1. Melao-motheo ea Sehlahisoa le Sebopeho sa Sebopeho
1.1 Crystal Chemistry le Polymorphism
(Lithako tsa Silicon Carbide)
Silicon carbide (SiC) ke ceramic e kopanetsoeng e entsoeng ka silicon le liathomo tsa carbon tse behiloeng ka har'a tetrahedral latticework., ho nts'etsapele har'a e 'ngoe ea lisebelisoa tse tšoarellang ka nako e telele tsa mocheso le lik'hemik'hale tse utloisisoang.
E teng qetellong 250 mefuta ea polytypic, le 3C (cubic), 4H, le 6H hexagonal mehaho e loketseng ka ho fetisisa bakeng sa ditshebediso tse phahameng tsa mocheso.
Ea matla Si– C litlamo, ka matla a bond ho feta 300 kJ/mol, fana ka ho tiea ho sa tloaelehang, conductivity ea mocheso, le ho hanyetsa mocheso oa mocheso le ho otla ha lik'hemik'hale.
Ka lisebelisoa tsa crucible, SiC e sintered kapa reaction-bonded e khethiloe ka lebaka la bokhoni ba eona ba ho boloka botsitso ba meralo tlas'a likhahla tse matla tsa mocheso le maemo a senyang a qhibilihileng..
Ho fapana le li-ceramics tsa oxide, SiC ha e etse liphetoho tsa mekhahlelo e sitisang joalo ka ntho ea eona ea sublimation (~ 2700 °C), ho etsa hore e lokele mokgoa o tsitsitseng ka hodimo 1600 °C.
1.2 Ts'ebetso ea Thermal le Mechanical
Tšobotsi e hlalosang ea SiC crucibles ke conductivity ea bona e phahameng ea mocheso– ho tloha ho 80 ho 120 W/(m · K)– e bapatsang phallo e tšoanang ea mofuthu le ho fokotsa matšoenyeho a mocheso nakong eohle ea ho futhumatsa ka potlako kapa ho futhumatsa moea.
Sebaka sena sa bolulo se fapana haholo le li-porcelain tse sa sebetseng hantle joalo ka alumina (≈ 30 W/(m · K)), tse hlaselehang habonolo ka lebaka la mocheso o chesang.
SiC e boetse e bonts'a matla a ikhethang a mochini maemong a phahameng a mocheso, retaining over 80% ea boemo ba eona bo thata ba mocheso oa kamore (joalo ka 400 MPa) esita le ho 1400 °C.
Coefficient ea eona e fokotsehileng ea katoloso ea mocheso (~ 4.0 × 10 ⁻⁶/ K) ho eketsa ho hanyetsa mocheso oa mocheso, ho bohlokoa ho nahana ka ho palama baesekele khafetsa lipakeng tsa maemo a mocheso a tikoloho le a sebetsang.
Holim'a moo, SiC e bonts'a ho roala ha premium le ho hanyetsa abrasion, ho etsa bonnete ba hore bophelo ba nako e telele ba ts'ebeletso sebakeng sa sepakapaka se kenyelletsang ho ts'oaroa ka mochini kapa ho potoloha ha metsi a sefefo.
2. Mekhoa ea Tlhahiso le Taolo ea Microstructural
( Lithako tsa Silicon Carbide)
2.1 Mekhoa ea Sintering le Mekhoa ea ho Densification
Li-crucible tsa Industrial SiC li hlahisoa haholo-holo ka sintering e se nang khatello, tlamo ya karabo, kapa ho tobetsa ho chesang, e 'ngoe le e' ngoe e fana ka melemo e ikhethang ka litšenyehelo, bohloeki, le tshebetso.
Ho etsa sintering ntle le khatello ho kenyelletsa ho kopanya phofo e kholo ea SiC ka lithuso tsa sintering tse kang boron le carbon, ho tsamaellana le kalafo e phahameng ya mocheso (2000– 2200 °C )sepakapakeng sa inert ho phethahatsa tekano e haufi-ufi.
Mokhoa ona o fana ka bohloeki bo phahameng, li-crucibles tse matla tse phahameng tse loketseng semiconductor le ts'ebetso ea alloy e tsoetseng pele.
SiC e amanang le maikutlo (RBSC) e entsoe ka ho kenella ka porous carbon preform e nang le silicon e qhibilihisitsoeng, e sebetsanang le ho theha setulo sa β-SiC, ho fella ka motsoako oa SiC le silicon e iphetang.
Ha e ntse e fokotsehile hanyane ka har'a conductivity ea mocheso ka lebaka la litlatsetso tsa tšepe tsa silicon, RBSC e fana ka botsitso bo holimo haholo le theko e tlase ea tlhahiso, ho etsa hore e hlahelle bakeng sa tshebediso e kgolo ya kgwebo.
SiC e hatelitsoeng ka ho chesa, leha e le theko e phahameng ho feta, e fana ka botenya bo boholo le bohloeki, e boloketsoe lits'ebetso tse hlokang haholo joalo ka nts'etsopele ea kristale e le 'ngoe.
2.2 Boleng bo Phahameng ka ho Fetisisa le Ho nepahala ha Geometri
Mochini oa post-sintering, e nang le ho sila le ho hlatsoa, e netefatsa ho hanyetsa ka mokhoa o ikhethileng le libaka tse ka hare tse boreleli tse fokotsang liwebsaete tsa nucleation le ho fokotsa kotsi ea tšoaetso.
Bokhopo bo ka holimo bo laoloa ka hloko haholo ho emisa ho khomarela le ho nolofatsa ho lokolloa ha lihlahisoa tse matlafalitsoeng habonolo.
Geometry ea crucible– joalo ka botenya ba lebota, angle taper, le kobeho e tlase– e ntlafatsoa ho leka-lekanya boima ba mocheso, matla a sebopeho, le ho tsamaellana le heater heater.
Meetso e ikhethileng e amohela melumo e itseng ea ho qhibiliha, litlaleho tse futhumatsang, le kutloisiso ea lintho tse bonahalang, ho netefatsa ts'ebetso e nepahetseng ho pholletsa le lits'ebetso tse fapaneng tsa indasteri.
Taolo ea boleng bo holimo, ho kenyelletsa le X-ray diffraction, ho hlahloba microscope ea elektronike, le tlhahlobo ea ultrasonic, e tiisa homogeneity ea microstructural le ho hloka litaba tse kang li-pores kapa li-splits.
3. Ho hanyetsa lik'hemik'hale le ho sebelisana le Melts
3.1 Ho hloka Boiketlo Mabakeng a Mahlahahlaha
Li-crucible tsa SiC li bonts'a khanyetso e ikhethang khahlanong le tlhaselo ea lik'hemik'hale ka litšepe tse qhibilihisitsoeng, mosa, le matsoai a se nang oxidizing, ho feta lirafshoa tse tloaelehileng tsa graphite le oxide ceramics.
Li sireletsehile ha li kopana le aluminium e qhibilihisitsoeng, koporo, silevera, le li-alloys tsa tsona, ho hanyetsa ho koloba le ho qhibiliha ka lebaka la matla a fokolang a sefahleho le ho thehoa ha li-oxide tse sireletsang holim'a metsi..
Ka silicon le germanium ho sebetsana le photovoltaics le semiconductors, Li-crucible tsa SiC li thibela tšilafalo ea tšepe e ka fokolisang thepa ea bolulo ea dijithale.
Leha ho le joalo, tlasa maemo a oxidizing haholo kapa ponahalong ya diphetoho tsa alkaline, SiC e ka oxidize ho hlahisa silika (SiO ₂), e ka 'nang ea arabela le ho feta ho theha li-silicates tse tlaase-melting-point.
Ka lebaka leo, SiC e tsamaisana hantle le maemo a sa nke lehlakore kapa a fokotsang, moo botsitso ba yona bo phahamisoang.
3.2 Meeli le Mehopolo ea Tšebelisano
Leha e le thata, SiC ha e sebetse hohle; e sebetsana le dihlahiswa tse itseng tse qhibidihileng, haholo tshepe-sehlopha sa tshepe (Fe, Ho, Co) ka mocheso o phahameng o nang le carburization le mekhoa ea ho qhibiliha.
Ts'ebetsong ea tšepe e qhibilihisitsoeng, Li-crucible tsa SiC li senyeha ka potlako 'me ka lebaka leo li qojoa.
Ka tsela e tšoanang, li-antacids le litšepe tsa lefatše tsa alkaline (mohlala, Li, E se e, Ca) e ka fokotsa SiC, ho qala k'habone le ho etsa li-silicone, ho fokotsa ts'ebeliso ea bona ho kopantseng thepa ea betri kapa ho etsa tšepe e sebetsang.
Bakeng sa likhalase tse qhibilihisitsoeng le li-ceramics, SiC hangata e lumellana empa e ka hlahisa silicon hantle ka har'a likhalase tsa optical kapa tsa elektroniki tse bobebe haholo.
Ho ela hloko litšebelisano tsena tse ikhethileng hoa hlokahala bakeng sa ho khetha mofuta o nepahetseng oa crucible le ts'ebetso e netefatsang bohloeki le bophelo bo bolelele bo bolelele..
4. Likopo tsa Liindasteri le Tsoelo-pele ea Theknoloji
4.1 Metallurgy, Semiconductor, le Makala a Matla a Tsosolositsoeng
Li-crucible tsa SiC li bohlokoa tlhahisong ea li-ingots tsa silicon tsa multicrystalline le monocrystalline bakeng sa libeteri tsa letsatsi., moo ba emang nako e telele ba pepesehetse silicon e qhibilihisitsoeng ho ~ 1420 °C.
Tšireletseho ea bona ea mocheso e etsa hore ho be le condensation e ts'oanang le ho fokotsa ts'ebetso ea ho senya, e otlolohileng e susumetsang matla a letsatsi.
Ka lifeme, Li-crucible tsa SiC li sebelisetsoa ho qhibilihisa litšepe tse se nang ferrous joalo ka aluminium le koporo., ho fana ka nako e telele ea bophelo le ho fokotseha ha nts'etsopele ea manya ha e bapisoa le likhetho tsa letsopa-graphite.
Li boetse li sebelisoa ho lab ea mocheso o phahameng bakeng sa tlhahlobo ea thermogravimetric., khalorimetry e fapaneng ea ho lekola, le motsoako oa li-porcelain tse rarahaneng le metsoako ea intermetallic.
4.2 Li-Fads tsa Bokamoso le Motsoako o Tsoetseng Pele oa Lihlahisoa
Lisebelisoa tse ntseng li hlaha li kenyelletsa ts'ebeliso ea li-crucible tsa SiC molemong oa tlhahlobo ea lihlahisoa tsa nyutlelie le li-reactor tse qhibilihisitsoeng tsa letsoai., moo ho lekolwang khanyetso ya tsona kgahlanong le mahlasedi le difluoride tse qhibidihileng.
Liaparo tse kang pyrolytic boron nitride (PBN) kapa yttria (Y PEDI O ₃) li ntse li sebelisoa libakeng tse holim'a SiC ho eketsa ts'ebetso ea lik'hemik'hale le ho emisa ho ata ha silicon lits'ebetsong tsa bohloeki bo phahameng haholo..
Ho etsa tlatsetso ea likarolo tsa SiC tse sebelisang jetting ea binder kapa stereolithography ho ntse ho ntlafatsoa, lijeometri tse khahlang le prototyping e potlakileng bakeng sa meralo e khethehileng ea crucible.
Ha tlhokahalo e ntse e hola ea ho boloka matla, e nkang nako e telele, le ho sebetsana le mocheso o phahameng ntle le tšilafalo, silicon carbide crucibles ka sebele e tla lula e le motheo oa theknoloji ea sejoale-joale tlhahisong ea lihlahisoa tse tsoetseng pele.
Ha re phethela, silicon carbide crucibles e emela ntho ea bohlokoa e lumellang lits'ebetso tsa liindasteri tse phahameng haholo le tsa bongaka.
Motsoako oa bona o ke keng oa lekanngoa oa botsitso ba mocheso, boima ba mochini, le ho hanyetsa lik'hemik'hale ho etsa hore e be thepa ea khetho bakeng sa likopo moo ho sebetsa hantle le ho tšepahala ho leng bohlokoa.
5. Mofani
Advanced Ceramics e thehiloe ka Mphalane 17, 2012, ke khoebo ea theknoloji e phahameng e ikemiselitseng ho etsa lipatlisiso le nts'etsopele, tlhahiso, ho sebetsa, thekiso le lits'ebeletso tsa tekheniki tsa lisebelisoa le lihlahisoa tse amanang le ceramic. Lihlahisoa tsa rona li kenyelletsa empa ha li felle feela ho Lihlahisoa tsa Ceramic tsa Boron Carbide, Lihlahisoa tsa Ceramic tsa Boron Nitride, Silicon Carbide Lihlahisoa tsa Ceramic, Silicon Nitride Lihlahisoa tsa Ceramic, Lihlahisoa tsa Ceramic tsa Zirconium Dioxide, etc. Haeba u thahasella, ka kopo ikutloe u lokolohile ho ikopanya le rona.
Li-tag: Lithako tsa Silicon Carbide, Silicon Carbide Ceramic, Silicon Carbide Ceramic Crucibles
Lingoliloeng tsohle le litšoantšo li tsoa Marang-rang. Haeba ho na le litaba tsa copyright, ka kopo ikopanye le rona ka nako ho hlakola.
Re botse