Graphite electrodes yog tsim los ntawm roj av-raws li coke thiab thee tar pitch los ntawm cov saw hlau ntawm kev tsim, thermal thiab machining cov kauj ruam. Qhov sib lawv liag hloov lub nkig, tsis tshua muaj - conductivity ntsuab lub cev mus rau hauv lub crystalline graphite lub tog raj kheej uas nqa tam sim no mus rau hauv ib tug hluav taws xob arc rauv ntawm tam sim no ntom uas muaj peev xwm tshaj 30 A / cm2. Txhua theem hloov ntau qhov ntom ntom, porosity thiab coefficient ntawm thermal expansion, thiab peb lub zog txiav txim siab seb cov electrode coj li cas ntawm lub ru tsev.
Raw Khoom Xaiv: Coke thiab Binder
Petroleum coke yog lub hauv paus aggregate. Lub hwj chim tsis tu ncua (RP) thiab lub zog siab (HP) electrodes feem ntau yog tsim los ntawm daim txhuam cev coke, thaum ultra- siab zog (UHP) qib xav tau koob coke nrog lub zog anisotropic, rab koob - zoo li cov qauv nplej, tsis muaj leej faj thiab cov tshauv tsawg. Coal tar pitch yog lub binder; tom qab carbonization nws dhau los ua ib feem ntawm cov khoom carbon matrix es tsis tshuav ib ntus cais. Sulfur nyob rau hauv calcined coke yog txiav txim los ntawm ASTM D4239 thiab volatile teeb meem los ntawm ASTM D3175, vim hais tias leej faj drives puffing thiab cracking thaum lub sij hawm graphitization thiab tshauv - ua minerals nce resistivity. Calcined coke yog crushed, milled thiab ces muab faib mus rau hauv kev tswj cov feem me me kom lub cev tiav mus txog lub hom phiaj ceev.
Graphitization
Graphitization yog kauj ruam uas txhais cov khoom. Ci lub cev muaj zog tiv taus-kub rau 2500-3000 C hauv Acheson rauv lossis lub qhov cub hluav taws xob ntev ntev. Nyob rau hauv lub qhov rais kub no lub turbostratic carbon rearranges rau hauv ib txheej graphite siv lead ua lattice. Hluav taws xob resistivity poob sharply, thermal conductivity nce, thiab cov khoom ua siab ntev ntawm thermal shock. Graphitization siv qhov loj tshaj plaws ntawm cov hluav taws xob hluav taws xob siv nyob rau hauv tag nrho cov txheej txheem.
Kev xaiv thiab muab kev txiav txim siab
Cov neeg yuav khoom sib piv cov khoom siv rau cov khoom no yuav tsum nug rau daim ntawv pov thawj zeb xeem uas nrog cov khoom xa tuaj thiab xyuas tias cov cua sov ntawm daim ntawv pov thawj sib tw rau cov cim ntawm cov khoom. Daim ntawv pov thawj qhov tseem ceeb yog cov pov thawj tswj kev ua raws cai; daim ntawv qhia cov ntaub ntawv tsuas yog qhia.
Kev kam rau siab, qhov chaw, qhov kub thiab txias -txoj kev kho mob thiab cov txheej txheem ntim khoom yuav tsum tau sau rau hauv daim ntawv xaj yuav tsum tsis yog qhov kev pom zoo, vim tias cov ntsiab lus no txiav txim siab seb cov khoom puas tuaj yeem ua tiav yam tsis muaj kev rov ua dua tom qab tuaj txog. Rau kev xa khoom xa tuaj, lees paub qhov kev soj ntsuam xyuas, qhov lees txais thib peb -tus neeg soj ntsuam thiab cov ntaub ntawv teev tseg uas yuav tsum tau ua rau kev lis kev cai ua ntej qhov kev txiav txim raug tso tawm rau kev tsim khoom.
Cov lus nug nquag
Q:Dab tsi yog cov khoom siv tseem ceeb ntawm graphite electrode?
A: Petroleum coke, feem ntau yog koob coke rau qib UHP, sib koom nrog cov thee tar suab. Lub coke muab cov pob txha pob txha thiab lub suab ua raws li cov ntaub ntawv uas carbonizes thaum ci.
Q:Vim li cas graphitization ua tiav ntawm 2500-3000 C?
A: Tsuas yog nyob rau hauv qhov kub thiab txias ua rau cov pa roj carbon tsis zoo hloov mus rau hauv txheej txheej graphite siv lead ua lattice. Lub transformation sharply txo hluav taws xob resistivity thiab nce thermal shock kuj.
Q:Dab tsi yog impregnation siv rau?
A: Pitch lossis resin raug yuam kom qhib qhov pores tom qab ci thiab tom qab ntawd rov ua dua - ci, uas ua kom pom tseeb ntom ntom thiab lub zog txhua yam, feem ntau yog rau qib siab electrodes.
Q:Lub voj voog ntau lawm ntev npaum li cas?
A: Nws yog ntsuas hauv lub lis piam. Ci ib leeg tuaj yeem tuav tau ob peb lub lis piam suav nrog kev tswj kom txias, thiab graphitization ntxiv rau qhov cub ntxiv ua ntej machining thiab kuaj.
Q:Cov kev ntsuam xyuas twg yog khiav ua ntej xa hluav taws xob?
A: Bulk density, electrical resistivity, flexural strength, apparent porosity and ash content, using methods such as ASTM C559, ASTM C611, ASTM C651, ASTM C1025 and ASTM C1039, with results recorded on the mill test certificate.