Hauv thaj chaw dav dav ntawm kev tshawb fawb txog cov ntaub ntawv, silicon carbide ceramics tau dhau los ua "tus hlub" ntawm ntau qhov chaw siv tshuab siab vim lawv cov khoom zoo heev xws li kev nyuaj siab, lub zog siab, kev ruaj khov thermal zoo, thiab kev ruaj khov tshuaj lom neeg. Los ntawm aerospace mus rau kev tsim khoom semiconductor, los ntawm cov tsheb fais fab tshiab mus rau cov tshuab kev lag luam, silicon carbide ceramics ua lub luag haujlwm tseem ceeb. Hauv cov txheej txheem npaj ntawm silicon carbide ceramics, txoj kev sintering yog qhov tseem ceeb txiav txim siab nws cov khoom thiab ntau yam kev siv. Niaj hnub no, peb yuav nkag mus rau hauv cov txheej txheem sintering ntawm silicon carbide thiab tsom mus rau kev tshawb nrhiav cov txiaj ntsig tshwj xeeb ntawm cov tshuaj tiv thaiv sintered.silicon carbide ceramics.
Cov txheej txheem sintering rau silicon carbide
Muaj ntau txoj kev sintering rau silicon carbide, txhua tus muaj nws cov ntsiab cai thiab cov yam ntxwv tshwj xeeb.
1. Kev nias kub sintering: Txoj kev sintering no suav nrog kev muab cov hmoov silicon carbide rau hauv pwm, siv qee qhov siab thaum cua sov, kom ua tiav cov txheej txheem molding thiab sintering tib lub sijhawm. Kev nias kub sintering tuaj yeem tau txais cov khoom siv silicon carbide ntom ntom ntawm qhov kub qis thiab hauv lub sijhawm luv luv, nrog cov noob me me thiab cov khoom siv kho tshuab zoo. Txawm li cas los xij, cov khoom siv nias kub sintering nyuaj, tus nqi pwm siab, cov kev cai tsim khoom nruj heev, thiab tsuas yog cov khoom yooj yim tuaj yeem npaj tau, ua rau muaj kev ua haujlwm tsawg, uas qee qhov txwv nws daim ntawv thov loj.
2. Kev sib xyaw ua ke ntawm huab cua: Kev sib xyaw ua ke ntawm huab cua yog cov txheej txheem ntawm kev sib xyaw ua ke ntawm silicon carbide los ntawm kev ua kom sov nws mus rau 2000-2150 ℃ nyob rau hauv qhov kub thiab txias thiab huab cua tsis muaj zog, los ntawm kev ntxiv cov khoom siv sib xyaw ua ke. Nws muab faib ua ob txoj hauv kev: kev sib xyaw ua ke ntawm cov khoom khov thiab kev sib xyaw ua ke ntawm cov kua. Kev sib xyaw ua ke ntawm cov khoom khov tuaj yeem ua tiav qhov ceev ntawm silicon carbide, tsis muaj iav theem ntawm cov siv lead ua, thiab cov khoom siv kho tshuab kub zoo heev; Kev sib xyaw ua ke ntawm cov kua muaj qhov zoo ntawm qhov kub thiab txias qis dua, qhov loj me ntawm cov noob me dua, thiab cov khoom siv khoov zoo dua thiab cov khoom tawg. Kev sib xyaw ua ke ntawm huab cua tsis muaj kev txwv rau cov duab thiab qhov loj me ntawm cov khoom, cov nqi tsim khoom qis, thiab cov khoom siv zoo heev, tab sis qhov kub thiab txias ntawm kev sib xyaw ua ke siab thiab kev siv hluav taws xob siab.
3. Kev sib xyaw ua ke ntawm cov tshuaj tiv thaiv: Kev sib xyaw ua ke ntawm cov silicon carbide tau raug tsim los ntawm P. Popper thawj zaug hauv xyoo 1950. Cov txheej txheem no suav nrog kev sib xyaw cov pa roj carbon thiab cov hmoov silicon carbide, thiab npaj lub cev ntsuab los ntawm cov txheej txheem xws li kev txhaj tshuaj molding, kev nias qhuav, lossis kev nias txias isostatic. Tom qab ntawd, lub billet raug cua sov rau saum 1500 ℃ hauv qab lub tshuab nqus tsev lossis huab cua inert, thaum lub sijhawm ntawd cov khoom silicon khov kho yaj rau hauv cov kua silicon, uas nkag mus rau hauv cov qhov hws uas muaj cov billet los ntawm kev ua haujlwm capillary. Cov kua silicon lossis cov pa silicon dhau los ua tshuaj tiv thaiv nrog C hauv lub cev ntsuab, thiab cov β-SiC tsim tawm hauv qhov chaw sib xyaw nrog cov khoom SiC thawj hauv lub cev ntsuab los tsim cov tshuaj tiv thaiv sintered silicon carbide ceramic cov ntaub ntawv.
Cov txiaj ntsig ntawm Kev Sib Tsoo Sintering Silicon Carbide Ceramics
Piv rau lwm txoj kev sintering, cov tshuaj tiv thaiv sintered silicon carbide ceramics muaj ntau qhov zoo tseem ceeb:
1. Qhov kub sintering qis thiab tus nqi tswj tau: Qhov kub sintering feem ntau qis dua qhov kub sintering hauv huab cua, txo qis kev siv hluav taws xob thiab qhov yuav tsum tau ua kom kub siab rau cov khoom siv sintering. Qhov kub sintering qis dua txhais tau tias tus nqi kho qis dua rau cov khoom siv thiab txo qis kev siv hluav taws xob thaum lub sijhawm tsim khoom, ua rau txo cov nqi tsim khoom. Qhov no ua rau cov khoom siv sintered silicon carbide ceramics muaj txiaj ntsig zoo hauv kev tsim khoom loj.
2. Yuav luag qhov loj me ntawm cov khoom siv, tsim nyog rau cov qauv nyuaj: Thaum lub sijhawm ua cov txheej txheem sintering, cov khoom siv tsis tshua muaj qhov ntim me me. Cov yam ntxwv no ua rau nws tsim nyog rau kev npaj cov khoom loj, cov qauv nyuaj. Txawm hais tias nws yog cov khoom siv kho tshuab lossis cov khoom siv loj hauv kev lag luam, cov khoom siv sintered silicon carbide ceramics tuaj yeem ua tau raws li qhov yuav tsum tau tsim, txo cov kauj ruam ua tiav tom ntej, txhim kho kev ua haujlwm ntau lawm, thiab tseem txo cov khoom poob thiab cov nqi nce ntxiv los ntawm kev ua tiav.
3. Qib siab ntawm cov khoom siv ntom ntom: Los ntawm kev tswj cov xwm txheej ntawm cov tshuaj tiv thaiv kom zoo, kev sib xyaw ua ke ntawm cov tshuaj tiv thaiv tuaj yeem ua tiav qib siab ntawm kev ntom ntom ntawm silicon carbide ceramics. Cov qauv ntom ntom muab cov khoom siv nrog cov khoom siv zoo heev, xws li lub zog khoov siab thiab lub zog compressive, ua rau nws tswj tau qhov kev ua haujlwm ruaj khov hauv qab lub zog sab nraud loj. Tib lub sijhawm, cov qauv ntom ntom kuj ua rau cov khoom siv tiv taus kev hnav thiab kev tiv thaiv corrosion, ua rau nws ua haujlwm ruaj khov hauv qhov chaw ua haujlwm hnyav thiab ntev nws lub neej kev pabcuam.
4. Kev ruaj khov tshuaj lom neeg zoo: Cov khoom siv silicon carbide uas tau sintered muaj kev tiv thaiv zoo rau cov kua qaub thiab cov hlau molten. Hauv kev lag luam xws li tshuaj lom neeg thiab hlau, cov khoom siv feem ntau yuav tsum tau kov ntau yam corrosive media. Cov khoom siv silicon carbide uas tau sintered tuaj yeem tiv taus kev yaig ntawm cov khoom siv no, xyuas kom meej tias cov khoom siv ua haujlwm ib txwm muaj, txo cov nqi txij nkawm thiab hloov pauv, thiab txhim kho kev ua haujlwm thiab kev ruaj khov ntawm kev tsim khoom.
Siv tau dav hauv ntau qhov chaw
Nrog rau cov txiaj ntsig no, cov tshuaj tiv thaiv sintered silicon carbide ceramics tau siv dav hauv ntau qhov chaw. Hauv thaj chaw ntawm cov khoom siv kiln kub siab, nws tuaj yeem tiv taus qhov chaw kub siab thiab xyuas kom meej tias kev ua haujlwm zoo ntawm cov kilns; Hauv cov hloov pauv cua sov, lawv cov thermal conductivity zoo heev thiab kev tiv thaiv corrosion ua rau lawv yog qhov kev xaiv khoom zoo tagnrho; Hauv cov khoom siv tiv thaiv ib puag ncig xws li desulfurization nozzles, nws tuaj yeem tiv taus kev yaig ntawm cov xov xwm corrosive thiab xyuas kom meej tias kev ua haujlwm ruaj khov ntev ntawm cov khoom siv. Tsis tas li ntawd, cov tshuaj tiv thaiv sintered silicon carbide ceramics kuj ua lub luag haujlwm tseem ceeb hauv cov teb siab xws li photovoltaics thiab aerospace.
Vim yog lawv cov txiaj ntsig tshwj xeeb, cov khoom siv silicon carbide ceramics muaj lub luag haujlwm tseem ceeb hauv tsev neeg silicon carbide ceramic. Nrog rau kev nce qib ntawm thev naus laus zis thiab kev ua kom zoo dua ntawm cov txheej txheem, nws ntseeg tau tias cov khoom siv silicon carbide ceramics uas muaj cov tshuaj tiv thaiv sintered yuav ua pov thawj lawv cov kev ua tau zoo hauv ntau qhov chaw, muab kev txhawb nqa khoom siv rau kev txhim kho ntawm ntau yam kev lag luam.
Lub sijhawm tshaj tawm: Lub Rau Hli-13-2025