Cov khoom siv silicon carbide (SiC) ceramicstau dhau los ua cov khoom siv tseem ceeb hauv kev ua cov khoom siv ceramics kub siab vim lawv cov coefficient nthuav dav thermal qis, thermal conductivity siab, hardness siab, thiab thermal thiab tshuaj lom neeg ruaj khov zoo heev. Lawv tau siv dav hauv cov teb tseem ceeb xws li aerospace, nuclear zog, tub rog, thiab semiconductors.
Txawm li cas los xij, cov kev sib txuas lus covalent muaj zog heev thiab cov coefficient diffusion qis ntawm SiC ua rau nws nyuaj rau densification. Txog qhov kawg no, kev lag luam tau tsim ntau yam thev naus laus zis sintering, thiab SiC ceramics npaj los ntawm ntau yam thev naus laus zis muaj qhov sib txawv tseem ceeb hauv microstructure, cov khoom, thiab cov xwm txheej siv. Nov yog kev tshuaj xyuas ntawm cov yam ntxwv tseem ceeb ntawm tsib lub silicon carbide ceramics.
1. Cov khoom siv SiC uas tsis muaj zog sintered (S-SiC)
Cov txiaj ntsig tseem ceeb: Haum rau ntau txoj kev molding, tus nqi qis, tsis txwv los ntawm cov duab thiab qhov loj me, nws yog txoj kev sintering yooj yim tshaj plaws kom ua tiav cov khoom loj. Los ntawm kev ntxiv boron thiab carbon rau β - SiC uas muaj cov pa oxygen me me thiab sintering nws nyob rau hauv ib puag ncig inert huab cua ntawm ib ncig ntawm 2000 ℃, lub cev sintered nrog qhov ceev theoretical ntawm 98% tuaj yeem tau txais. Muaj ob txoj hauv kev: theem khoom thiab theem kua. Tus qub muaj qhov ceev thiab purity siab dua, nrog rau kev ua haujlwm thermal siab thiab lub zog kub siab.
Cov ntawv thov ib txwm muaj: Kev tsim cov nplhaib sib khi uas tiv taus kev hnav thiab tiv taus xeb thiab cov kabmob swb; Vim nws qhov nyuaj siab, qhov hnyav tshwj xeeb qis, thiab kev ua tau zoo ballistic, nws yog siv dav ua cov cuab yeej tiv thaiv mos txwv rau cov tsheb thiab nkoj, nrog rau kev tiv thaiv cov neeg pej xeem lub thawv nyiaj thiab cov tsheb thauj nyiaj ntsuab. Nws qhov kev tiv thaiv ntau qhov ntaus zoo dua li cov khoom siv SiC ib txwm muaj, thiab qhov tawg ntawm cov cuab yeej tiv thaiv cylindrical tuaj yeem ncav cuag ntau dua 65 tons.
2. Cov khoom siv SiC uas tau sintered (RB SiC)
Cov txiaj ntsig tseem ceeb: Kev ua haujlwm zoo heev, muaj zog heev, tiv taus corrosion, thiab tiv taus oxidation; Qhov kub thiab nqi sintering qis, muaj peev xwm tsim ze li ntawm qhov loj me. Cov txheej txheem no suav nrog kev sib xyaw cov pa roj carbon nrog hmoov SiC los tsim cov billet. Thaum kub siab, cov silicon molten nkag mus rau hauv cov billet thiab cuam tshuam nrog cov pa roj carbon los tsim β - SiC, uas sib xyaw nrog cov α - SiC thawj thiab puv cov qhov hws. Qhov hloov pauv loj thaum lub sijhawm sintering yog me me, ua rau nws tsim nyog rau kev tsim khoom lag luam ntawm cov khoom lag luam nyuaj.
Cov ntawv thov ib txwm muaj: Cov khoom siv kub kub, cov raj xa hluav taws xob, cov khoom hloov pauv cua sov, cov nozzles desulfurization; Vim nws cov coefficient nthuav dav thermal tsawg, cov modulus elastic siab, thiab cov yam ntxwv ze ntawm lub net, nws tau dhau los ua cov khoom siv zoo tagnrho rau cov chaw reflectors; Nws kuj tseem tuaj yeem hloov cov iav quartz ua lub cuab yeej txhawb nqa rau cov raj hluav taws xob thiab cov khoom siv semiconductor chip manufacturing.
3. Cov khoom siv SiC kub nias sintered (HP SiC)
Qhov zoo ntawm lub hauv paus: Kev sib xyaw ua ke hauv qhov kub thiab siab, cov hmoov yog nyob rau hauv lub xeev thermoplastic, uas yog qhov zoo rau cov txheej txheem hloov pauv loj. Nws tuaj yeem tsim cov khoom nrog cov noob zoo, qhov ceev ceev, thiab cov khoom siv kho tshuab zoo ntawm qhov kub qis dua thiab hauv lub sijhawm luv dua, thiab tuaj yeem ua tiav qhov ceev ceev thiab ze li ntawm lub xeev sintering ntshiab.
Daim ntawv thov ib txwm muaj: Chiv thawj siv ua cov tsho tiv thaiv mos txwv rau cov neeg ua haujlwm hauv Asmeskas thaum Tsov Rog Nyab Laj, kev ua lag luam armor tau hloov los ntawm cov kub nias boron carbide; Tam sim no, nws feem ntau yog siv rau hauv cov xwm txheej muaj nqis ntxiv, xws li cov teb uas muaj cov kev xav tau siab heev rau kev tswj cov khoom sib xyaw, kev huv si, thiab kev sib sau ua ke, nrog rau kev hnav-resistant thiab nuclear kev lag luam teb.
4. Cov khoom siv SiC uas tau rov ua dua tshiab (R-SiC)
Qhov zoo ntawm lub hauv paus: Tsis tas yuav ntxiv cov khoom siv sintering, nws yog ib txoj kev siv ntau rau kev npaj cov khoom siv SiC uas muaj purity siab heev thiab loj. Cov txheej txheem no suav nrog kev sib xyaw cov hmoov SiC ntxhib thiab zoo sib npaug thiab tsim lawv, sintering lawv hauv huab cua inert ntawm 2200 ~ 2450 ℃. Cov khoom me me ua pa thiab condense ntawm qhov sib cuag ntawm cov khoom ntxhib los ua cov khoom siv ceramics, nrog qhov nyuaj thib ob tsuas yog pob zeb diamond. SiC khaws cia lub zog kub siab, tiv taus corrosion, tiv taus oxidation, thiab tiv taus thermal shock.
Cov ntawv thov ib txwm muaj: Cov rooj tog kub kub, cov khoom hloov pauv cua sov, cov qhov cub tawg; Hauv kev lag luam aerospace thiab tub rog, nws yog siv los tsim cov khoom siv hauv spacecraft xws li cav, tail fins, thiab fuselage, uas tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom siv thiab lub neej kev pabcuam.
5. Cov khoom siv SiC uas muaj silicon infiltrated (SiSiC)
Cov txiaj ntsig tseem ceeb: Zoo tshaj plaws rau kev tsim khoom lag luam, nrog lub sijhawm luv luv sintering, qis kub, tag nrho ntom thiab tsis deformed, ua los ntawm SiC matrix thiab infiltrated Si theem, muab faib ua ob txoj hauv kev: kua infiltration thiab roj infiltration. Qhov kawg muaj tus nqi siab dua tab sis zoo dua qhov ceev thiab sib xws ntawm cov silicon dawb.
Cov ntawv thov ib txwm muaj: porosity qis, airtightness zoo, thiab tsis tshua muaj kev tiv thaiv yog qhov zoo rau kev tshem tawm hluav taws xob zoo li qub, tsim nyog rau kev tsim cov khoom loj, nyuaj lossis hollow, siv dav hauv cov khoom siv ua semiconductor; Vim nws cov modulus elastic siab, lub teeb yuag, lub zog siab, thiab airtightness zoo heev, nws yog cov khoom siv ua tau zoo tshaj plaws hauv thaj chaw aerospace, uas tuaj yeem tiv taus cov khoom thauj hauv qhov chaw ib puag ncig thiab xyuas kom meej tias cov khoom siv raug thiab kev nyab xeeb.
Lub sijhawm tshaj tawm: Cuaj hlis-02-2025