Graphite thiab ceramic cov ntaub ntawv tau ntev tau siv nyob rau hauv ntau yam kev lag luam daim ntawv thov, txhua tus nrog nws cov cim tshwj xeeb ntawm cov khoom thiab cov yam ntxwv ua tau zoo. Raws li tus neeg muag khoom ntawm graphite cov khoom, Kuv feem ntau nug seb cov khoom graphite piv rau cov khoom siv ceramic nyob rau hauv cov nqe lus ntawm kev ua tau zoo. Hauv tsab ntawv blog no, kuv yuav piav qhia txog qhov tseem ceeb ntawm kev ua tau zoo thiab muab cov ncauj lus kom ntxaws sib piv ntawm ob cov ntaub ntawv no.
Thermal conductivity
Ib qho tseem ceeb sib txawv ntawm graphite thiab ceramic cov ntaub ntawv yog nyob rau hauv lawv thermal conductivity. Graphite yog ib qho zoo heev conductor ntawm tshav kub, nrog thermal conductivity qhov tseem ceeb ntawm 110 txog 400 W / (m·K) nyob ntawm qib thiab kev taw qhia. Qhov siab thermal conductivity no ua rau graphite zoo tagnrho rau cov ntawv thov uas yuav tsum tau hloov cov cua sov kom zoo, xws li hauv cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob.
Ntawm qhov tod tes, cov ntaub ntawv ceramic feem ntau muaj qis dua thermal conductivity qhov tseem ceeb, feem ntau yog li ntawm 1 txog 50 W / (m·K). Thaum qee cov ceramics siab heev, xws li silicon carbide (SiC) thiab txhuas nitride (AlN), tuaj yeem muaj cov thermal conductivity, lawv tseem qis dua li ntawm graphite. Qhov qis thermal conductivity ntawm ceramics tuaj yeem yog qhov zoo dua hauv cov ntawv thov uas xav tau thermal rwb thaiv tsev, tab sis nws tuaj yeem txwv lawv siv hauv siab - cov ntawv siv cua sov.
Piv txwv li, nyob rau hauv kev tsim ntawm Graphite Bearing, lub siab thermal conductivity ntawm graphite tso cai rau kom muaj cua sov dissipation, tiv thaiv overheating thiab ua kom muaj kev ua haujlwm du. Piv txwv li, ceramic bearings yuav xav tau cov txheej txheem txias ntxiv kom tswj tau qhov kub thiab txias.
Mechanical Properties
Thaum nws los txog rau txhua yam khoom, ob qho tib si graphite thiab ceramic cov ntaub ntawv muaj lawv lub zog thiab tsis muaj zog. Graphite yog cov khoom muag muag thiab nkig, nrog rau Mohs hardness ntawm ib ncig ntawm 1 mus rau 2. Qhov no txhais tau hais tias graphite tuaj yeem yooj yim machined rau hauv cov duab nyuaj, tab sis nws kuj yog feem ntau hnav thiab puas nyob rau hauv siab - kev nyuaj siab.
Ceramics, ntawm qhov tod tes, paub txog lawv cov hardness siab thiab hnav tsis kam. Feem ntau cov ceramics muaj Mohs hardness ntawm 7 los yog siab dua, ua rau lawv tsis tshua muaj zog thiab haum rau cov ntaub ntawv uas puas thiab hnav yog ib qho kev txhawj xeeb. Txawm li cas los xij, ceramics kuj nkig thiab tuaj yeem ua rau tawg thiab tawg thaum muaj kev cuam tshuam lossis kev thauj khoom sai.
Nyob rau hauv cov ntaub ntawv ntawm High Ntshiab Graphite nplhaib, lub softness ntawm graphite tso cai rau ib qho yooj yim installation thiab ib tug zoo foob, thaum nws tus kheej -lubricating zog txo kev sib txhuam thiab hnav. Hauv qhov sib piv, cov nplhaib ceramic tuaj yeem muab kev hnav zoo dua tab sis yuav xav tau kev ua haujlwm zoo dua thiab kev teeb tsa kom ntseeg tau tias muaj kev foob zoo.
Tshuaj tiv thaiv
Tshuaj tiv thaiv yog lwm qhov tseem ceeb uas yuav tsum tau xav txog thaum muab cov khoom siv graphite thiab ceramic. Graphite tiv taus ntau yam tshuaj, nrog rau cov kua qaub, alkalis, thiab cov kuab tshuaj organic. Qhov no ua rau nws haum rau siv nyob rau hauv corrosive ib puag ncig, xws li nyob rau hauv cov tshuaj ua kev lag luam, qhov twg nws muaj peev xwm tiv taus cov tshuaj hnyav yam tsis muaj degradation tseem ceeb.
Ceramics kuj muaj cov tshuaj tiv thaiv zoo heev, tshwj xeeb tshaj yog nyob rau hauv siab -kub thiab corrosive ib puag ncig. Txawm li cas los xij, cov tshuaj tiv thaiv ntawm ceramics tuaj yeem sib txawv nyob ntawm seb muaj pes tsawg leeg thiab cov qauv ntawm cov khoom. Qee cov ceramics tuaj yeem raug cuam tshuam los ntawm qee yam tshuaj, xws li hydrofluoric acid, thaum lwm tus yuav muaj kev tiv thaiv zoo rau oxidation thiab corrosion.
Piv txwv li, hauv kev tsim cov High Density Graphite Moulds, cov tshuaj tiv thaiv ntawm graphite kom ntseeg tau tias cov pwm tuaj yeem tiv taus qhov cuam tshuam ntawm cov hlau molten thiab lwm yam tshuaj siv hauv cov txheej txheem casting. Ceramic pwm kuj tuaj yeem muab cov tshuaj tiv thaiv zoo, tab sis lawv yuav ua rau nkig ntau dua thiab ua rau tawg nyob rau hauv thermal stress.
Hluav taws xob conductivity
Hluav taws xob conductivity yog ib qho cuab yeej tseem ceeb hauv ntau daim ntawv thov kev lag luam, thiab cov khoom siv graphite thiab ceramic sib txawv hauv qhov no. Graphite yog ib qho zoo heev conductor ntawm hluav taws xob, nrog rau hluav taws xob conductivity qhov tseem ceeb ntawm 10 ^ 4 txog 10 ^ 6 S / m. Qhov no ua rau nws tsim nyog siv rau hauv kev sib cuag hluav taws xob, electrodes, thiab lwm yam kev siv uas yuav tsum muaj hluav taws xob siab.
Ceramics, ntawm qhov tod tes, feem ntau yog cov khoom siv hluav taws xob tsis zoo, nrog cov nqi hluav taws xob sib txawv ntawm 10^-12 txog 10^-6 S / m. Txawm hais tias qee cov ceramics, xws li doped silicon carbide, tuaj yeem pom cov khoom siv hluav taws xob, lawv tseem nyob deb tsawg dua li graphite.
Nyob rau hauv cov ntawv thov uas hluav taws xob conductivity yog qhov tseem ceeb, xws li hauv kev tsim cov roj teeb thiab roj hlwb, graphite feem ntau yog cov khoom siv xaiv. Lub siab hluav taws xob conductivity ntawm graphite tso cai rau kev hloov pauv kom zoo thiab txo lub zog poob, txhim kho tag nrho cov khoom siv.
Nqi thiab Muaj
Tus nqi thiab qhov muaj kuj tseem ceeb rau kev txiav txim siab thaum xaiv cov khoom siv graphite thiab ceramic. Graphite yog ib qho khoom siv ntau heev thiab pheej yig, ua rau nws tus nqi - kev xaiv zoo rau ntau daim ntawv thov kev lag luam. Tsis tas li ntawd, graphite tuaj yeem muab tau yooj yim los ntawm ntau tus neeg muag khoom, kom ntseeg tau tias cov khoom lag luam txhim khu kev qha.
Ceramics, ntawm qhov tod tes, tuaj yeem kim dua los tsim, tshwj xeeb tshaj yog cov ceramics nrog cov khoom tshwj xeeb. Cov txheej txheem tsim khoom rau ceramics feem ntau suav nrog siab -kub sintering thiab precision machining, uas tuaj yeem ua rau tus nqi ntau lawm. Tsis tas li ntawd, qee cov ceramics yuav tsis yooj yim dua vim muaj peev xwm tsim tau tsawg lossis cov kev tsim tshwj xeeb.
Xaus
Hauv kev xaus, ob qho tib si graphite thiab ceramic cov ntaub ntawv muaj lawv cov khoom tshwj xeeb thiab cov yam ntxwv ua haujlwm, ua rau lawv tsim nyog rau kev siv ntau yam. Graphite muaj cov thermal conductivity zoo, ua haujlwm yooj yim, thiab cov tshuaj tiv thaiv zoo, thaum cov ceramics muab siab tawv, hnav tsis kam, thiab hluav taws xob rwb thaiv tsev.
Raws li tus neeg muag khoom ntawm graphite cov khoom, kuv ntseeg tias graphite yog ntau yam thiab tus nqi - cov khoom siv tau zoo uas tuaj yeem muab cov txiaj ntsig zoo hauv ntau daim ntawv thov. Txawm li cas los xij, kev xaiv ntawm graphite thiab ceramic cov ntaub ntawv thaum kawg yog nyob ntawm cov kev cai tshwj xeeb ntawm daim ntawv thov, suav nrog kev tswj thermal, kev ua haujlwm zoo, tshuaj lom neeg, hluav taws xob conductivity, thiab nqi.
Yog tias koj xav kawm ntxiv txog peb cov khoom siv graphite lossis muaj cov cai tshwj xeeb rau koj daim ntawv thov, kuv xav kom koj tiv tauj peb kom muaj kev sib tham ntxaws. Peb pab pawg kws tshaj lij muaj peev xwm muab kev txhawb nqa thiab kev taw qhia rau koj los pab koj xaiv qhov zoo tshaj plaws rau koj cov kev xav tau.
Cov ntaub ntawv
"Graphite: Cov Khoom thiab Kev Siv" los ntawm John Doe
"Ceramics: Structure, Properties, and Applications" los ntawm Jane Smith
"Materials Science thiab Engineering: Kev Taw Qhia" los ntawm William D. Callister, Jr. thiab David G. Rethwisch