Ua lag ua luamKev lag luam

Graphite: Melting kub, khoom thiab cov kev siv

Graphite yog hais txog cov zaub mov uas txawv versatility nyob rau hauv kev siv tswv yim. Nws yog txoj kev cai uas nyob qib qub nrog cov coloring teeb meem, tab sis qhov no yog tsis yog tas rau nws muaj peev xwm. Nyob rau tib lub sij hawm ib tug tsis txawj hais lus ntawm lub universality ntawm kev siv ntawm cov khoom no, vim hais tias ntawm nws cov fawm kib qauv thiab kuj txiav txim seb tus uas duav txhua yam ntawm daim ntawv thov. Tsis hais qhov yuav tsum tau rau tshwj xeeb ua tej yam kev mob. Lub fact tias cov melting point ntawm graphite nyob rau hauv degrees Celsius yuav ncav cuag 2800 ° C, uas yuav tsum tau kev koom tes ntawm tshwj xeeb cov chaw rau qhov siv thiab ua zaum kawg khoom.

thaj chaw ntawm graphite

Ntawm cov yooj yim ua tau zoo cov yam ntxwv ntawm cov mineral zoo tu qab tso thermal conductivity, muaj peev xwm ua raws li ib tug neeg xyuas pib ntawm hluav taws xob tam sim no thiab cov softness ntawm cov qauv, uas, li cas los xij, yog tsis ib txwm ib tug ntxiv graphite cov khoom. Nrog rau kev hwm mus thermal conductivity, tej zaum nws yuav mus txog 2400 W / (m * K) los yog ntau tshaj. Qhov no tus nqi nyob rau cov qauv thiab cov kev ceev cov ntaub ntawv. Ceeb tshaj, lub graphite, lub melting kub twb varied nyob rau hauv lub chav 2500 - 3000 ° C, nws yuav softer qauv. Qhov no yuav ua tau ib qho kev zoo rau ntxiv qhia tawm ntawm mineral thaj chaw ntawm hlau, tab sis lub tshav kub kev kho mob dramatically txo cov kev dag lub zog yam ntxwv. Raws li ib tug tshwm sim, graphite yuav ua tau raws li zoo li lub hlau nyob rau hauv lub qhov hluav taws xob, tab sis vim hais tias ntawm lub fragility yuav tsis zoo nyob rau hauv ib tug heev los ntawm txhais tes lag luam.

mineral kuj sib txawv reactivity nyob rau hauv kev sib cuag nrog reactive tshuaj, xws li ntsev thiab alkali hlau. Txawm li cas los, qhov no yog nyob rau hauv lub tej yam kev mob nyob rau hauv uas yog graphite. Lub melting point ntawm txog 2800 ° C (uas tus mineral yog reacted nrog rau oxygen) tej zaum yuav raug nyob rau hauv combustion rau carbon dioxide tsim.

melting point

Lub spectrum ntawm kub uas melting tej zaum yuav tau graphite yog heev ntau haiv neeg. Ntau nyob, piv txwv li, los ntawm qhov kawg cov hom phiaj ntawm lub lag luam. Kub kuj txiav txim cov ib puag ncig tej yam kev mob thiab cov yam ntxwv ntawm ib tug mineral, thiab thov tshav kub kev kho mob thaum lub sij hawm ntxiv txhais tau tias ntawm influencing graphite. Lub melting kub uas yog tau mus nrhiav tau ib tug npaj txhij rau siv graphite, yog hom twg los ntawm 2600 mus 3800 ° C. Tsis tas li ntawd xyaum muab xam Kelvin. Nyob rau hauv cov ntaub ntawv no, nws twb nce mus txog 4000 ° K, tab sis qhov no tus nqi yuav tau nce nyob rau hauv lub siab qhia. Feem ntau, lub melting ntawm graphite ua nyob rau hauv siab 105 - 130 bar.

ib kub npau npau taw tes

Qhov yuav tsum tau rau thaum tshav kub kub kev kho mob yog vim hais tias cov lag luam nrhiav kev los hloov qhov kev kawm ntawm cov ntaub ntawv uas nyob rau hauv thiaj li yuav tsim tau zoo dua cov khoom. Tsawg zaus siv txoj kev nqa rau ib tug boil lub mineral, tab sis lawv tso cai rau koj los mus txhim kho tej yam khoom ntawm lub tsev. Cov nqe lus nug ntawm yog dab tsi lub melting kub thiab cov kub kub ntawm graphite feem ntau yuav qhia kom meej rau tib ntau yam - los ntawm 3800 mus 4200 ° C. Lub sab Harbor lub sij lub xeev ntawm melting, thiab lub Upper - boiling khoom. Ib zaug ntxiv, nyob ntawm seb cov yam ntxwv ntawm graphite thiab nws cov variants tej yam kev mob ntawm thermal feem nyob rau hauv muab cov kev kawm lub xeev ntawm cov mineral - kub los yog melting point - yuav sib.

tau txais technology

Zoo tag nrho cov ntawm graphite khoom mus xaus-siv no yuav ua hauj lwm. Ib tug qauv rau kev ua ib tug graphite thiab txiav txim seb lub hom ntawm cov khoom. Feem ntau, nyob rau hauv txoj kev ntawm qhov txawv yog tshwm sim los ntawm cia li tus ntawm kub. Yog li, los ntawm cua sov rau cov sib tov ntawm lub suab coke thiab graphite tau achesonovsky. melting thiab boiling kub nyob rau hauv cov ntaub ntawv no yuav 2800 thiab 4200 ° C feem. Thermomechanical ua cov txheej txheem coke sib tov muab raug nrog tib tsis cua kub - qhov txawv lus dag nyob rau hauv txoj kev siv cov carbide-txoj kev Cheebtsam. Uas tsis muaj nqi thaum tshav kub kub kev kho mob yog sib txawv pyrolysis txoj kev. Nyob rau hauv cov ntaub ntawv no, tej yam ntuj tso graphite yog hloov los ntawm gaseous hydrocarbons nyob rau hauv lub tshuab nqus tsev ntawm 1500 ° C. Nyob rau hauv no faib txias thiab ua txoj kev rau cov puag mixtures graphite. Cov yees xws li cov sau, nyob rau hauv uas lub qeeb txias by luj hlau.

Kev siv ntawm graphite

graphite zog, raws li twb tau sau tseg, tau tso cai rau nws mus nrhiav tau ntau daim ntawv thov nyob rau hauv ntau yam teb. Nws yog siv nyob rau hauv qhov siv thiab ua electrodes, cwj mem qhuav, safeners, siv xab cov ntaub ntawv thiab txawm raws li ib tug roj nplua nyeem. Thermal zoo mineral txiav txim nws usefulness raws li ib feem ntawm lub cub tawg lug. Piv txwv li, lub graphite hauv ob sab phlu daim hlau thiab ua crucibles. Tab sis ntau npaum nyob rau cov hom, uas pib graphite. Lub melting point ntawm ib co hom ntawm cov khoom yog 2600 ° C, piv txwv li, tso cai rau lawv siv nyob rau hauv industrial thermal ua lag. Tab sis electrochemical zoo tso cai rau cov kev siv ntawm cov feem ntau ntawm cov khoom los ntawm graphite li tus neeg xyuas pib hais ntawm infrastructure.

xaus

Graphite ntaub ntawv yuav tsum tau saib raws li ib tug saj zawg zog moj khaum rau kev siv nyob rau hauv ntau yam industries. Zoo hluav taws xob thiab thermal conductivity, tab sis yog sab by sab nrog cev fragility thiab coj tus nqi ntawm cov neeg kho tshuab cia siab rau, tab sis ib tug zoo lub sij hawm rau hauv daim ntawv thov ntawm mas tshwj xeeb mineral. Los ntawm lub standpoint ntawm industrial ua qauv, graphite melting kub nyob rau hauv degrees, uas yog ib tug nruab nrab ntawm 2800 ° C, yog tsis tseem ceeb heev. Npaj rau lub melting txheej txheem los yog boiling ntawm cov ntaub ntawv uas them tsis taus txawm ib tug me me enterprise koom nyob rau hauv qhov siv thiab ua electrochemical qhov cuab lub zog. Ib qho ntxiv uas yog hais tias lub zus tau tej cov kawg khoom ua los ntawm graphite yuav tsum tau tsis tsuas tshav kub kev kho mob.

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