1. Crystallography le Melao-motheo ea Lintho tsa Silicon Carbide
1.1 Polymorphism le Atomic Bonding ho SiC
(Lipoleiti tsa Ceramic tsa Silicon Carbide)
Silicon carbide (SiC) ke covalent ceramic motsoako entsoe ka silicon le carbon liathomo ka 1:1 tekanyo ea stoichiometric, e khetholloang ke polymorphism ea eona e makatsang– fedile 250 li-polytype tse tsebahalang– kaofela li arolelana litlamo tse matla tsa covalent empa li fapana ka ho bokella letoto la li-bilayers tsa Si-C.
E 'ngoe ea li-polytypes tse amehang ka ho fetisisa tsa theknoloji ke 3C-SiC (sebopeho sa motsoako oa cubic zinki), le mefuta e mahlakore a mabeli 4H-SiC le 6H-SiC, e 'ngoe le e' ngoe e bonts'a mefuta e hloekisitsoeng ka har'a bandgap, ho tenyetseha ha elektronike, le conductivity ea mocheso e susumetsang ho sebetsa ha tsona bakeng sa lisebelisoa tse itseng.
Ho thatafala ha Si– C tlamo, ka bond matla a ho pota-pota 318 kJ/mol, e tiisa ho tiea ho makatsang ha SiC (Mohs solidity ea 9– 9.5), boemo bo phahameng ba ho qhibiliha (~ 2700 °C), le ho hanyetsa ho senyeha ha lik'hemik'hale le mocheso oa mocheso.
Ka lipoleiti tsa ceramic, polytype ka kakaretso e khethoa ho ipapisitsoe le tšebeliso e reretsoeng: 6H-SiC e atleha lits'ebetsong tsa meralo ka lebaka la boiketlo ba eona ba ho kopanya, ha 4H-SiC e laola lisebelisoa tsa elektronike tse matla haholo bakeng sa tefiso ea eona e ikhethang.
Lekhalo le leholo (2.9– 3.3 eV ho itšetlehile ka polytype) e boetse e etsa hore SiC e be insulator e ntle ea motlakase ka sebopeho sa eona se hloekileng, leha e ka etsoa doped ho sebetsa joalo ka semiconductor lisebelisoa tse khethehileng tsa elektroniki.
1.2 Microstructure le Bohloeki ba Stage ka lipoleiti tsa Ceramic
Bokhoni ba lipoleiti tsa ceramic tsa silicon carbide bo itšetlehile haholo ka litšobotsi tsa microstructural tse kang boholo ba lijo-thollo., botenya, sethaleng homogeneity, le ponahalo ya mekgahlelo ya bobedi kapa ditshila.
Lipoleiti tsa boemo bo holimo hangata li entsoe ka li-powder tsa submicron kapa nanoscale SiC ka mekhoa e tsoetseng pele ea sintering., ho baka hantle, li-microstructures tse teteaneng ka ho feletseng tse ntlafatsang matla a mochine le ho tsamaisa mocheso.
Lintho tse silafatsang tse kang k'habone ea complimentary, silika (SiO ₂), kapa thuso ea sintering joalo ka boron kapa aluminium e tlameha ho laoloa ka hloko, kaha li ka etsa lifilimi tsa intergranular tse fokotsang matla a mocheso o phahameng le ho hanyetsa oxidation.
Mesaletsa ea porosity, esita le maemong a tlase (
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 tse amanang le ceramic joalo ka Silicon Carbide Ceramic Plates. 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: poleiti ea silicon carbide,poleiti ea carbide,letlapa la silicon carbide
Lingoliloeng tsohle le litšoantšo li tsoa Marang-rang. Haeba ho na le litaba tsa copyright, ka kopo ikopanye le rona ka nako ho hlakola.
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