Graphitization yog dab tsi?
Kev ua kom muaj graphitization yog ib qho txheej txheem kev lag luam uas cov pa roj carbon hloov mus ua graphite. Qhov no yog qhov kev hloov pauv me me uas tshwm sim hauv cov hlau carbon lossis cov hlau tsis tshua muaj hlau uas raug rau qhov kub ntawm 425 txog 550 degrees Celsius rau lub sijhawm ntev, hais tias 1,000 teev. Qhov no yog ib hom kev tawg. Piv txwv li, cov hlau carbon-molybdenum feem ntau muaj pearlite (kev sib xyaw ntawm ferrite thiab cementite). Thaum cov khoom siv raug graphitized, nws ua rau pearlite lwj mus ua ferrite thiab graphite faib tsis raws cai. Qhov no ua rau embrittlement ntawm cov hlau thiab txo qis lub zog thaum cov graphite me me no raug faib tsis raws cai thoob plaws hauv lub matrix. Txawm li cas los xij, peb tuaj yeem tiv thaiv graphitization los ntawm kev siv cov khoom siv uas muaj kev tiv thaiv siab dua uas tsis tshua muaj kev cuam tshuam rau graphitization. Tsis tas li ntawd, peb tuaj yeem hloov kho qhov chaw ib puag ncig los ntawm, piv txwv li, nce pH lossis txo cov ntsiab lus chloride. Lwm txoj hauv kev los tiv thaiv graphitization suav nrog kev siv txheej. Kev tiv thaiv cathodic ntawm cov hlau cam khwb cia.
Carbonization yog dab tsi?
Kev ua kom cov pa roj carbon dioxide yog ib txoj kev lag luam uas cov organic raug hloov mus ua carbon. Cov organic uas peb tab tom xav txog ntawm no suav nrog cov nroj tsuag thiab tsiaj txhu lub cev tuag. Cov txheej txheem no tshwm sim los ntawm kev rhuav tshem cov pa roj carbon dioxide. Qhov no yog ib qho kev ua haujlwm pyrolytic thiab suav hais tias yog ib qho txheej txheem nyuaj uas ntau yam kev ua haujlwm tshuaj lom neeg tib lub sijhawm tuaj yeem pom. Piv txwv li, dehydrogenation, condensation, hydrogen transfer thiab isomerization. Cov txheej txheem carbonization txawv ntawm cov txheej txheem carbonization vim tias carbonization yog ib qho txheej txheem sai dua vim tias nws ua haujlwm ntau qhov kev txiav txim siab sai dua. Feem ntau, qhov kub ntawm cov cua sov siv tuaj yeem tswj tau qib ntawm carbonization thiab qhov kub ntawm cov khoom txawv teb chaws uas tseem tshuav. Piv txwv li, cov pa roj carbon ntawm cov seem yog li 90% ntawm qhov hnyav ntawm 1200K thiab li 99% ntawm qhov hnyav ntawm li 1600K. Feem ntau, carbonization yog ib qho kev ua haujlwm exothermic, uas tuaj yeem tso rau nws tus kheej lossis siv ua lub zog yam tsis muaj cov pa roj carbon dioxide. Txawm li cas los xij, yog tias cov khoom siv biomaterial raug rau kev hloov pauv sai sai hauv cua sov (xws li hauv kev tawg nuclear), cov khoom siv biomaterial yuav carbonize sai li sai tau thiab dhau los ua cov pa roj carbon khov.
Graphitization zoo ib yam li carbonization
Ob qho tib si yog cov txheej txheem kev lag luam tseem ceeb uas muaj cov pa roj carbon ua cov tshuaj reactant lossis cov khoom.
Qhov txawv ntawm graphitization thiab carbonization yog dab tsi?
Kev ua kom muaj graphitization thiab carbonization yog ob txoj kev lag luam. Qhov sib txawv tseem ceeb ntawm carbonization thiab graphitization yog tias carbonization cuam tshuam nrog kev hloov cov organic matter mus rau carbon, thaum graphitization cuam tshuam nrog kev hloov cov carbon mus rau graphite. Yog li, carbonization yog kev hloov pauv tshuaj lom neeg, thaum graphitization yog kev hloov pauv microstructure.
Lub sijhawm tshaj tawm: Cuaj hlis-29-2021