulu ngaphakathi futhi sinciphise ukuqhekeka.
   • Izicelo: Ama-electrode e-Graphite, amabhlogo amakhulu e-cathode adinga ukumelana nokushaqeka kokushisa kanye nokumelana nokuguguleka.
4. Ukuqina Kwamakhemikhali Okwandayo
   • Ukuqina okuphezulu kwekristalu kunciphisa izindawo ezisebenzayo ebusweni, kunciphisa amazinga okusabela nge-oxygen, ama-acid, noma izisekelo, futhi kuthuthukisa ukumelana nokugqwala.
   • Izicelo: Izitsha zamakhemikhali, ulwelwesi lwe-electrolyzer ezindaweni ezigqwalisayo.

Izici Ezithonya Ukuguqulwa Kwezithombe

1. Izakhiwo Zezinto Ezingavuthiwe
   • Okuqukethwe okuphezulu kwekhabhoni okungaguquki kwenza kube lula ukwenziwa kwe-graphitization (isb., i-petroleum coke graphiting kalula kune-coal tar pitch).
   • Ukungcola (isb., isibabule, i-nitrogen) kuvimbela ukuhlelwa kabusha kwe-athomu futhi kudinga ukwelashwa kusengaphambili (isb., ukususwa kwesibabule).
2. Izimo Zokwelapha Ukushisa
   • Izinga Lokushisa: Izinga lokushisa eliphakeme lithuthukisa izinga lokudweba kodwa likhulisa izindleko zemishini kanye nokusetshenziswa kwamandla.
   • Isikhathi: Izikhathi zokubamba ezinde zithuthukisa ukuphelela kwesakhiwo, kodwa isikhathi esiningi singabangela ukujiya kwezinhlamvu kanye nokwehla kokusebenza.
   • Umkhathi: Izindawo ezingasebenzi kahle (isb., i-argon) noma ama-vacuum avimbela i-oxidation futhi akhuthaze ukusabela kwe-graphitization.
3. Izithasiselo
   • Ama-Catalyst (isb., i-boron, i-silicon) anciphisa amazinga okushisa e-graphitization futhi athuthukise ukusebenza kahle (isb., ukusebenzisa i-boron doping kunciphisa amazinga okushisa adingekayo ngo-~500°C).

Ukuqhathaniswa kwezinto ezifakwe i-Graphitized vs. Non-Graphitized

Amacala Okusebenza Okusebenzayo

1. Ama-Electrode e-Graphite
   • I-petroleum coke noma i-coal tar pitch i-graphitized ukuze ikhiqize ama-electrode anamandla aphezulu okwenza insimbi yesithando sikagesi se-arc, ahlala isikhathi eside >3000°C kanye nemisinga enamandla.
2. Ama-Anode ebhethri le-Lithium-Ion
   • I-graphite yemvelo noma yokwenziwa (efakwe i-graphitized) isebenza njengezinto ze-anode, isebenzisa isakhiwo sayo esinezingqimba ukuze kuhlanganiswe/kususwe i-lithium-ion ngokushesha, kuthuthukiswe ukusebenza kahle kokushaja/ukukhipha.
3. Ukwenza i-Carburizer ngensimbi
   • I-graphitized petroleum coke, enesakhiwo sayo esinezimbobo kanye nokuqukethwe okuphezulu kwekhabhoni, ikhulisa ngokushesha okuqukethwe kwekhabhoni ensimbini encibilikisiwe ngenkathi inciphisa ukungcola kwesibabule.