1.4 Secondary sib tsoo
Cov muab tshuaj txhuam yog crushed, hauv av, thiab sieved mus rau hauv ib feem ntawm kaum mus rau pua pua ntawm micrometers loj ua ntej muab sib tov sib npaug.Nws yog siv los ua cov khoom nias, hu ua pressing hmoov.Cov khoom siv rau kev sib tsoo thib ob feem ntau yog siv lub tshuab ntsug ntsug lossis pob zeb.
1.5 Tsim
Tsis zoo li qub extrusion thiab molding,isostatic nias graphiteyog tsim los siv cov tshuab txias isostatic nias (Daim duab 2).Sau cov khoom siv raw hmoov rau hauv cov pwm roj hmab, thiab ua kom cov hmoov sib tov los ntawm kev siv hluav taws xob ntau zaus.Tom qab sealing, nqus cov hmoov hmoov kom tso pa tawm ntawm lawv.Muab tso rau hauv lub thawv uas muaj cov kua dej xws li dej los yog roj, nias nws mus rau 100-200MPa, thiab nias rau hauv cov khoom cylindrical lossis duab plaub.
Raws li Pascal lub hauv paus ntsiab lus, lub siab yog siv rau cov pwm roj hmab los ntawm cov kua nruab nrab xws li dej, thiab lub siab sib npaug ntawm txhua qhov kev qhia.Nyob rau hauv no txoj kev, cov hmoov hais tsis yog taw qhia nyob rau hauv lub filling kev taw qhia nyob rau hauv lub pwm, tab sis yog compressed nyob rau hauv ib tug tsis tu ncua kev npaj.Yog li ntawd, txawm hais tias graphite yog anisotropic nyob rau hauv crystallographic zog, tag nrho, lub isostatic nias graphite yog isotropic.Cov khoom tsim tsis tsuas yog muaj cylindrical thiab rectangular duab, tab sis kuj cylindrical thiab crucible duab.
Lub isostatic nias molding tshuab yog tsuas yog siv nyob rau hauv cov hmoov metallurgy kev lag luam.Vim qhov kev thov ntawm high-end kev lag luam xws li aerospace, nuclear kev lag luam, nyuaj alloys, thiab high-voltage electromagnetic, txoj kev loj hlob ntawm isostatic pressing tshuab yog ceev heev, thiab nws muaj peev xwm los tsim txias isostatic pressing tshuab nrog ib tug ua hauj lwm lub tog raj kheej. puab txoj kab uas hla ntawm 3000mm, qhov siab ntawm 5000mm, thiab siab tshaj plaws ua hauj lwm siab ntawm 600MPa.Tam sim no, lub siab tshaj plaws specifications ntawm txias isostatic nias tshuab siv nyob rau hauv cov pa roj carbon kev lag luam rau tsim isostatic nias graphite yog Φ 2150mm × 4700mm, nrog ib tug siab tshaj plaws ua hauj lwm siab ntawm 180MPa.
1.6 Kev
Thaum lub sij hawm roasting txheej txheem, ib tug complex tshuaj cov tshuaj tiv thaiv tshwm sim ntawm lub aggregate thiab cov binder, ua rau lub binder decompose thiab tso tawm ib tug loj npaum li cas ntawm volatile teeb meem, thaum tseem muaj ib tug condensation cov tshuaj tiv thaiv.Nyob rau hauv qhov qis-kub preheating theem, cov khoom nyoos nthuav dav vim cua sov, thiab tom qab cua sov txheej txheem, lub ntim shrinks vim condensation cov tshuaj tiv thaiv.
Qhov loj dua qhov ntim ntawm cov khoom nyoos, qhov nyuaj dua yog tso tawm cov teeb meem tsis haum, thiab qhov chaw thiab sab hauv ntawm cov khoom nyoos yog qhov sib txawv ntawm qhov kub thiab txias, tsis sib xws thermal expansion thiab contraction, uas yuav ua rau tawg ntawm cov khoom nyoos.
Vim nws cov qauv zoo, isostatic pressing graphite yuav tsum muaj cov txheej txheem roasting qeeb tshwj xeeb, thiab qhov kub hauv lub cub tawg yuav tsum zoo ib yam, tshwj xeeb tshaj yog thaum lub sij hawm kub kub uas asphalt volatiles tawm sai sai.Cov txheej txheem cua sov yuav tsum tau ua nrog ceev faj, nrog rau qhov cua sov tsis tshaj 1 ℃ / h thiab qhov kub sib txawv hauv qhov cub kub tsawg dua 20 ℃.Cov txheej txheem no yuav siv sijhawm li 1-2 lub hlis.
1.7 Impregnation kev
Thaum lub sij hawm roasting, cov teeb meem volatile ntawm thee tar suab yog tawm.Cov pores zoo nyob rau hauv cov khoom thaum lub sij hawm tso pa tawm thiab ntim contraction, yuav luag tag nrho cov uas yog qhib pores.
Txhawm rau txhim kho lub ntim ntom ntom, lub zog siv, thermal imporivity txoj kev siv tau, thiab cov tshuaj lom neeg impralic thee rau sab hauv ntawm cov khoom lag luam los ntawm cov khoom qhib.
Cov khoom yuav tsum tau preheated ua ntej, thiab ces nqus thiab degassed nyob rau hauv lub impregnation tank.Tom qab ntawd, lub melted thee tar asphalt yog ntxiv rau lub impregnation tank thiab nias kom tso cai rau impregnating tus neeg sawv cev asphalt nkag mus rau sab hauv ntawm cov khoom.Feem ntau, isostatic pressing graphite undergoes ntau lub voj voog ntawm impregnation roasting.
1.8 Graphitization ua haujlwm
Tshav kub cov khoom calcined txog li 3000 ℃, npaj cov lattice ntawm carbon atoms kom zoo, thiab ua kom tiav cov transformation ntawm carbon rau graphite, uas yog hu ua graphitization.
Cov txheej txheem graphitization muaj xws li Acheson txoj kev, kev sib txuas hauv thermal series, high-frequency induction method, thiab lwm yam. Cov txheej txheem Acheson ib txwm siv li ntawm 1-1.5 lub hlis rau cov khoom thauj khoom thiab tawm ntawm qhov cub.Txhua lub cub tawg tuaj yeem tuav tau ntau tons rau ntau ntau tons ntawm cov khoom ci.
Post lub sij hawm: Sep-29-2023