Kawm txog cov thermal conductivity carbon cov ntaub ntawv
Yav dhau los hlau (aluminium, tooj liab) cov dab dej kub yog qhov nyuaj rau kev ua kom tau raws li qhov xav tau ntawm cov cua sov dissipation vim muaj teeb meem ntawm qhov ntom ntom, siab thermal expansion coefficient, thiab cov khoom tsis huv. Nrog rau kev loj hlob sai ntawm kev tshawb fawb thiab thev naus laus zis, aerospace, kev sib txuas lus satellite, khoos phis tawj siab thiab lwm yam kev lag luam tau them nyiaj ntau dua rau cov teeb meem kub ntxhov, thiab cov kev xav tau siab dua rau cov khoom siv thermal tswj tau muab tso rau pem hauv ntej.
Vim hais tias ntawm nws cov tsawg ceev, siab zog, siab thermal conductivity, thiab tshuaj lom neeg kuj, carbon ntaub ntawv yuav tsum tau hloov lub yav dhau los hlau cov ntaub ntawv thiab ua ib tug tshiab tiam ntawm siab thermal conductivity cov ntaub ntawv.
Lub tshav kub conduction ntawm cov ntaub ntawv carbon yog tsuas yog paub los ntawm thermal co ntawm lattice atoms. Hom carbon fiber, matrix hom, ntom, tshwj xeeb kub muaj peev xwm, graphitization degree, preform qauv, fiber ntau feem, kev kho cua sov kub / graphitization kub, thiab lwm yam cuam tshuam rau cov khoom siv carbon Lub ntsiab ntawm thermal conductivity.
Tam sim no, feem ntau yog peb hom thermal conductivity carbon cov ntaub ntawv:
1. Cov khoom siv pob zeb diamond
Tam sim no, nws paub tias pob zeb diamond ntuj muaj cov thermal conductivity siab tshaj plaws ntawm cov ntaub ntawv ntuj, thiab nws chav sov thermal conductivity yog li ntawm 2000 txog 2100W / (m∙K). Nyob rau tib lub sijhawm, pob zeb diamond kuj yog ib qho zoo insulator thiab zoo tagnrho substrate tshav kub dissipation khoom. Tam sim no, cov pob zeb diamond carbon zaj duab xis npaj los ntawm cov tshuaj vapor deposition txoj kev muaj qhov zoo ntawm cov khoom zoo thiab tus nqi qis.
2. Cov khoom siv graphite
Graphite yog tsim los ntawm 6 lub ntsej muag prism thiab ob lub ntsej muag kaw. Nws belongs rau cov qauv hexagonal thiab feem ntau muab faib ua ob pawg: ntuj graphite thiab dag graphite. Lub thermal conductivity ntawm graphite zoo tib yam ntawm chav tsev kub tsuas yog 70 txog 150W / (m∙K), thaum lub thermal conductivity ntawm ntuj graphite ntawm 002 siv lead ua dav hlau ntawm chav tsev kub tuaj yeem ncav cuag 2200W / (m∙K). Lub thermal conductivity ntawm qhov chaw kuj tau mus txog 2000W / (m∙K).
3. Cov ntaub ntawv Graphene
Cov khoom siv graphene yog tsim los ntawm ob-dimensional planar qauv tsim los ntawm ib txheej ntawm cov pa roj carbon atoms ze rau hauv ib qho hexagon li niaj zaus. Nws yog ib tug honeycomb zoo thiab yog ib txheej ntawm carbon atom nto khoom exfoliated los ntawm graphite. Micromechanical exfoliation txoj kev, txoj kev loj hlob epitaxial, tshuaj vapor deposition txoj kev thiab graphene oxide tshuaj txo txoj kev yog lub ntsiab kev npaj ntawm graphene. Chav tsev kub thermal conductivity ntawm ib txheej txheej tshem tawm graphene tuaj yeem ncav cuag 3000 txog 5300W / (m∙K) ).
Cov pa roj carbon atom muaj qhov tshwj xeeb. Feem ntau siv cov ntaub ntawv carbon muaj cov qauv loj thiab anisotropy ntawm thermal conductivity, uas yog, lawv muaj thermal conductivity siab nyob rau hauv cov kev taw qhia ntawm graphite siv lead ua dav hlau, thaum lub thermal conductivity ntawm cov siv lead ua dav hlau me me heev. Txoj kev nyiam tshaj plaws txwv nws cov thermal conductivity nyob rau hauv thickness kev taw qhia.
Txawm li cas los xij, qhov zoo ntawm cov ntaub ntawv carbon tsis tuaj yeem tsis quav ntsej. Cov ntaub ntawv tswj xyuas thermal uas ua rau siv lawv cov kev txheeb xyuas thiab sib npaug yog qhov tshwj xeeb tshaj yog tsim nyog rau dissipating tshav kub los ntawm cov khoom siv hluav taws xob loj hauv qhov chaw me me, thiab tuaj yeem ua tau raws li kev tsim kho ntawm cov khoom siv hluav taws xob txuas ntxiv mus, thiab tseem ceeb heev rau txoj kev loj hlob ntawm cov khoom siv hluav taws xob. niaj hnub kev lag luam, kev tiv thaiv lub teb chaws thiab high technology.
