1. Crystallography le Lintho tsa Motheo tsa Silicon Carbide
1.1 Polymorphism le Atomic Bonding ho SiC
(Lipoleiti tsa Ceramic tsa Silicon Carbide)
Silicon carbide (SiC) ke covalent ceramic ntho e entsoeng ka silicon le liathomo tsa carbon ka 1:1 karo-karolelano ea stoichiometric, e khetholloa ka polymorphism ea eona e ikhethang– fedile 250 li-polytypes tse tsebahalang– kaofela li arolelana litlamo tse tiileng tsa tataiso empa li fapana ka ho bokella letoto la li-bilayers tsa Si-C.
E 'ngoe ea li-polytypes tse loketseng haholo ke 3C-SiC (moralo oa motsoako oa zinki oa cubic), le mefuta e mahlakore a mabeli 4H-SiC le 6H-SiC, e 'ngoe le e' ngoe e bonts'a mefuta e poteletseng ea bandgap, motsamao oa elektrone, le conductivity ea mocheso e amang ho tšoaneleha ha tsona bakeng sa lits'ebetso tsa lintlha.
Ho thatafala ha Si– C tlamo, e nang le matla a bond ea hoo e ka bang 318 kJ/mol, e tiisa botsitso bo tsotehang ba SiC (Mohs solidity ea 9– 9.5), boemo bo phahameng ba ho qhibiliha (~ 2700 °C), le ho hanyetsa ho timetsoa ha lik'hemik'hale le mocheso oa mocheso.
Ka lipoleiti tsa ceramic, polytype hangata e khethoa ho latela ts'ebeliso e reriloeng: 6H-SiC e atleha lits'ebetsong tsa meralo ka lebaka la boiketlo ba eona ba ho kopanya, ha 4H-SiC e laola lisebelisoa tsa elektroniki tse matla haholo bakeng sa setulo sa eona sa likooa se fanang ka litefiso tse holimo..
Lekhalo le pharaletseng (2.9– 3.3 eV ho itšetlehile ka polytype) ho phaella moo e etsa hore SiC e be insulator e ikhethang ea motlakase ka mofuta oa eona o hloekileng, leha e ka etsoa doped ho sebetsa joalo ka semiconductor ho lisebelisoa tse khethehileng tsa dijithale.
1.2 Microstructure le Bohloeki ba Stage ka lipoleiti tsa Ceramic
Ts'ebetso ea lipoleiti tsa silicon carbide ceramic e itšetlehile haholo ka likarolo tsa microstructural tse kang boholo ba lijo-thollo, botenya, sethaleng homogeneity, le boteng ba methati kapa ditshila tse eketsehileng.
Lipoleiti tsa boemo bo holimo hangata li entsoe ka li-powder tsa submicron kapa nanoscale SiC tse nang le mekhoa e rarahaneng ea sintering., ho baka hantle, li-microstructures tse teteaneng ka ho feletseng tse eketsang ho tiea ha mochine le ho tsamaisa mocheso.
Litšilafalo tse kang khabone ea complimentary, silika (SiO MABELI), kapa thuso ea sintering joalo ka boron kapa aluminium ea boima bo bobebe e tlameha ho laoloa ka botlalo, kaha li ka etsa lifilimi tsa intergranular tse theolang matla a mocheso o phahameng le ho hanyetsa oxidation.
Porosity e iphetang, hape ka likhato tse fokotsehileng (
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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