Mene ne mahimman sigogin tsari na tsarin graphitization?

Grafitization wani muhimmin tsari ne wanda ke canza kayan carbon marasa tsari zuwa tsarin kristal mai tsari, tare da mahimman sigoginsa waɗanda ke tasiri kai tsaye ga matakin graphitization, halayen kayan aiki, da ingancin samarwa. Ga mahimman sigogin tsari da la'akari da fasaha don graphitization:

I. Sigogi na Zafin Jiki na Core

Nisan Zafin da Aka Yi Niyya
Graphitization yana buƙatar kayan dumama zuwa 2300–3000℃, inda:

• 2500℃ alama ce mai mahimmanci ga raguwar tazara tsakanin layukan graphite, wanda ke fara tsarin tsari mai tsari;
• A zafin 3000℃, graphitization ya kusa kammalawa, tare da daidaita tazara tsakanin layukan a 0.3354 nm (ƙimar graphite mai kyau) da kuma matakin graphitization ya wuce 90%.

Lokacin Rike Zafi Mai Tsayi

• A kiyaye zafin da aka yi niyya na tsawon awanni 6-30 domin tabbatar da rarraba yanayin zafin tanderu iri ɗaya;
• Ana buƙatar ƙarin sa'o'i 3-6 na riƙewa yayin samar da wutar lantarki don hana sake dawowa da juriya da kuma guje wa lahani na layin da ke haifar da canjin yanayin zafi.

II. Kula da Lanƙwasa Dumama

Tsarin Dumama Mai Tsari

• Matakin farko na dumama (0–1000℃): Ana sarrafa shi a 50℃/h don haɓaka sakin abubuwa masu canzawa a hankali (misali, kwalta, iskar gas) da kuma hana fashewar tanderu;
• Matakin dumama (1000–2500℃): An ƙara zuwa 100℃/h yayin da juriyar lantarki ke raguwa, tare da daidaita wutar lantarki don kiyaye wutar lantarki;
• Matakin sake haɗakar zafi mai yawa (2500–3000℃): Ana riƙe shi na tsawon awanni 20-30 don kammala gyaran lahani na lattice da sake tsara microcrystalline.

Gudanar da Sauyi

• Dole ne a haɗa kayan da aka samo bisa ga abubuwan da ke canzawa don guje wa yawan da ake samu a cikin gida;
• Ana samar da ramukan iska a cikin rufin sama don tabbatar da ingantaccen gudu mai canzawa;
• Ana rage saurin dumama yayin fitar da hayaki mai ƙarfi (misali, 800–1200℃) don hana ƙonewa mara cikakke da kuma samar da hayaki baƙi.

III. Inganta Loda Wutar Lantarki

Rarraba Kayan Juriya Mai Daidaito

• Ya kamata a rarraba kayan juriya daidai gwargwado daga kan tanda zuwa wutsiya ta hanyar ɗaukar kaya mai tsayi don hana kwararar ruwa ta hanyar taruwar ƙwayoyin cuta;
• Dole ne a haɗa sabbin da aka yi amfani da su yadda ya kamata kuma a hana a tara su a cikin yadudduka don guje wa zafi fiye da kima a wurare daban-daban saboda bambancin juriya.

Zaɓin Kayan Aiki da Sarrafa Girman Barbashi

• ≤10% na kayan taimako ya kamata ya ƙunshi tarar 0-1 mm don rage rashin jituwa tsakanin juriya;
• Ana ba da fifiko ga kayan taimako masu ƙarancin toka (<1%) da waɗanda ba su da ƙarancin canzawa (<5%) don rage haɗarin shaye-shaye daga ƙazanta.

IV. Kula da Sanyaya da Saukewa

Tsarin Sanyaya na Halitta

• An haramta tilasta sanyaya ta hanyar feshi da ruwa; maimakon haka, ana cire kayan ta hanyar amfani da na'urorin kamawa ko tsotsa don hana fashewar damuwa ta zafi;
• Dole ne lokacin sanyaya ya zama ≥ kwana 7 domin tabbatar da yanayin zafi a hankali a cikin kayan.

Sauke Zafin Jiki da Kula da Ƙwayoyin

• Saukewa mafi kyau yana faruwa ne lokacin da bututun ruwa suka kai ~150℃; cirewa da wuri yana haifar da iskar shaka ta abu (ƙara yankin musamman na saman) da lalacewar bututun ruwa;
• Bawon burodi mai kauri mm 1-5 (wanda ke ɗauke da ƙananan ƙazanta) yana samuwa a saman da za a iya sauke kayan abinci yayin da ake sauke kayan kuma dole ne a adana su daban, tare da kayan da aka ƙera a cikin jakunkuna masu yawa don jigilar kaya.

V. Ma'aunin Digiri na Graphitization da Alaƙar Kadara

Hanyoyin Aunawa

• Rarrabawar X-ray (XRD): Yana ƙididdige tazara tsakanin layukan d002​ ta hanyar matsayin kololuwar rarrabawar (002), tare da digirin graphitization g da aka samo ta amfani da dabarar Franklin:

(inda c0​ shine tazara tsakanin layukan da aka auna; g=84.05% idan d002​=0.3360nm).

• Raman Spectroscopy: Ana ƙiyasta digirin graphitization ta hanyar rabon ƙarfi na D-peak zuwa G-peak.

Tasirin Kadara

• Kowace ƙaruwar digirin graphitization 0.1 tana rage juriya da kashi 30% kuma tana ƙara yawan zafin jiki da kashi 25%.
• Kayan da aka yi wa graphitized sosai (>90%) suna samun ƙarfin watsawa har zuwa 1.2×10⁵ S/m, kodayake ƙarfin tasirin na iya raguwa, wanda ke buƙatar dabarun kayan haɗin gwiwa don daidaita aiki.

VI. Inganta Sigogi na Ci gaba

Graphitization na Catalytic

• Masu haɓaka ƙarfe/nickel suna samar da matakai na matsakaici na Fe₃C/Ni₃C, suna rage zafin graphitization zuwa 2200℃;
• Masu haɓaka Boron suna haɗuwa cikin yadudduka na carbon don haɓaka tsari, suna buƙatar 2300℃.

Graphitization mai zafi sosai

• Dumama arc na plasma (zafin core na argon plasma: 15,000℃) yana cimma yanayin zafi na saman 3200℃ da digiri na graphitization >99%, wanda ya dace da graphite na nukiliya da kuma graphite na sararin samaniya.

Graphitization na Microwave

• Microwaves na 2.45 GHz suna motsa girgizar ƙwayar carbon, suna ba da damar dumamawa na 500 ℃/min ba tare da yanayin zafi ba, kodayake an iyakance su ga sassan da ke da sirara (<50 mm).