Vim li cas graphite electrodes tuaj yeem tiv taus qhov kub thiab txias?

Vim li cas graphite electrodes tuaj yeem tiv taus qhov kub thiab txias?

Graphite electrodes ua lub luag haujlwm tseem ceeb hauv kev lag luam niaj hnub no, tshwj xeeb tshaj yog nyob rau hauv kev siv hauv qhov chaw kub kub, xws li hluav taws xob arc rauv steelmaking, aluminium electrolysis, thiab electrochemical ua. Yog vim li cas vim li cas graphite electrodes tuaj yeem tiv taus qhov kub thiab txias ib puag ncig feem ntau yog vim lawv lub cev thiab tshuaj lom neeg. Tsab ntawv xov xwm no yuav tshawb txog qhov kev ua tau zoo ntawm graphite electrodes nyob rau hauv qhov kub thiab txias ib puag ncig xws li cov qauv, thermal zog, tshuaj stability, thiab mechanical zog ntawm graphite.

1. Cov yam ntxwv ntawm graphite

Graphite yog cov khoom siv txheej txheej txheej tsim los ntawm carbon atoms. Nyob rau hauv cov qauv siv lead ua ntawm graphite, carbon atoms yog teem rau hauv ib hexagonal planar txheej. Cov pa roj carbon atoms nyob rau hauv txhua txheej yog txuas nrog lub zog covalent bonds, thaum cov khaubncaws sab nraud povtseg cuam tshuam nrog ib leeg los ntawm cov tsis muaj zog van der Waals rog. Cov txheej txheem txheej no endows graphite nrog lub cev thiab tshuaj lom neeg tshwj xeeb.

Muaj zog covalent bonds nyob rau hauv cov khaubncaws sab nraud povtseg: Covalent bonds ntawm carbon atoms nyob rau hauv cov khaubncaws sab nraud povtseg muaj zog heev, enabling graphite kom muaj kev ruaj ntseg yam ntxwv txawm nyob rau hauv high kub.

Tsis muaj zog van der Waals quab yuam ntawm cov khaubncaws sab nraud povtseg: Kev sib cuam tshuam ntawm cov khaubncaws sab nraud povtseg yog qhov tsis muaj zog, uas ua rau cov graphite muaj feem cuam tshuam rau interlayer zawv zawg thaum raug rau sab nraud quab yuam. Cov yam ntxwv no endows graphite nrog zoo lubrication thiab processability.

2. Cov khoom cua sov

Qhov kev ua tau zoo ntawm graphite electrodes nyob rau hauv qhov kub thiab txias ib puag ncig feem ntau yog los ntawm lawv cov khoom thermal zoo.

Cov ntsiab lus melting siab: Graphite muaj qhov siab tshaj plaws melting point, kwv yees li 3,652 ° C, uas yog siab dua li ntawm cov hlau thiab alloys feem ntau. Qhov no ua rau graphite nyob twj ywm ntawm qhov kub thiab txias yam tsis muaj melting lossis deforming.

High thermal conductivity: Graphite muaj cov thermal conductivity siab, uas tuaj yeem ua tau sai thiab tawg cua sov, tiv thaiv cov cua sov hauv zos. Cov yam ntxwv no ua rau cov graphite electrode kom sib npaug faib cov cua sov hauv qhov chaw kub kub, txo cov thermal kev nyuab siab thiab ua kom ntev kev pab cuam lub neej.

Tsawg coefficient ntawm thermal expansion: Graphite muaj qhov coefficient tsawg ntawm thermal expansion, uas txhais tau hais tias nws ntim hloov tsawg dua ntawm qhov kub thiab txias. Cov yam ntxwv no ua rau graphite electrodes kom muaj qhov ruaj khov nyob rau hauv qhov chaw kub kub, txo kev ntxhov siab tawg thiab deformation los ntawm thermal expansion.

3. Tshuaj stability

Cov tshuaj stability ntawm graphite electrodes nyob rau hauv high-temperature ib puag ncig kuj yog ib qho tseem ceeb rau lawv tiv taus kub.

Oxidation kuj: Thaum qhov kub thiab txias, cov tshuaj tiv thaiv tus nqi ntawm graphite nrog oxygen kuj qeeb, tshwj xeeb tshaj yog nyob rau hauv inert gases los yog txo cov cua, qhov twg oxidation tus nqi ntawm graphite yog txawm qis dua. Qhov kev tiv thaiv oxidation no ua rau graphite electrodes siv tau ntev hauv qhov chaw kub kub tsis tau oxidized thiab hnav tawm.

Corrosion kuj: Graphite muaj corrosion kuj zoo rau feem ntau acids, alkalis thiab ntsev, uas ua rau graphite electrodes nyob ruaj khov nyob rau hauv high-kub thiab corrosive ib puag ncig. Piv txwv li, thaum lub sij hawm electrolytic txheej txheem ntawm txhuas, graphite electrodes tuaj yeem tiv taus corrosion ntawm molten aluminium thiab fluoride ntsev.

4. Mechanical zog

Txawm hais tias interlaminar kev sib cuam tshuam ntawm graphite yog qhov tsis muaj zog, cov khoom muaj zog covalent nyob rau hauv nws cov qauv intramellar endow graphite nrog lub zog txhua yam.

Lub zog compressive siab: Graphite electrodes tuaj yeem tswj tau lub zog siab compressive txawm nyob rau hauv qhov kub thiab txias, muaj peev xwm tiv taus siab thiab cuam tshuam cov loads hauv hluav taws xob arc furnaces.

Cov thermal shock kuj zoo heev: Qhov qis coefficient ntawm thermal expansion thiab high thermal conductivity ntawm graphite endow nws nrog zoo heev thermal poob siab kuj, ua rau nws tswj cov txheej txheem kev ncaj ncees thaum lub sij hawm ceev cua kub thiab txias txheej txheem thiab txo cov cracking thiab puas los ntawm thermal stress.

5. Cov khoom siv hluav taws xob

Kev ua haujlwm hluav taws xob ntawm graphite electrodes nyob rau hauv qhov chaw kub kub kuj yog qhov laj thawj tseem ceeb rau lawv daim ntawv thov dav.

High hluav taws xob conductivity: Graphite muaj cov khoom siv hluav taws xob zoo heev, uas tuaj yeem ua tau zoo tam sim no thiab txo lub zog poob. Cov yam ntxwv no ua rau graphite electrodes hloov hluav taws xob zoo hauv hluav taws xob arc rauv thiab cov txheej txheem electrolysis.

Tsawg resistivity: Qhov tsis tshua muaj siab ntawm graphite ua rau nws muaj kev tiv thaiv qis ntawm qhov kub thiab txias, txo cov hluav taws kub thiab hluav taws xob poob, thiab txhim kho kev siv hluav taws xob.

6. Kev ua haujlwm zoo

Kev ua tau zoo ntawm graphite electrodes kuj yog ib qho tseem ceeb rau lawv daim ntawv thov nyob rau hauv high-temperature ib puag ncig.

Cov txheej txheem yooj yim: Graphite muaj kev ua tau zoo heev thiab tuaj yeem ua tiav rau hauv electrodes ntawm ntau cov duab thiab qhov ntau thiab tsawg los ntawm kev ua tshuab, tig, milling thiab lwm yam txuj ci kom tau raws li qhov xav tau ntawm cov ntawv thov sib txawv.

High purity: High-purity graphite electrodes muaj kev ruaj ntseg zoo dua thiab kev ua tau zoo nyob rau hauv qhov chaw kub kub, uas tuaj yeem txo cov tshuaj tiv thaiv thiab cov qauv kev puas tsuaj los ntawm impurities.

7. Piv txwv daim ntawv thov

Graphite electrodes yog dav siv nyob rau hauv ntau yam high-temperature industrial teb. Cov hauv qab no yog qee qhov piv txwv ntawm daim ntawv thov:

Hluav taws xob arc rauv steelmaking: Nyob rau hauv cov txheej txheem hluav taws xob arc rauv steelmaking, graphite electrodes, ua cov khoom siv hluav taws xob, tuaj yeem tiv taus qhov kub thiab txias li 3000 ° C, hloov hluav taws xob rau hauv thermal zog kom yaj cov hlau thiab npua hlau.

Electrolytic aluminium: Thaum lub sij hawm electrolytic txhuas txheej txheem, graphite electrode ua lub anode, muaj peev xwm tiv taus qhov kub thiab txias thiab corrosion ntawm molten aluminium thiab fluoride ntsev, stably ua tam sim no, thiab txhawb cov electrolytic ntau lawm ntawm txhuas.

Electrochemical machining: Hauv electrochemical machining, graphite electrodes, raws li cov cuab yeej electrodes, tuaj yeem ua haujlwm ruaj khov hauv qhov chaw kub thiab corrosive, ua tiav high-precision ua thiab tsim.

Xaus

Hauv kev xaus, vim li cas vim li cas graphite electrodes tuaj yeem tiv taus qhov kub thiab txias ib puag ncig feem ntau yog nyob rau hauv lawv cov txheej txheem tshwj xeeb, cov khoom siv thermal zoo, tshuaj lom neeg ruaj khov, txhua yam muaj zog, hluav taws xob thiab kev ua haujlwm. Cov yam ntxwv no ua rau graphite electrodes nyob ruaj khov thiab ua haujlwm zoo hauv qhov chaw kub thiab corrosive, thiab lawv tau siv dav hauv cov teb xws li hluav taws xob arc rauv steelmaking, electrolytic aluminium, thiab electrochemical ua. Nrog rau kev txhim kho txuas ntxiv ntawm kev lag luam thev naus laus zis, kev ua haujlwm thiab daim ntawv thov ntawm graphite electrodes yuav raug nthuav dav ntxiv, muab cov kev daws teeb meem zoo dua thiab muaj txiaj ntsig zoo rau kev lag luam kub.