Cov khoom siv raw: Cov khoom siv raw siv rau cov khoom siv carbon yog dab tsi?
Hauv kev tsim cov pa roj carbon monoxide, cov khoom siv raw feem ntau siv tuaj yeem muab faib ua cov khoom siv roj carbon monoxide thiab cov ntawv khi thiab cov khoom siv impregnating.
Cov khoom siv roj carbon monoxide muaj xws li roj av coke, bituminous coke, metallurgical coke, anthracite, ntuj graphite thiab graphite seem, thiab lwm yam.
Binder thiab impregnating tus neeg sawv cev muaj xws li thee pitch, thee tar, anthracene roj thiab hluavtaws cob, thiab lwm yam.
Tsis tas li ntawd, qee cov khoom siv xws li quartz xuab zeb, metallurgical coke hais thiab coke hmoov kuj tseem siv hauv kev tsim khoom.
Qee cov khoom tshwj xeeb carbon thiab graphite (xws li carbon fiber, activated carbon, pyrolytic carbon thiab pyrolytic graphite, iav carbon) yog tsim los ntawm lwm cov ntaub ntawv tshwj xeeb.
Calcination: Dab tsi yog calcination?Cov ntaub ntawv raw yuav tsum tau calcined?
Cov txheej txheem ntawm kev kho cua sov yog hu ua calcination.
Calcination yog thawj txheej txheem kev kho cua sov hauv kev tsim cov pa roj carbon ntau.Calcination ua rau muaj kev hloov pauv hauv cov qauv thiab lub cev thiab tshuaj lom neeg ntawm txhua yam ntawm cov khoom siv carbonaceous.
Lub coke ua kub ntawm bituminous coke thiab metallurgical coke yog qhov siab (siab tshaj 1000 ° C), uas yog sib npaug rau qhov kub ntawm calcining rauv hauv cov nroj tsuag carbon.Nws tsis tuaj yeem calcinate thiab tsuas yog yuav tsum tau qhuav nrog dej.
Txawm li cas los xij, yog siv cov coke bituminous thiab roj av coke ua ke ua ntej calcining, lawv yuav tsum raug xa mus rau calciner rau calcining ua ke nrog roj av coke.
Ntuj graphite thiab carbon dub tsis xav tau calcination.
Cov txheej txheem extrusion molding feem ntau yog cov txheej txheem yas deformation ntawm muab tshuaj txhuam.
Cov txheej txheem extrusion ntawm paste yog ua nyob rau hauv cov khoom chamber (los yog lub tog raj kheej muab tshuaj txhuam) thiab lub voj arc nozzle.
Qhov kub muab tshuaj nyob rau hauv lub loading chamber yog tsav los ntawm lub rear lub ntsiab plunger.
Cov pa roj hauv cov muab tshuaj yog yuam kom tsis tu ncua tshem tawm, cov tshuaj muab tshuaj yog txuas mus ntxiv thiab cov tshuaj txhuam mus rau pem hauv ntej tib lub sijhawm.
Thaum cov paste txav mus rau hauv lub tog raj kheej ib feem ntawm lub chamber, cov muab tshuaj txhuam tuaj yeem suav tias yog qhov ruaj khov, thiab cov txheej granular yog qhov sib npaug.
Thaum muab tshuaj nkag mus rau hauv ib feem ntawm lub extrusion nozzle nrog arc deformation, muab tshuaj txhuam ze rau ntawm lub qhov ncauj phab ntsa yuav raug kev sib txhuam ntau dua nyob rau hauv ua ntej, cov khoom pib khoov, cov muab tshuaj txhuam sab hauv tsim sib txawv ua ntej ceev, lub puab paste ua ntej hauv ua ntej, uas ua rau cov khoom raws li radial ceev yog tsis sib xws, yog li nyob rau hauv lub extrusion thaiv.
Thaum kawg, cov tshuaj muab tshuaj nkag mus rau hauv cov kab deformation thiab yog extruded.
Roasting yog txheej txheem kev kho cua sov uas cov khoom nyoos compressed yog rhuab ntawm qee tus nqi nyob rau hauv qhov xwm txheej ntawm kev sib cais huab cua hauv qhov nruab nrab tiv thaiv hauv qhov cub.
Nyob rau hauv cov txheej txheem roasting, vim yog tshem tawm ntawm volatiles, lub coking ntawm asphalt tsim ib coke daim phiaj, decomposition thiab polymerization ntawm asphalt, thiab tsim ib tug loj hexagonal carbon nplhaib network, thiab lwm yam, lub resistivity poob ho.Hais txog 10000. x 10-6 raw khoom resistivity Ω "m, tom qab roasting los ntawm 40-50 x 10-6 Ω" m, hu ua zoo conductors.
Tom qab roasting, cov khoom shrinks li ntawm 1% nyob rau hauv lub cheeb, 2% nyob rau hauv ntev thiab 2-3% nyob rau hauv ntim.
Txawm li cas los xij, tom qab roasting cov khoom nyoos, ib feem ntawm cov thee asphalt yog decomposed rau hauv roj thiab khiav, thiab lwm qhov yog coking rau hauv bituminous coke.
Lub ntim ntawm generated bituminous coke yog ntau me dua li ntawm cov thee bitumen.Txawm hais tias nws shrinks me ntsis hauv cov txheej txheem roasting, ntau qhov tsis xwm yeem thiab cov pores me me nrog qhov sib txawv pore loj tseem tsim nyob rau hauv cov khoom.
Piv txwv li, tag nrho cov porosity ntawm cov khoom graphitized feem ntau yog mus txog 25-32%, thiab cov khoom siv carbon feem ntau yog 16-25%.
Lub hav zoov ntawm ib tug loj tus naj npawb ntawm pores yuav inevitably cuam tshuam lub cev thiab tshuaj zog ntawm cov khoom.
Feem ntau hais lus, graphitized cov khoom nrog nce porosity oxidation, nyob rau ib tug kub ntawm oxidation tus nqi yog kuj ua rau muaj kev cuam tshuam, roj thiab kua ntau dua.
Impregnation yog txheej txheem los txo cov porosity, nce qhov ntom, nce lub zog compressive, txo qhov kev tiv thaiv ntawm cov khoom tiav, thiab hloov lub cev thiab tshuaj lom neeg ntawm cov khoom.
Nws lub hom phiaj yog:
(1) Txhim kho cov thermal thiab hluav taws xob conductivity ntawm cov khoom.
(2) Txhawm rau txhim kho lub tshav kub poob siab thiab tshuaj lom neeg ruaj khov ntawm cov khoom.
(3) Txhim kho lubricity thiab hnav tsis kam ntawm cov khoom.
(4) Tshem tawm impurities thiab txhim kho cov khoom muaj zog.
Cov khoom siv carbon compressed nrog qee qhov loj thiab cov duab muaj qhov sib txawv ntawm deformation thiab kev sib tsoo puas tsuaj thaum ci thiab graphitization.Nyob rau tib lub sij hawm, ib co fillers yog bonded rau saum npoo ntawm compressed carbon cov khoom.
Nws tsis tuaj yeem siv yam tsis muaj kev siv tshuab, yog li cov khoom yuav tsum tau zoo li tus thiab ua tiav rau hauv cov duab geometric.
(2) Qhov xav tau rau kev siv
Raws li tus neeg siv yuav tsum tau ua.
Yog hais tias lub graphite electrode ntawm hluav taws xob rauv steelmaking xav tau kev cob cog rua, nws yuav tsum tau ua nyob rau hauv threaded qhov ntawm ob kawg ntawm cov khoom, thiab ces ob lub electrodes yuav tsum tau txuas nrog rau kev siv tshwj xeeb threaded sib koom.
(3) Cov kev cai siv tshuab
Qee cov khoom yuav tsum tau ua tiav rau hauv cov duab tshwj xeeb thiab cov kev qhia tshwj xeeb raws li kev xav tau ntawm cov neeg siv khoom.
Txawm tias qhov qis ntawm qhov roughness yuav tsum tau.
Post lub sij hawm: Dec-10-2020