Isotropic Graphite yog dab tsi?

Yog tias koj tau tshawb nrhiav"Isotropic graphite yog dab tsi?", tej zaum koj yuav tsis nrhiav phau ntawv txhais. Koj tab tom sim txiav txim siab seb cov ntaub ntawv no puas tsim nyog rau ib feem tiag -ibEDM hluav taws xob, a high -kub fixture, ib tug semiconductorrauv tivthaiv, lossis ib daim ntawv thov uas qhov kev ua tau zoo tshaj plaws.

Isotropic graphiteyog ib tug engineeredgraphite khoomtsim kom muajnyob ze -cov khoom sib xws hauv txhua qhov kev qhia(X/Y/Z). Hauv kev xyaum, qhov ntawd txhais tau hais tias muaj zog txhua yam zoo sib xws, kev coj tus cwj pwm thermal, thiab kev ua haujlwm tau zoo dua li kev coj ua zoo tshaj - nyob ntawm qib graphite.

Hauv phau ntawv qhia no, peb yuav piav qhia:

1. isotropic graphite yog dab tsi (hauv cov ntsiab lus engineering),
2. Txawm hais tias graphite yog isotropic lossis anisotropic, thiab yog vim li cas lo lus nug no nyuaj,
3. Dab tsi yog isostatic graphitethiab nws cuam tshuam li cas rau isotropic graphite,
4. cov khoom tseem ceeb uas koj yuav tsum sib piv,
5. Cov ntawv thov sib xws-thiab daim ntawv txheeb xyuas RFQ yooj yim los pab koj txheeb xyuas qib raug.

Nco tseg: "Isotropic" yog ibvaj tse(yuav ua li cas cov khoom coj). "Isostatic" yog ibtxheej txheem(cov khoom siv li cas). Tib neeg sib xyaw cov no tas li -yog li peb yuav ua kom pom tseeb.

Cov lus teb luv luv:graphite tuaj yeem yog ib qho, nyob ntawmkoj txhais li cas ntawm graphite.

Nyob rau theem siv lead ua, graphite muaj txheej txheej txheej. Cov txheej no nyiam ua graphiteanisotropic(kev taw qhia-dependent), vim hais tias cov khoom raws cov txheej txheem sib txawv ntawm cov khoom thoob plaws lawv.

Tab sis kev lag luam graphite tsis yog ib qho siv lead ua - feem ntau nws yog ib qhopolycrystalline, ntxeem tau, engineered khoom. Nwsmacroscopictus cwj pwm nyob ntawm ntau yam ntawm:

• raw cov ntaub ntawv (coke hom, binder, additives),
• grain loj thiab faib,
• porosity thiab pore orientation,
• txoj kev tsim (extrusion, molding, isostatic nias),
• impregnation thiab cua sov- cov kauj ruam kho.

Yog li thaum ib tug neeg nug, "Puas yog graphite isotropic lossis anisotropic?" lo lus teb tiag tiag yog:

• Ntau cov graphite extruded yog pom zoo anisotropic(vim txoj kev taw qhia tsim kev ntxhib los mos thiab ua raws porosity).
• Ntau cov pwm graphites tsawg dua anisotropic(tab sis tej zaum tseem yuav muaj cov kev taw qhia nyiam nyob ntawm tus txheej txheem).
• Ntauisostatically nias graphitesnyob ze rau isotropic, vim hais tias siab yog siv uniformly, txo cov kev taw qhia zoo nkauj.

Tias yog vim li cas "isotropic graphite khoom" feem ntau siv hauv engineering ntsiab lus: nws qhia koj xav tau graphite nrogruaj khov, kev taw qhia- ua tau zoo ib yam, tsis yog "txhua yam graphite tshwm sim muaj."

Isotropic graphiteyog cov khoom siv graphite engineered kom nws cov khoom tseem ceeb sib xws li ua tau nyob rau hauv tag nrho cov lus qhia. Hauv cov ntsiab lus siv tau, isotropic graphite lub hom phiaj txo qis qhov kev ua tau zoo sib txawv uas koj xav pom ntawm axial thiab radial cov lus qhia hauv cov graphite blocks.

Dab tsi "isotropic" feem ntau txhais tau tias hauv cov haujlwm tiag tiag

Thaum qib graphite tiag tiag ze rau isotropic, koj tuaj yeem tau txais txiaj ntsig zoo li:

• Xav paub ntau ntxiv machining(tsawg "xav tsis thoob" chipping lossis ntug tawg hauv ib qho kev taw qhia)
• Muaj zog sib xwshla ib feem
• Txo qhov kev pheej hmoo ntawm distortionthaum cov khoom cua sov los yog txias
• Ntau yam hnav / yaignyob rau hauv electrodes los yog thermal Cheebtsam
• Zoo dua repeatabilitythaum koj ntsuas los ntawm tus qauv mus rau ntau lawm

Nws yog qhov tseem ceeb tshwj xeeb tshaj yog thaum koj qhov geometry muaj cov yam ntxwv hauv ntau cov lus qhia (cov phab ntsa nyias, cov qhov, tav, cov hnab tshos sib sib zog nqus), lossis thaum thermal gradients tsis tuaj yeem zam.

Koj tsis "ntxiv" isotropy zoo li cov khoom xyaw. Kojua tiavnws los ntawm kev tswj cov microstructure yog li cov khoom muaj tsawg tsawg nyiam orientation.

Cov koom haum tseem ceeb suav nrog:

1) Kev tsim qauv thiab kev tswj kev ntxhib los mos

Tus tsav tsheb loj tshaj plaws yog li cas lub cev ntsuab tsim:

Extrusionnyiam mus dlhos hais thiab pores → ntau anisotropy

Pa moldingtuaj yeem sib npaug ntau dua, tab sis tseem tuaj yeem qhia kev taw qhia

Isostatic niassiv siab uniformly → feem ntau tsim cov qauv zoo tshaj plaws

2) Cov qoob loo loj thiab kev faib tawm

Finer thiab ntau sib npaug ntawm cov nplej feem ntau txhawb nqa:

smoother machining,

nruj tolerances,

txhim kho mechanical uniformity (nyob ntawm qib).

3) Porosity thiab pore orientation

Graphite yog inherently ntxeem tau. Qhov tseem ceeb yog:

seb pores puas sib npaug,

seb qhov pores tau ua raws (kev taw qhia) lossis random (ntau isotropic),

seb impregnation yog siv los kho qhov ntom ntom thiab txo qhov qhib porosity.

4) Kev kho cua sov thiab graphitisation

High -kev kho kub (graphitisation) txiav txim siab:

crystallinity kawg,

thermal cwj pwm,

stability nyob rau hauv siab kub.

5) Purity tswj (rau siab - siv kawg)

Rau kev siv xws li semiconductor thermal teb, "isotropic" ib leeg tsis txaus. Koj tseem yuav txhawj txog:

hmoov tshauv / metallic impurities,

kev sib haum xeeb nyob rau hauv batch,

traceability thiab soj ntsuam cov ntaub ntawv.

Yog li ntawd,isotropic graphite yog dab tsi?Hauv cov ntsiab lus siv tau, nws yog cov khoom siv graphite tsim los xanyob ze -kev ua tau zoo nyob hauv txhua qhov kev taw qhia, pab cov engineers ua tiav kev ua haujlwm tau zoo dua qub, muaj zog zoo ib yam, thiab ruaj khov thermal tus cwj pwm hauv qhov xav tau ib puag ncig. Qhov tseem ceeb ntawm kev tshem tawm yog tias graphite isotropy yogtsis yog ib tug taag zoo-nws nyob ntawmmicrostructure thiab kev ua haujlwm, nrog rau cov khoom siv raw, kev tswj cov porosity, txoj kev tsim, thiab cov txheej txheem tiav xws li impregnation. Qhov ntawd kuj yog vim li casisostatic graphitefeem ntau txuas rau isotropic kev ua tau zoo: isostatic nias tuaj yeem tsim cov qauv zoo dua, tab sis isotropy yuav tsum ib txwm ua.txheeb xyuas nrog cov ntaub ntawv muaj cai thiab QC cov ntaub ntawv. Yog tias koj tab tom nrhiav cov khoom siv isotropic graphite, pib los ntawm koj qhov kev ua haujlwm tiag tiag (kub, huab cua, thauj khoom), txheeb xyuas cov khoom tseem ceeb, thiab thov kom muaj cov ntaub ntawv meej meej / kuaj pob - qhov no yog txoj hauv kev ceev tshaj plaws los xaiv cov qib uas ua tau zoo los ntawm kev tsim khoom.