Cov khoom siv silicon carbide (SiC) tau siv dav hauv ntau qhov chaw tsim khoom siab heev vim lawv qhov nyuaj siab, lub zog siab, cov coefficient me me ntawm thermal nthuav dav, thermal conductivity siab, tshuaj lom neeg ruaj khov zoo, thermal shock zoo heev thiab oxidation tsis kam. Ntxiv rau cov yam ntxwv saum toj no ntawm silicon carbide ceramics, porous silicon carbide ceramics, nrog lawv cov qauv microscopic porous tshwj xeeb, muaj kev cia siab dav hauv cov teb xws li metallurgy, chemical engineering, kev tiv thaiv ib puag ncig thiab lub zog, nthuav dav qhov kev siv ntawm silicon carbide ceramics.
Cov khoom tshwj xeeb ntawmporous silicon carbide ceramicfeem ntau tau txais txiaj ntsig los ntawm lawv cov qauv porous tshwj xeeb, uas suav nrog porosity, qhov loj me thiab kev faib tawm, thiab cov duab ntawm pore, thiab lwm yam. Yog li ntawd, nws yog qhov tsim nyog los tswj nws cov porosity, qhov loj me thiab kev faib tawm, nrog rau cov duab ntawm cov pores los ntawm txoj kev npaj kom tau txais cov qauv porous xav tau. Yog li ntawd, nws txoj kev npaj yeej ib txwm yog qhov tseem ceeb ntawm tib neeg txoj kev tshawb fawb. Tsab xov xwm no feem ntau tshuaj xyuas qhov kev nce qib ntawm kev tshawb fawb hauv cov txheej txheem npaj ntawm porous silicon carbide ceramics hauv tsev thiab txawv teb chaws hauv xyoo tas los no.
1. Txoj Kev Siv Lub Cev
Txoj kev siv lub cev yog hais txog qhov tseeb tias cov voids hauv cov khoom siv silicon carbide porous yog tshwm sim los ntawm ntau yam kev tshwm sim ntawm lub cev thaum lub sijhawm npaj, tsis muaj kev tshwm sim ntawm cov tshuaj lom neeg lossis kev tsim cov tshuaj tshiab. Lub hauv paus tseem ceeb yog tsim cov qauv porous los ntawm kev cia siab rau cov voids tshuav tom qab los ntawm kev sib cog lus thermal ntawm cov khoom khov, kev ua kom qhuav ntawm cov kua theem, thiab kev sublimation ncaj qha ntawm cov khoom khov. Cov txheej txheem feem ntau suav nrog txoj kev stacking particle, txoj kev khov-qhuav, txoj kev sol-gel, thiab lwm yam. Cov thev naus laus zis luam ntawv 3D uas tau tshwm sim hauv xyoo tas los no kuj tseem siv tau los luam tawm ncaj qha thiab npaj cov qauv porous.
1.1 Txoj kev sib sau ua ke ntawm cov khoom me me
Txoj kev sintering ntim cov khoom me me yog txoj hauv kev yooj yim tshaj plaws los npaj cov khoom siv silicon carbide uas muaj qhov porous. Lub hauv paus ntsiab lus ntawm txoj kev no yog siv kev ua haujlwm sintering ntawm cov khoom siv ceramic lawv tus kheej los tsim cov caj dab sintering ntawm cov khoom sib txawv SiC, yog li ua rau cov khoom sib sau ua ke los tsim cov khoom siv ceramic uas muaj qhov porous. Txhawm rau kom txo qhov kub sintering, ib qho nyiaj ntawm cov binder nrog qhov melting qis dua feem ntau yog ntxiv los tsim kev sib txuas ntawm cov khoom SiC sib txawv. Txij li thaum tag nrho cov qhov hauv txoj kev sintering ntim cov khoom me me tau hloov pauv los ntawm qhov sib txawv ntawm cov khoom SiC, qhov porosity thiab qhov loj ntawm cov khoom siv ceramic uas muaj qhov porous tiav tuaj yeem tswj tau los ntawm kev hloov qhov loj ntawm hmoov, hom thiab qhov ntxiv ntawm cov binder, thiab cov kev teeb tsa sintering.
Kev npaj cov porous silicon carbide ceramics los ntawm txoj kev stacking particle tsis tas yuav ntxiv cov neeg sawv cev tsim pore ntxiv. Cov txheej txheem yooj yim thiab yooj yim rau kev tswj hwm. Txawm li cas los xij, qhov porosity ntawm porous ceramics npaj los ntawm txoj kev no feem ntau qis. Cov duab, qhov loj me thiab porosity ntawm qhov pores feem ntau yog txiav txim siab los ntawm cov duab, qhov loj me thiab kev faib tawm ntawm cov khoom siv raw, nrog rau qib ntawm sintering.
1.2 Txoj Kev Ua Kom Qhuav Khov
Kev ziab khov yog ib txoj kev uas muaj kev sib xyaw cov khoom siv ceramic nrog dej lossis cov kuab tshuaj organic hauv qhov muaj cov tshuaj dispersants lossis cov binders kom tsim tau cov slurry. Tom qab ntawd, cov slurry uas tau sib xyaw zoo raug nchuav rau hauv pwm thiab khov sai sai ntawm qhov kub qis, ua rau cov kua theem matrix khov sai sai rau hauv cov khoom khov. Tom qab ntawd, cov khoom khov kho raug sublimated thiab tshem tawm los ntawm kev txo qhov siab lossis kev kho kom qhuav hauv lub tshuab nqus tsev. Txoj kev tau txais lub cev ntsuab nrog cov qauv pore uas tau teeb tsa sab hauv cov slurry thiab thaum kawg sintering nws los tsim cov porous silicon carbide ceramics.
1.3 Txoj Kev Luam Ntawv 3D
Txoj kev luam ntawv 3D rau kev npaj cov khoom siv silicon carbide porous yog ib hom txheej txheem npaj tshiab uas tau tsim nyob rau hauv xyoo tas los no. Cov txheej txheem no vam khom rau cov qauv ntaub ntawv peb-seem uas tsim los ntawm kev pab los ntawm kev pab los ntawm lub khoos phis tawj. Los ntawm lub taub hau luam ntawv, cov ntawv nplaum raug txau kom sib sau ua ke cov hmoov khoom siv raw los ntawm txheej rau hauv cov qauv network peb-seem. Kev sib xyaw ua ke ntawm kev luam ntawv 3D thiab cov txheej txheem sintering tuaj yeem ua tiav kev tsim khoom tsis muaj pwm thiab ze-net-loj ntawm cov khoom siv ceramics nyuaj.
Txoj kev luam ntawv 3D rau kev npaj cov khoom siv porous silicon carbide ceramics muaj cov txheej txheem yooj yim, kev npaj siab thiab kev ua haujlwm zoo, thiab tsis tas yuav muaj pwm. Nws tsis yog tsuas yog siv tau los npaj cov khoom siv porous silicon carbide ceramics nrog cov duab nyuaj, cov qauv microstructures sib xws thiab kev sib txuas zoo, tab sis kuj tseem tswj tau thiab hloov kho qhov porosity thiab qhov loj ntawm cov khoom siv porous ceramics. Txawm li cas los xij, txoj kev no tseem nyob rau theem tshawb fawb tshawb nrhiav tam sim no, thiab cov txheej txheem tseem yuav tsum tau ua kom zoo dua. Tsis tas li ntawd, txoj kev no nyuaj rau npaj cov khoom siv porous silicon carbide ceramics muaj zog heev hauv ib kauj ruam. Nws xav tau kev pab ntawm lwm cov txheej txheem los tsim cov khoom xav tau, uas ua rau muaj nqi siab.
1.4 Ua npuas ncauj
Txoj kev ua npuas ncauj molding suav nrog kev ntxiv cov roj lossis cov khoom uas tuaj yeem tsim cov roj los ntawm kev ua tiav tom qab ntawd rau lub cev ntsuab ceramic lossis precursor, thiab tom qab ntawd sintering nws kom tau txais cov khoom siv silicon carbide porous. Tsis zoo li lwm txoj hauv kev npaj, txoj kev ua npuas ncauj yog ib qho txheej txheem zoo rau kev npaj cov khoom siv ceramic kaw-cell.
2. Txoj Kev Siv Tshuaj
Txoj kev siv tshuaj lom neeg yog hais txog qhov tseeb tias cov qauv porous hauv cov porous silicon carbide ceramics yog tsim los ntawm kev rhuav tshem lossis kev cuam tshuam ntawm cov ntsev inorganic lossis cov organic ntxiv, tawm hauv qhov chaw seem hauv qhov chaw qub. Cov txheej txheem tshuaj lom neeg rau kev npaj cov porous silicon carbide ceramics suav nrog txoj kev ntxiv tus neeg sawv cev pore, txoj kev ua npuas ncauj organic impregnation, thiab txoj kev ua qauv biological, thiab lwm yam.
2.1 Kev Ua Npuas Ncauj Organic Impregnation
Txoj kev ua kom cov organic foam impregnation siv cov organic foam ua ib daim template, txheej cov ceramic slurry uas tau npaj tseg rau ntawm daim template lossis muab daim template tso rau hauv cov slurry kom tshem tawm cua, xyuas kom cov slurry lo rau cov organic foam template. Tom qab ntawd, los ntawm kev ziab thiab sintering kub heev, cov organic template raug tshem tawm, yog li ntawd tau txais cov ceramics uas muaj qhov porous.
Qhov tsis zoo tshaj plaws ntawm txoj kev no yog tias nws tsis muaj peev xwm tsim cov khoom me me uas kaw qhov porosity. Cov duab raug txwv thiab kev ua haujlwm ntawm preform raug cuam tshuam los ntawm cov khoom siv raw. Qhov ceev thiab lub zog ntawm cov khoom siv ceramic porous uas tau npaj tseg kuj nyuaj rau tswj.
2.2 Txoj Kev Ntxiv Cov Tshuaj Uas Tsim Cov Qhov Nto
Kev npaj cov khoom siv porous silicon carbide ceramics los ntawm kev ntxiv cov neeg sawv cev tsim cov qhov (pore-forming agents) suav nrog kev ntxiv cov neeg sawv cev tsim cov qhov rau hauv silicon carbide hmoov lossis cov khoom ua ntej, thiab tom qab ntawd tshem tawm cov neeg sawv cev tsim cov qhov los ntawm cov txheej txheem tom qab. Yog li ntawd, qhov chaw uas cov neeg sawv cev tsim cov qhov pib nyob hauv, thiab tom qab ntawd cua sov thiab sintering raug nqa tawm los tsim cov khoom siv porous ceramics. Yog li ntawd, kev hloov pauv hom thiab koob tshuaj ntawm cov neeg sawv cev tsim cov qhov tuaj yeem tswj tau qhov porosity, pore morphology, pore loj thiab kev faib tawm ntawm cov khoom siv porous ceramics tiav lawm. Cov hom neeg sawv cev tsim cov qhov muaj ntau heev, suav nrog cov organic polymers ntuj lossis hluavtaws, kua, ntsev, ceramics lossis lwm yam hmoov, thiab lwm yam. Cov txheej txheem tshem tawm ntawm cov neeg sawv cev tsim cov qhov sib txawv sib txawv. Cov neeg sawv cev tsim cov qhov sib txawv ntawm cov polymer organic feem ntau raug tshem tawm los ntawm kev cua sov thiab kev rhuav tshem, cov neeg sawv cev tsim cov qhov kua tuaj yeem raug tshem tawm los ntawm kev siv crystallization thiab sublimation, ntsev tuaj yeem raug tshem tawm los ntawm kev lim dej, thiab cov hmoov ceramic tuaj yeem raug tshem tawm los ntawm kev lim dej kom haum.
2.3 Txoj Kev Siv Qauv Txheej Txheem Txog Kab Mob
Cov qauv qhov me me hauv cov khoom siv biomaterials txawv ntawm cov khoom siv hluavtaws. Vim nws cov qauv tshwj xeeb, kev npaj cov khoom siv ceramic porous nrog cov qauv zoo sib xws siv cov kab mob ua cov qauv tau txais kev saib xyuas dav dav [10]. Txoj kev qauv biological thiab txoj kev ua npuas ncauj impregnation sib koom zoo sib xws. Txoj kev ua npuas ncauj impregnation siv cov phuam dag ua cov qauv, thaum txoj kev qauv biological siv cov kab mob ntuj ua cov qauv.
Txoj kev ua cov qauv siv rau kev npaj cov khoom siv silicon carbide porous muaj qhov zoo ntawm cov txheej txheem yooj yim thiab tus nqi qis. Nws tuaj yeem tsim cov khoom siv ceramics nrog cov duab nyuaj thiab tuaj yeem rov ua cov qauv ntawm cov khoom siv ntuj tsim rau qhov loj tshaj plaws. Txawm li cas los xij, cov qauv siv rau kev ua cov qauv siv feem ntau yuav tawg thaum lub sijhawm ua cov txheej txheem carbonization kub siab, uas muaj kev cuam tshuam loj rau cov khoom siv kho tshuab ntawm cov khoom siv silicon carbide porous. Ntxiv mus, cov qauv pore ntawm cov khoom siv silicon carbide porous uas tau npaj tseg feem ntau nyob ntawm cov qauv me me ntawm cov qauv siv rau kev ua ...
Lub sijhawm tshaj tawm: Lub Xya Hli-22-2025