Carbon yog ib qho ntawm feem ntau cov ntsiab lus nyob rau hauv cov xwm, encompassing lub zog ntawm ze li ntawm tag nrho cov khoom nyob rau hauv lub ntiaj teb no.Nws nthuav tawm ntau yam ntawm cov yam ntxwv, xws li qhov sib txawv hardness thiab softness, rwb thaiv tsev-semiconductor-superconductor tus cwj pwm, kub rwb thaiv tsev-superconductivity, thiab lub teeb absorption-tag nrho transparency.Ntawm cov no, cov ntaub ntawv nrog sp2 hybridization yog cov tswv cuab tseem ceeb ntawm cov khoom siv carbon tsev neeg, suav nrog graphite, carbon nanotubes, graphene, fullerenes, thiab amorphous glassy carbon.
Graphite thiab Glassy Carbon Samples
Thaum cov ntaub ntawv dhau los tau paub zoo, cia peb tsom mus rau cov iav iav hnub no.Glassy carbon, tseem hu ua glassy carbon los yog vitreous carbon, muab cov khoom ntawm iav thiab ceramics rau hauv cov khoom siv tsis-graphitic carbon.Tsis zoo li crystalline graphite, nws yog amorphous carbon cov khoom uas yog ze li ntawm 100% sp2-hybridized.Glassy carbon yog synthesized los ntawm high-temperature sintering ntawm precursor organic compounds, xws li phenolic resins los yog furfuryl cawv resins, nyob rau hauv ib tug inert gas cua.Nws cov tsos dub thiab du iav zoo li nto tau txais nws lub npe "iav carbon."
Txij li thaum nws thawj qhov kev sib txuas los ntawm cov kws tshawb fawb hauv xyoo 1962, cov qauv thiab cov khoom ntawm cov iav iav tau raug tshawb fawb ntau thiab tseem yog lub ntsiab lus kub hauv cov khoom siv carbon.Glassy carbon tuaj yeem muab faib ua ob hom: Hom I thiab Hom II glassy carbon.Hom I glassy carbon yog sintered los ntawm cov organic precursors ntawm kub hauv qab 2000 ° C thiab muaj feem ntau ntawm randomly oriented curled graphene fragments.Hom II glassy carbon, ntawm qhov tod tes, yog sintered ntawm qhov kub siab dua (~ 2500 ° C) thiab tsim cov amorphous multilayered peb-dimensional matrix ntawm nws tus kheej-assembled fullerene-zoo li kheej kheej cov qauv (raws li qhia hauv daim duab hauv qab no).
Glassy Carbon Structure Sawv Cev (Sab laug) thiab High-resolution Electron Microscopy Image (Sab xis)
Kev tshawb fawb tsis ntev los no tau pom tias Hom II glassy carbon nthuav tawm ntau dua compressibility dua li Hom I, uas yog vim nws tus kheej-assembled fullerene-zoo li spherical lug.Txawm hais tias muaj qhov sib txawv me ntsis, ob qho tib si Hom I thiab Hom II glassy carbon matrices yog qhov tseem ceeb ntawm kev tsis sib haum xeeb curled graphene.
Kev siv Glassy Carbon
Imery carbon muaj ntau cov khoom siv ntom ntom, muaj zog siv tau rau hauv kev tsim khoom xws li kev tsim khoom, kev tsim khoom, thiab hluav taws xob, thiab hluav taws xob, thiab hluav taws xob, thiab hluav taws xob.
01 Cov Kev Siv Kub Kub
Glassy carbon exhibits kub tsis kam nyob rau hauv inert gas los yog lub tshuab nqus tsev ib puag ncig, withstanding kub txog li 3000 ° C.Tsis zoo li lwm yam khoom siv hluav taws xob thiab cov hlau kub kub, lub zog ntawm cov pa roj carbon monoxide nce nrog qhov kub thiab txias tuaj yeem ncav cuag li 2700K yam tsis muaj nkig.Nws kuj muaj cov khoom tsis tshua muaj, tsis tshua muaj cua sov, thiab tsis tshua muaj thermal expansion, ua rau nws haum rau ntau yam kev siv kub, nrog rau cov thermocouple tiv thaiv raj, lub tshuab thauj khoom, thiab cov khoom siv hluav taws xob.
02 Kev siv tshuaj lom neeg
Vim nws qhov siab corrosion kuj, glassy carbon pom nws siv dav hauv tshuaj ntsuam xyuas.Cov khoom siv ua los ntawm cov iav iav muaj qhov zoo dua li cov khoom siv hauv chav sim ua los ntawm platinum, kub, lwm yam hlau tiv taus corrosion, tshwj xeeb ceramics, lossis fluoroplastics.Cov txiaj ntsig zoo no suav nrog kev ua haujlwm rau txhua tus neeg ua haujlwm ntub dej decomposing, tsis muaj kev nco qab (tsis muaj kev tswj xyuas adsorption thiab desorption ntawm cov ntsiab lus), tsis muaj kev sib kis ntawm cov qauv tshuaj ntsuam xyuas, tiv thaiv cov kua qaub thiab alkaline melts, thiab cov iav tsis ntxeem tau.
03 Kev Kho Hniav Technology
Glassy carbon crucibles feem ntau yog siv hauv kev kho hniav technology rau melting precious hlau thiab titanium alloys.Lawv muaj qhov zoo xws li thermal conductivity, ntev lifespan piv rau graphite crucibles, tsis muaj adhesion ntawm molten precious hlau, thermal shock kuj, siv tau rau tag nrho cov muaj nuj nqis hlau thiab titanium alloys, siv nyob rau hauv induction casting centrifuges, creation ntawm tiv thaiv cua tshaj molten hlau, thiab tshem tawm qhov xav tau ntawm flux.
Kev siv cov iav carbon crucibles txo cov cua sov thiab melting lub sij hawm thiab tso cai rau cov cua sov coils ntawm lub melting unit ua hauj lwm nyob rau hauv qis kub tshaj li niaj hnub ceramic ntim, yog li txo lub sij hawm yuav tsum tau rau txhua casting thiab ncua lub crucible lifespan.Ntxiv mus, nws tsis-wettability tshem tawm cov khoom poob kev txhawj xeeb.
04 Daim Ntawv Thov Semiconductor
Glassy carbon, nrog nws cov purity siab, tshwj xeeb corrosion kuj, tsis muaj particle tiam, conductivity, thiab zoo mechanical zog, yog ib qho zoo tagnrho cov khoom rau semiconductor ntau lawm.Crucibles thiab nkoj ua los ntawm cov iav iav tuaj yeem siv rau thaj tsam melting ntawm semiconductor Cheebtsam siv Bridgman los yog Czochralski txoj kev, synthesis ntawm gallium arsenide, thiab ib qho siv lead ua loj hlob.Tsis tas li ntawd, glassy carbon tuaj yeem ua cov khoom hauv ion implantation systems thiab electrodes hauv plasma etching systems.Nws lub siab X-ray pob tshab kuj ua rau cov iav iav uas haum rau X-ray npog substrates.
Hauv kev xaus, glassy carbon muaj cov khoom tshwj xeeb uas suav nrog kev kub siab ua haujlwm, tshuaj lom neeg inertness, thiab kev ua haujlwm zoo heev, ua rau nws tsim nyog rau ntau yam kev siv hauv ntau yam lag luam.
Hu rau Semicera rau kev cai iav carbon cov khoom.
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Post lub sij hawm: Dec-18-2023