1. Crystallography iyo Aasaaska Qalabka ee Silicon Carbide
1.1 Polymorphism iyo Isku xidhka atomiga ee SiC
(Taarikada dhoobada ee Silicon Carbide)
Silikoon carbide (SiC) waa walax dhoobo ah oo ka samaysan silikoon iyo atamka kaarboon ee ku jira a 1:1 saamiga stoichiometric, lagu aqoonsaday polymorphism-keeda gaarka ah– dhaaftay 250 noocyo badan oo la yaqaan– Dhammaan waxay wadaagaan curaarta isku-dhafan ee jihada adag laakiin waxay ku kala duwan yihiin isku-darka silsiladaha Si-C.
Mid ka mid ah noocyada ugu habboon ee polytypes waa 3C-SiC (qaabka isku dhafka zinc cubic), iyo noocyada laba geesoodka ah 4H-SiC iyo 6H-SiC, Mid kastaa wuxuu muujinayaa kala duwanaansho daahsoon oo ku jira bandgap, dhaqdhaqaaqa elektarooniga ah, iyo dhaqdhaqaaqa kulaylka ee saameeya ku habboonaantooda codsiyada faahfaahinta.
adkaanta Si– C bond, oo leh tamar dammaanad ah oo qiyaas ah 318 kJ/mol, Waxay taageertaa adkeynta cajiibka ah ee SiC (Mohs adag ee 9– 9.5), arrin dhalaalaysa sare (~ 2700 ° C), iyo iska caabinta burburinta kiimikada iyo shoogga kulaylka.
Taarikada dhoobada ah, Nooca badan waxaa badanaa lagu doortaa iyadoo lagu saleynayo isticmaalka loogu talagalay: 6H-SiC prevails in architectural applications as a result of its convenience of synthesis, while 4H-SiC controls in high-power electronics for its superior fee provider wheelchair.
The broad bandgap (2.9– 3.3 eV waxay kuxirantahay nooca badan) additionally makes SiC an exceptional electric insulator in its pure type, though it can be doped to function as a semiconductor in specialized digital tools.
1.2 Qaab-dhismeed yar iyo nadiifnimada Marxaladda Taarikada dhoobada
The performance of silicon carbide ceramic plates is critically depending on microstructural features such as grain size, dhumucdiisuna, homogeneity marxaladda, and the existence of additional stages or contaminations.
High-grade plates are usually fabricated from submicron or nanoscale SiC powders with sophisticated sintering methods, taasoo keenaysa qallafsanaan, qaab-dhismeedyo yaryar oo cufan oo kor u qaadaya adkaanta farsamada iyo kulaylka.
Wasakhooyinka sida kaarboonka complimentary, silica (SiO TWO), ama caawimada isku dhafka ah sida boron ama aluminium miisaan fudud waa in si fiican loo habeeyo, maadaama ay samayn karaan filimo intergranular ah oo hoos u dhigaya awooda heerkulka sare iyo iska caabinta oksaydhka.
Porosity soo noqnoqda, sidoo kale heerar la dhimay (
Ceramics Advanced la aasaasay Oktoobar 17, 2012, waa shirkad tignoolajiyada sare leh oo ka go'an cilmi-baarista iyo horumarinta, wax soo saarka, farsamaynta, iibinta iyo adeegyada farsamada ee alaabta qaraabada dhoobada ah sida Silicon Carbide Ceramic Plates. Alaabadayada waxaa ku jira laakiin aan ku xaddidnayn Alaabta dhoobada ah ee Boron Carbide, Alaabta dhoobada ee boron Nitride, Alaabta dhoobada ee Silicon Carbide, Alaabta dhoobada ee Silicon Nitride, Alaabta dhoobada ah ee Zirconium Dioxide, iwm. Hadii aad xiisaynayso, fadlan xor u noqo inaad nala soo xidhiidho.
Tags: saxan carbide silicon,saxan carbeed,xaashi carbide silicon
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