Tau ob xyoos dhau los no, vim yog kev hloov pauv ntawm cov thev naus laus zis ntawm cov khoom siv tiv thaiv thermal rau cov roj teeb hluav taws xob tshiab, cov neeg siv khoom xav tau kev ua haujlwm rwb thaiv cua sov zoo dua nrog rau kev tiv thaiv ablation zoo li ceramic - ib qho khoom tseem ceeb rau kev tiv taus hluav taws.
Piv txwv li, qee daim ntawv thov xav tau qhov kub ntawm nplaim taws pem hauv ntej ntawm 1200 ° C thaum tswj qhov kub ntawm sab nraub qaum qis dua 300 ° C. Hauv cov ntaub ntawv aerospace, qhov kub ntawm nplaim taws acetylene pem hauv ntej ntawm 3000 ° C xav tau qhov kub ntawm sab nraub qaum qis dua 150 ° C. Qhov nyuaj tshwj xeeb yog qhov kev thov kom muaj kev ua haujlwm compression hauv cov ua npuas ncauj ceramicized silicone, uas xav tau ob qho tib si compression qis thiab kev khaws cia thermal zoo heev ntawm qhov kub siab. Cov ntaub ntawv no ua ke nthuav tawm cov kev xav tau thermal rwb thaiv tsev tshiab rau cov thev naus laus zis ceramicization.
Cov kev cai tshwj xeeb rau kev ua tau zoo (rau kev siv xwb):
Ua kom cov qauv sov rau ntawm lub platform cua sov raws li qhia hauv qab no. Tswj qhov chaw kub ntawm 600 ± 25 °C rau 10 feeb. Siv kev ntxhov siab ntawm 0.8 ± 0.05 MPa ntawm qhov kub sim, xyuas kom meej tias qhov kub ntawm qhov chaw tom qab tseem qis dua 200 ° C.
Niaj hnub no, peb sau cov ntsiab lus no rau koj siv.
1. Cov Khoom Siv Calcium Silicate Uas Ua Los Ntawm Cov Khoom Siv Hluav Taws Xob - Cov Khoom Siv Hluav Taws Xob Uas Muaj Kev Rwb Thaiv Kub Dawb
Cov calcium silicate ua los ntawm cov khoom siv hluavtaws muaj ob hom: cov qauv porous/spherical thiab cov qauv fibrous zoo li ceramic-fiber. Txawm hais tias muaj qhov sib txawv ntawm cov khoom sib xyaw thiab morphological, ob qho tib si ua haujlwm ua cov khoom siv dawb zoo heev uas tiv taus kub thiab txias.
Synthetic calcium silicate fiber yog ib qho khoom siv ib puag ncig thiabcov khoom siv rwb thaiv tsev kub zoonrog kev tiv taus kub siab txog li 1200-1260 ° C. Cov hmoov fiber ntau calcium silicate uas tau ua tshwj xeeb tuaj yeem ua cov khoom siv fiber ntau rau kev rwb thaiv tsev kub.
Lub sijhawm no, cov khoom siv hluav taws xob uas muaj qhov me me los yog cov calcium silicate kheej kheej muaj cov yam ntxwv dawb siab, yooj yim rau kev sib xyaw, cov qauv nanoporous nplua nuj, cov nqi nqus roj siab heev (txog li 400 lossis siab dua), thiab tsis muaj cov pob slag lossis cov khoom loj. Nws tau ua pov thawj tias siv tau rau hauv cov khoom rwb thaiv tsev uas tiv taus kub siab thiab cov vaj huam sib luag uas tiv taus hluav taws, qhia tau tias muaj peev xwm sib xyaw rau hauv cov khoom siv ceramic ablation-resistant los muab cov khoom rwb thaiv tsev kub siab.
Lwm yam kev siv suav nrog: cov hmoov ua kua ntxiv, cov tshuaj pleev xim kub siab, cov tshuaj tsw qab nqus dej, cov tshuaj tiv thaiv dej ntws, cov ntaub ntawv sib txhuam ntawm lub ncoo nres, roj hmab silicone qis thiab roj silicone uas lwj nws tus kheej, cov ntawv sau, thiab lwm yam.
2. Cov Txheej Txheem Porous Magnesium Aluminium Silicate- Kev rwb thaiv tsev thermal & Kev tiv thaiv kub siab
Cov pob zeb silicate no xav tau kev calcination kub heev nrog rau qhov refractoriness txog li 1200 ° C. Feem ntau yog ua los ntawm magnesium txhuas silicate, nws muaj cov qauv nplua nuj uas muaj cov qauv porous uas muaj zog sib txuas siab, tiv taus dej zoo heev, lub sijhawm refractory ntev, thiab tus nqi tsim nyog.
Nws cov haujlwm tseem ceeb suav nrog kev rwb thaiv tsev kub siab, txo qhov ceev, txhim kho refractoriness, thiab txhim kho ablation tsis kam thiab thermal rwb thaiv tsev rau cov txheej carbon thiab casings. Daim ntawv thov suav nrog cov ntaub ntawv ceramic rwb thaiv tsev, cov txheej txheem tiv thaiv hluav taws zoo tshaj plaws, cov ntaub ntawv rwb thaiv tsev refractory, thiab cov ntaub ntawv rwb thaiv tsev thermal tiv thaiv ablation.
3. Cov Khoom Siv Ceramic Microspheres - Kev Tiv Thaiv Kub Siab, Kev Rwb Thaiv Kub, Lub Zog Compressive
Cov iav microspheres uas tsis muaj qhov khoob yog cov khoom siv rwb thaiv tsev zoo heev, tab sis lawv qhov kub tsis txaus. Lawv cov ntsiab lus mos feem ntau yog li ntawm 650-800 ° C, nrog rau qhov kub yaj ntawm 1200-1300 ° C. Qhov no txwv lawv daim ntawv thov rau cov xwm txheej rwb thaiv tsev kub qis. Nyob rau hauv cov xwm txheej kub siab dua xws li ceramicization thiab ablation tsis kam, lawv ua tsis tau zoo.
Peb cov khoom siv ceramic microspheres hollow daws qhov teeb meem no. Feem ntau yog ua los ntawm aluminosilicate, lawv muaj kev tiv taus kub siab, kev rwb thaiv cua sov zoo heev, kev tiv taus hluav taws xob siab, thiab kev tiv taus tawg zoo heev. Cov ntawv thov suav nrog cov khoom siv silicone ceramic, cov ntaub ntawv rwb thaiv tsev refractory, cov khoom siv kub siab rau cov organic resins, thiab cov khoom siv roj hmab tiv taus kub siab. Cov kev lag luam tseem ceeb suav nrog aerospace, kev tshawb nrhiav dej hiav txwv tob, cov ntaub ntawv sib xyaw, cov txheej txheem, kev rwb thaiv tsev refractory, kev lag luam roj av, thiab cov ntaub ntawv rwb thaiv tsev.
Qhov no yog ib qho hmoov micropowder uas tiv taus cua sov dua uas yooj yim heev rau kev sib xyaw (tsis zoo li cov iav microspheres uas yuav tsum tau tawg ua ntej lossis hloov kho kom ntxiv tau zoo) thiab ua rau pom kev tiv taus qhov tawg zoo heev. Nws qhov tshwj xeeb yog tias nws yog ib yam khoom qhib rau saum npoo uas tsis ntab saum dej, ua rau nws yooj yim rau kev tuab thiab khov.
Tsis tas li ntawd, ib qho lus hais luv luv txoghmoov airgel—ib yam khoom siv rwb thaiv tsev silica uas muaj qhov ntxeem tau. Airgel tau lees paub dav tias yog ib qho khoom rwb thaiv tsev zoo heev, muaj nyob rau hauv cov hydrophobic / hydrophilic variants. Qhov no tso cai rau kev xaiv cov txheej txheem kho kom haum raws li cov khoom siv resin, daws cov teeb meem ntawm airgel hmoov ntawm kev sib kis ultra-light thiab txhim kho nws cov dispersibility. Cov dej-raws li aerogel pastes kuj muaj rau kev koom ua ke yooj yim rau hauv cov kab ke aqueous.
Cov khoom siv rwb thaiv tsev thermal porous tshwj xeeb ntawm airgel hmoov ua rau nws siv tau rau hauv: - Cov roj hmab thiab yas additive carriers - Cov ntaub ntawv rwb thaiv tsev thermal rau cov roj teeb zog tshiab - Cov txheej txheem rwb thaiv tsev hauv tsev - Cov ntaub ntawv rwb thaiv tsev thermal - Cov vaj huam sib luag rwb thaiv tsev thermal - Cov txheej txheem rwb thaiv tsev thermal fireproof - Cov nplaum rwb thaiv tsev thermal.
Lub sijhawm tshaj tawm: Cuaj hlis-22-2025
