Hauv thaj chaw loj ntawm cov ntaub ntawv kev tshawb fawb, silicon carbide ceramics tau dhau los ua "tus hlub" ntawm ntau lub teb chaws high-tech vim lawv cov khoom zoo xws li siab hardness, siab zog, zoo thermal stability, thiab tshuaj stability. Los ntawm aerospace mus rau semiconductor manufacturing, los ntawm lub zog tshiab tsheb mus rau industrial machinery, silicon carbide ceramics ua lub luag haujlwm tseem ceeb. Hauv kev npaj cov txheej txheem ntawm silicon carbide ceramics, txoj kev sintering yog qhov tseem ceeb uas txiav txim siab nws cov khoom thiab daim ntawv thov ntau yam. Niaj hnub no, peb yuav delve rau hauv cov txheej txheem sintering ntawm silicon carbide thiab tsom mus rau kev tshawb nrhiav qhov tshwj xeeb zoo ntawm cov tshuaj tiv thaiv sintered.silicon carbide ceramics.
Feem ntau sintering txoj kev rau silicon carbide
Muaj ntau txoj hauv kev sintering rau silicon carbide, txhua tus muaj nws tus kheej cov qauv thiab cov yam ntxwv.
1. Kub nias sintering: Txoj kev sintering no suav nrog kev tso cov hmoov silicon carbide rau hauv pwm, siv qee lub siab thaum cua sov, ua kom tiav cov txheej txheem molding thiab sintering ib txhij. Kub nias sintering tuaj yeem tau txais cov khoom siv ntom ntom silicon carbide ceramics ntawm qhov kub thiab txias thiab nyob rau lub sijhawm luv luv, nrog cov nplej zoo thiab cov khoom siv zoo. Txawm li cas los xij, cov khoom siv kub nias sintering yog qhov nyuaj, tus nqi pwm yog siab, cov txheej txheem ntau lawm yuav tsum nruj, thiab tsuas yog cov khoom yooj yim tuaj yeem npaj tau, ua rau cov khoom siv qis qis, uas rau qee qhov txwv nws daim ntawv thov loj.
2. Atmospheric siab sintering: Atmospheric siab sintering yog cov txheej txheem ntawm densification sintering ntawm silicon carbide los ntawm cua sov rau 2000-2150 ℃ nyob rau hauv atmospheric siab thiab inert cua tej yam kev mob, los ntawm kev ntxiv tsim nyog sintering pab. Nws muab faib ua ob txoj kev: solid-state sintering thiab kua-theem sintering. Khoom theem sintering tuaj yeem ua tiav qhov ntom ntom ntawm silicon carbide, tsis muaj iav theem ntawm cov muaju, thiab cov khoom siv zoo heev kub kub; Ua kua theem sintering muaj qhov zoo ntawm qhov qis sintering kub, me me grain loj, thiab txhim kho cov ntaub ntawv khoov lub zog thiab tawg toughness. Atmospheric siab sintering tsis muaj kev txwv rau cov khoom zoo thiab qhov loj me, cov nqi tsim khoom tsawg, thiab cov khoom siv zoo heev, tab sis qhov kub thiab txias sintering yog siab thiab siv zog siab.
3. Reaction sintering: Cov tshuaj tiv thaiv sintered silicon carbide yog thawj zaug los ntawm P. Popper hauv xyoo 1950. Cov txheej txheem suav nrog kev sib xyaw cov pa roj carbon monoxide thiab silicon carbide hmoov, thiab npaj lub cev ntsuab los ntawm txoj kev xws li kev txhaj tshuaj molding, qhuav nias, lossis txias isostatic nias. Tom qab ntawd, lub billet yog rhuab mus rau saum toj 1500 ℃ nyob rau hauv lub tshuab nqus tsev los yog inert cua, nyob rau hauv uas taw tes cov khoom silicon melts rau hauv cov kua silicon, uas infiltrates lub billet uas muaj pores los ntawm capillary ua. Cov kua silicon los yog silicon vapor muaj tshuaj lom neeg cov tshuaj tiv thaiv nrog C hauv lub cev ntsuab, thiab cov hauv-situ generated β – SiC ua ke nrog cov thawj SiC hais hauv lub cev ntsuab los tsim cov tshuaj tiv thaiv sintered silicon carbide ceramic cov ntaub ntawv.
Qhov zoo ntawm Reaction Sintering Silicon Carbide Ceramics
Piv rau lwm txoj kev sintering, cov tshuaj tiv thaiv sintered silicon carbide ceramics muaj ntau yam zoo:
1. Tsawg sintering kub thiab tswj tau tus nqi: Cov tshuaj tiv thaiv sintering kub feem ntau yog qis dua atmospheric sintering kub, zoo heev txo lub zog noj thiab kub siab ua hauj lwm yuav tsum tau rau sintering khoom. Qhov qis sintering kub txhais tau tias txo tus nqi kho rau cov khoom siv thiab txo lub zog siv thaum lub sij hawm tsim khoom, txo cov nqi tsim khoom. Qhov no ua rau cov tshuaj tiv thaiv sintered silicon carbide ceramics muaj txiaj ntsig zoo hauv kev tsim khoom loj.
2. Nyob ze ntawm qhov loj me, tsim rau cov txheej txheem nyuaj: Thaum lub sij hawm cov tshuaj tiv thaiv sintering txheej txheem, cov khoom hardly undergoes ntim shrinkage. Cov yam ntxwv no ua rau nws tshwj xeeb tshaj yog tsim rau kev npaj loj-loj, complex zoo li tus qauv tsim. Txawm hais tias nws yog precision mechanical Cheebtsam lossis cov khoom siv loj hauv kev lag luam, cov tshuaj tiv thaiv sintered silicon carbide ceramics tuaj yeem ua tau raws li cov qauv tsim, txo cov txheej txheem tom ntej, txhim kho kev tsim khoom, thiab tseem txo cov khoom poob thiab cov nqi nce los ntawm kev ua haujlwm.
3. High degree ntawm cov ntaub ntawv densification: Los ntawm kev tswj cov tshuaj tiv thaiv tej yam kev mob tsim nyog, cov tshuaj tiv thaiv sintering yuav ua tau ib tug high degree ntawm densification ntawm silicon carbide ceramics. Cov khoom siv tuab ua rau cov khoom siv nrog cov kws kho zoo ua haujlwm zoo nkauj thiab compressive lub zog, ua kom nws tuav cov rog sab nraud tseem ceeb hauv qab. Nyob rau tib lub sijhawm, cov qauv ntom ntom kuj tseem txhim kho qhov hnav tsis kam thiab corrosion tsis kam ntawm cov khoom, cia nws ua haujlwm ruaj khov hauv qhov chaw ua haujlwm hnyav thiab txuas ntxiv nws lub neej kev pab cuam.
4. Kev ruaj ntseg tshuaj zoo: Cov tshuaj tiv thaiv sintered silicon carbide ceramics muaj kev tiv thaiv zoo heev rau cov kua qaub thiab cov hlau molten. Hauv kev lag luam xws li tshuaj lom neeg thiab metallurgical, cov cuab yeej siv feem ntau yuav tsum tau los rau hauv kev sib cuag nrog ntau yam corrosive media. Cov tshuaj tiv thaiv sintered silicon carbide ceramics tuaj yeem tiv thaiv kev yaig ntawm cov xov xwm no, ua kom lub cev ua haujlwm ntawm cov khoom siv, txo cov nqi tu thiab hloov pauv, thiab txhim kho kev tsim khoom txuas ntxiv thiab ruaj khov.
Muaj feem xyuam rau ntau yam
Nrog rau cov txiaj ntsig zoo no, cov tshuaj tiv thaiv sintered silicon carbide ceramics tau siv dav hauv ntau qhov chaw. Nyob rau hauv lub tshav pob ntawm high-temperature kiln khoom, nws muaj peev xwm tiv taus qhov kub thiab txias ib puag ncig thiab xyuas kom meej cov hauj lwm zoo ntawm kilns; Nyob rau hauv tshav kub exchangers, lawv zoo heev thermal conductivity thiab corrosion kuj ua rau lawv ib tug zoo tagnrho cov khoom xaiv; Hauv cov cuab yeej tiv thaiv ib puag ncig xws li desulfurization nozzles, nws tuaj yeem tiv thaiv kev yaig ntawm cov xov xwm corrosive thiab xyuas kom lub sijhawm ntev ntawm cov khoom siv ruaj khov. Tsis tas li ntawd, cov tshuaj tiv thaiv sintered silicon carbide ceramics kuj ua lub luag haujlwm tseem ceeb hauv high-end teb xws li photovoltaics thiab aerospace.
Cov tshuaj tiv thaiv sintered silicon carbide ceramics tuav txoj haujlwm tseem ceeb hauv tsev neeg silicon carbide ceramic vim lawv qhov tshwj xeeb zoo. Nrog rau kev nce qib ntawm kev siv thev naus laus zis thiab kev txhim kho txuas ntxiv ntawm cov txheej txheem, nws ntseeg tau tias cov tshuaj tiv thaiv sintered silicon carbide ceramics yuav ua kom pom lawv cov kev ua tau zoo hauv ntau thaj chaw, muab cov khoom muaj zog txhawb kev loj hlob ntawm ntau yam lag luam.
Post lub sij hawm: Jun-13-2025