Yiziphi izimiso ezibalulekile zenqubo ye-graphitization?

I-Graphitization inqubo eyinhloko eguqula izinto ze-carbonaceous ezingasebenzi kahle, eziphazamisekile zibe yisakhiwo se-graphitic crystalline esihlelekile, kanye nemingcele yaso ebalulekile ethonya ngqo izinga le-graphitization, izakhiwo zezinto, kanye nokusebenza kahle kokukhiqiza. Ngezansi kunemingcele yenqubo ebalulekile kanye nokucatshangelwa kobuchwepheshe kwe-graphitization:

I. Amapharamitha Okushisa Okuyinhloko

Ibanga Lokushisa Eliqondiwe
Ukufakwa kwe-graphitization kudinga izinto zokushisa ezifinyelela ku-2300–3000℃, lapho:

• U-2500℃ uphawula iphuzu elibalulekile lokunciphisa okukhulu isikhala phakathi kwezingqimba ze-graphite, okuqalisa ukwakheka kwesakhiwo okuhlelekile;
• Ku-3000℃, i-graphitization isondela ekupheleni, lapho isikhala se-interlayer sizinza ku-0.3354 nm (inani elifanele le-graphite) kanye ne-graphitization degree edlula u-90%.

Isikhathi Sokubamba Izinga Lokushisa Eliphezulu

• Gcina izinga lokushisa eliqondiwe amahora angu-6-30 ukuqinisekisa ukusatshalaliswa okufanayo kwezinga lokushisa lesithando;
• Kudingeka amahora angu-3-6 engeziwe okugcina amandla ngesikhathi sokuphakelwa kukagesi ukuze kuvinjelwe ukubuyela emuva kokumelana nokugwema ukukhubazeka kwe-lattice okubangelwa ukushintshashintsha kwezinga lokushisa.

II. Ukulawula Ijika Lokushisa

Isu Lokushisa Elihleliwe

• Isigaba sokuqala sokushisa (0–1000℃): Silawulwa ku-50℃/h ukukhuthaza ukukhishwa kancane kancane kwezinto eziguquguqukayo (isb., i-tar, amagesi) nokuvimbela ukuqhuma kwesithando somlilo;
• Isigaba sokushisa (1000–2500℃): Sikhuphukela ku-100℃/h njengoba ukumelana kukagesi kuncipha, lapho amandla kagesi elungiswa ukuze kugcinwe amandla;
• Isigaba sokuphinda kuhlanganiswe kwezinga lokushisa eliphezulu (2500–3000℃): Sigcinwa amahora angama-20–30 ukuze kuqedwe ukulungiswa kwe-lattice defect kanye nokuhlelwa kabusha kwe-microcrystalline.

Ukuphathwa Okuguquguqukayo

• Izinto zokusetshenziswa kumele zixutshwe ngokusekelwe kokuqukethwe okuguquguqukayo ukuze kugwenywe ukugcwala kwendawo;
• Izimbobo zokungenisa umoya zinikezwa ekushiseni okuphezulu ukuqinisekisa ukuphuma okuguquguqukayo okuphumelelayo;
• Ijika lokushisa liyehliswa ngesikhathi sokukhishwa kwegesi okuguquguqukayo okuphezulu (isb., 800–1200℃) ukuvimbela ukusha okungaphelele kanye nokukhiqizwa kwentuthu emnyama.

III. Ukuthuthukiswa Kokulayisha Isithando Somlilo

Ukusatshalaliswa Kwezinto Zokumelana Ezifanayo

• Izinto zokumelana kufanele zisatshalaliswe ngokulinganayo kusukela ekhanda lesithando kuya emsileni ngokulayisha okude ukuze kuvinjelwe imisinga yokukhetha ebangelwa ukuhlangana kwezinhlayiya;
• Izitsha zokubhaka ezintsha nezisetshenzisiwe kumele zixutshwe ngendlela efanele futhi zingavunyelwe ukufakwa ezingqimbeni ukuze kugwenywe ukushisa ngokweqile ngenxa yokwehluka kokumelana.

Ukukhethwa Kwezinto Ezisizayo Nokulawulwa Kosayizi Wezinhlayiyana

• ≤10% wezinto ezisizayo kufanele zibe nezinhlawulo ezingu-0–1 mm ukuze kuncishiswe ukumelana okungalingani;
• Izinto ezisizayo ezinomlotha ophansi (<1%) kanye nezinto eziguquguqukayo eziphansi (<5%) zibekwa phambili ukuze kuncishiswe izingozi zokumuncwa kokungcola.

IV. Ukulawula Ukupholisa Nokuthulula Izinto

Inqubo Yokupholisa Yemvelo

• Ukupholisa ngenkani ngokufafaza ngamanzi akuvunyelwe; esikhundleni salokho, izinto zisuswa ungqimba nongqimba kusetshenziswa izinto zokubamba noma amadivayisi okumunca ukuze kuvinjelwe ukuqhekeka kokucindezeleka kokushisa;
• Isikhathi sokupholisa kumele sibe yizinsuku ezingu-≥7 ukuqinisekisa ukwehla kwezinga lokushisa kancane kancane ngaphakathi kwento.

Ukushisa Nokuphathwa Kokukhuhla Kokulahlwa

• Ukwehliswa kwempahla okuhle kakhulu kwenzeka lapho izinto zokumboza zifinyelela ku-~150℃; ukususwa ngaphambi kwesikhathi kubangela ukubola kwezinto (indawo ethile yobuso eyandisiwe) kanye nomonakalo wezinto zokumboza;
• Uqweqwe oluyi-1-5 mm ubukhulu (oluqukethe ukungcola okuncane) lwakheka ezindaweni ezibanjiswayo ngesikhathi sokukhipha impahla futhi kumele lugcinwe ngokwehlukana, ngezinto ezifanele zipakishwe ezikhwameni zamathani ukuze zithunyelwe.

V. Ukulinganiswa Kwezinga Lokudweba I-Graphitization kanye Nobudlelwano Bempahla

Izindlela Zokulinganisa

• I-X-ray Diffraction (XRD): Ibala isikhala se-interlayer d002​ ngesikhundla se-(002) diffraction peak, nge-graphitization degree g etholakala kusetshenziswa ifomula kaFranklin:

(lapho i-c0​ kuyisikhala esilinganiselwe phakathi kwezingqimba; g=84.05% lapho i-d002​=0.3360nm).

• I-Raman Spectroscopy: Ilinganisa izinga le-graphitization ngesilinganiso sokuqina kwe-D-peak kuya ku-G-peak.

Umthelela Wempahla

• Ukwanda ngakunye okungu-0.1 kwezinga le-graphitization kunciphisa ukumelana ngo-30% futhi kwandisa ukuhanjiswa kokushisa ngo-25%;
• Izinto ezifakwe igrafu ephezulu (>90%) zifinyelela ukuhanjiswa komoya okufika ku-1.2×10⁵ S/m, yize ukuqina komthelela kungase kwehle, okudinga amasu ezinto ezihlanganisiwe ukuze kulinganiswe ukusebenza.

VI. Ukuthuthukiswa Kwepharamitha Yenqubo Ethuthukisiwe

I-Catalytic Graphitization

• Ama-catalyst ensimbi/nickel akha izigaba eziphakathi ze-Fe₃C/Ni₃C, ehlisa izinga lokushisa le-graphitization libe ngu-2200℃;
• Ama-catalyst e-boron ahlangana abe yizingqimba zekhabhoni ukuze akhuthaze ukuhleleka, okudinga ama-2300℃.

I-Graphitization Yokushisa Okuphezulu Kakhulu

• Ukushisa kwe-arc ye-plasma (izinga lokushisa eliyinhloko le-argon plasma: 15,000℃) kufinyelela amazinga okushisa aphezulu angu-3200℃ kanye nama-graphitization degrees >99%, afanele i-graphite ye-nuclear-grade kanye ne-aerospace-grade.

I-Microwave Graphitization

• Ama-microwave angu-2.45 GHz avusa ukudlidliza kwe-athomu yekhabhoni, okwenza amazinga okushisa abe ngu-500℃/min ngaphandle kokushintsha kwezinga lokushisa, yize kunqunyelwe ezingxenyeni ezinamadonga amancane (<50 mm).