Cov khoom siv hluav taws xob tshiab tau cog lus tias yuav hloov pauv lub peev xwm cryogenic. Silicon nitride, aluminium nitride, thiab qib siab oxide ceramics muaj kev sib txuas ntawm thermal conductivity, hluav taws xob rwb thaiv tsev, thiab thermal shock tsis kam uas tshaj li ib txwm magnesium oxide kev ua tau zoo. Thaum tseem tsis tau tseem ceeb, cov ntaub ntawv no ua rau lub tshuab cua sov tsim tsis yooj yim nrog kev tsim kho.
Silicon nitride (Si₃N₄) muab qhov tshwj xeeb thermal poob siab tiv thaiv- tseem ceeb rau cov ntawv thov cryogenic nrog kev kub ceev ceev. Cov khoom siv tiv taus qhov kub thiab txias hloov ntawm ntau pua degrees ib ob yam tsis muaj cracking, piv rau kaum tawm degrees rau tus qauv MgO. Qhov kev muaj peev xwm no ua rau lub tshuab cua sov tsim nrog cov lus teb sai dua thiab muaj kev ntseeg siab dua hauv kev sib tw thermal hnyav.
Aluminium nitride (AlN) muaj cov thermal conductivity 5-10 npaug siab dua MgO, ua kom muaj kev hloov pauv tau zoo dua los ntawm cov khoom tiv thaiv mus rau sheath. Rau compact cryogenic cua sov qhov twg thermal kuj txwv kev ua tau zoo, AlN rwb thaiv tsev tso cai ntau dua watt ceev los yog txo kev khiav hauj lwm kub rau muab tso zis cua sov. Cov khoom siv kim dua thiab nyuaj rau kev ua haujlwm, tab sis cov txiaj ntsig kev ua tau zoo tso cai rau tus nqi hauv kev thov kev thov.
Raws li
cov ntaub ntawv engineering tshawb fawb, ceramic matrix composites combining oxide thiab nitride theem optimize zog rau tej kev siv. Cov khoom siv hluav taws xob no tuaj yeem tsim kho rau cov thermal conductivity, lub zog dielectric, thiab cov khoom siv kho kom haum raws li qhov xav tau ntawm lub tshuab cua sov. Txoj kev loj hlob ntawm cov ntaub ntawv no sawv cev rau thaj chaw tshawb fawb nquag nrog kev lag luam muaj peev xwm.
Kev tsim cov teeb meem txwv tsis pub siv lub tshuab rhaub ceramic tam sim no. Ceramic forming thiab densification yuav tsum siab - cov txheej txheem kub tsis sib haum nrog cov khoom tiv thaiv embedded. Txoj hauv kev tshiab -ceramic txhaj tshuaj molding, ua ntej-ceramic polymer ua, los yog ceramic txheej ntawm cov qauv zoo tib yam- pab kom muaj kev tsim khoom. Cov txheej txheem no yog qhov nyuaj thiab raug nqi ntau dua li cov qauv MgO compaction.
Hermetic sealing nrog cov ntaub ntawv ceramic muab kev ua tau zoo dua. Ceramic-rau- hlau brazing tsim cov pob qij txha nrog lub tshuab nqus tsev thiab thermal shock tsis kam tshaj iav- rau- hlau seals. Rau ultra-cov ntawv thov kev ntseeg siab cryogenic, cov ntsaws ruaj ruaj siab heev no tshem tawm cov dej noo ingress uas txwv cov pa cua sov lub neej.
Raws li cov qauv kev sim cov ntaub ntawv, ceramic-cov khoom siv hluav taws xob cua sov ua kom pom 2-3x thermal voj voog lub neej piv rau MgO sib npaug, nrog kev txhim kho qhov kub thiab txias thiab cov lus teb sai dua. Qhov zoo ntawm kev ua tau zoo yog tiag tiag tab sis yuav tsum tau hnyav rau 3-5x tus nqi them nqi thiab cov khoom siv tsawg.
Daim ntawv thov tsav tsheb rau lub tshuab cua sov ceramic suav nrog qhov chaw ua haujlwm nrog kaum xyoo-ntev ntev, cov khoom siv kho mob nrog xoom- tsis ua haujlwm siab, thiab cov cuab yeej tshawb fawb uas hloov lub rhaub tsis tuaj yeem ua tsis tau. Nyob rau hauv cov xwm txheej hnyav no, kev tsim kho ceramic tej zaum yuav yog qhov tseem ceeb txawm tias tus nqi thiab muaj kev txwv.
Kev txhim kho yav tom ntej yuav txo cov nqi hluav taws xob ceramic thiab nthuav dav. Kev txhim kho cov txheej txheem tsim khoom, ntsuas - nce ntawm kev tsim khoom, thiab kev sib tw cov khoom lag luam yuav ua rau cov khoom siv siab tshaj no siv tau rau kev siv dav. Cov kws tsim khoom siv yuav tsum saib xyuas qhov kev hloov pauv thev naus laus zis no kom muaj peev xwm saws hauv lawv cov khoom.
