Cov khoom siv silicon carbide (SiC) ceramicsLawv paub txog lawv lub zog zoo kawg nkaus, tiv taus cua sov, thiab ua tau ntev. Cov yam ntxwv no ua rau lawv zoo tagnrho rau kev siv rau hauv cov chaw nyuaj, xws li lub cav aerospace lossis cov tshuab kev lag luam. Tab sis cov ntaub ntawv siab heev no tau tsim li cas? Cia peb piav qhia cov txheej txheem ib kauj ruam zuj zus.
1. Kev Npaj Khoom Siv Raw
Txhua yam pib nrog cov hmoov silicon carbide uas muaj purity siab. Xav txog qhov no ua "hmoov" rau ci ib lub "ncuav mog qab zib" uas yog ceramic. Txhawm rau txhim kho cov khoom kawg, cov khoom ntxiv me me - xws li txhuas oxide lossis boron compounds - raug sib xyaw ua ke. Cov khoom ntxiv no ua haujlwm zoo li kua nplaum thaum lub sijhawm tom qab, pab cov khoom sib txuas zoo dua.
2. Ua kom zoo li lub khob iav
Cov hmoov ntawd ces muab hloov mus ua ib daim uas pwm tau. Muaj ob txoj kev siv ntau:
Kev Nias: Cov hmoov raug nias rau hauv ib daim duab tshwj xeeb siv lub siab siab, zoo ib yam li kev nias daus rau hauv lub pob daus.
Kev Txhaj Tshuaj Moulding: Cov hmoov yog sib xyaw nrog cov khoom siv ib ntus (zoo li quav ciab) los tsim cov khoom sib xyaw zoo li khob noom cookie, uas yog txhaj rau hauv cov pwm rau cov duab nyuaj.
Nyob rau theem no, cov khoom tseem tsis khov kho - zoo li cov xuab zeb qhuav - thiab yuav tsum tau "ci" kom muaj zog.
3. Cov Txheej Txheem Sintering
Qhov no yog qhov uas lub khawv koob tshwm sim. Cov khoom siv ceramic uas zoo li no raug cua sov hauv lub cub tawg tshwj xeeb ntawm qhov kub siab heev (feem ntau siab dua 1,800 ° C). Thaum lub sijhawm sintering, ob yam tseem ceeb tshwm sim:
Cov Khoom Sib Txuas: Cov noob silicon carbide loj hlob ze dua, tshem tawm cov qhov sib txawv thiab tsim cov qauv khov kho.
Cov Khoom Siv Ntxiv Ua Haujlwm: Cov tshuaj ntxiv yaj me ntsis, tsim kom muaj "choj" ntawm cov khoom me me kom txhim kho kev tawv.
Ib puag ncig hauv lub cub tawg raug tswj hwm kom zoo—qee zaum puv nrog cov pa roj inert—kom tiv thaiv cov tshuaj tiv thaiv tsis xav tau.
4. Kev Kho Kom Tiav
Tom qab sintering, cov ceramic yuav raug kho ntxiv kom txhim kho nws cov kev ua tau zoo:
Kev Txhuam: Rau cov ntawv thov uas xav tau cov nplaim du (piv txwv li, cov ntsaws ruaj ruaj lossis cov kabmob).
Txheej: Ib txheej tiv thaiv nyias nyias (xws li silicon nitride) tuaj yeem ntxiv rau kom txhawb kev hnav tsis kam.
Kev Siv Tshuab: Kev txiav los yog kev tho qhov kom ua tiav qhov ntev kawg.
Vim Li Cas Cov Txheej Txheem No Tseem Ceeb
Qhov zais cia rau lub zog ntawm silicon carbide yog nyob rau hauv nws cov atoms sib txuas thaum lub sijhawm sintering. Cov txheej txheem kub siab tsim ib lub network ntawm cov pob zeb silicon-carbon muaj zog, uas tiv taus cua sov, xeb, thiab kev ntxhov siab ntawm lub cev. Cov khoom ntxiv thiab kev tswj qhov kub kom meej ua kom cov khoom kawg tsis yog tsuas yog tawv tab sis kuj tawv txaus kom tiv taus kev tawg.
Daim Duab Loj Dua
Txij li cov turbines tshiab tshaj plaws mus rau cov kab ke tswj kev ua qias tuaj, cov khoom siv silicon carbide ceramics ua lub luag haujlwm tseem ceeb hauv cov thev naus laus zis niaj hnub no. Txawm hais tias cov txheej txheem tsim khoom nyuaj heev, nws yog qhov kev sib npaug ntawm kev tshawb fawb thiab kev tsim kho uas ua rau cov hmoov yooj yim hloov mus ua cov khoom siv uas muaj peev xwm tiv taus cov xwm txheej nyuaj tshaj plaws.
Raws li kev tshawb fawb nce qib, cov txheej txheem tshiab - zoo li 3D luam ntawv ntawm cov khoom siv ceramics - tab tom tshwm sim, cog lus tias yuav siv cov khoom siv tshiab dua rau cov khoom siv zoo kawg no.
Lub sijhawm tshaj tawm: Lub Peb Hlis-19-2025