1. Crystallography uye Material Basics yeSilicon Carbide
1.1 Polymorphism uye Atomic Bonding muSiC
(Silicon Carbide Ceramic Plates)
Silicon carbide (SiC) chinhu chakabatana checeramic chinogadzirwa nesilicon uye kabhoni maatomu mu a 1:1 stoichiometric ratio, inozivikanwa neyo yakasarudzika polymorphism– pamusoro 250 anozivikanwa polytypes– ese achigovana akasimba anotungamira covalent zvisungo asi achisiyana mukuputira akatevedzana eSi-C bilayers.
Imwe yemapolytypes akakodzera zvakanyanya ndeye 3C-SiC (cubic zinc blende framework), uye ane hexagonal marudzi 4H-SiC uye 6H-SiC, imwe neimwe inoratidza misiyano isina kujeka mubhendigap, electron kufamba, uye thermal conductivity inokanganisa kukodzera kwavo kune ruzivo rwekushandisa.
Kuoma kweSi– C bond, ine bond simba re roughly 318 kJ/mol, inosimbisa kusimba kunoshamisa kweSiC (Mohs kusimba kwe9– 9.5), high melting factor (~ 2700 °C), uye kurwisana nekuparadzwa kwemakemikari uye kupisa kwekushisa.
Mumahwendefa eceramic, iyo polytype inowanzosarudzwa zvichibva pane yainoda kushandiswa: 6H-SiC inokunda mumashandisirwo ezvivakwa nekuda kwekureruka kwayo kwekubatanidza, while 4H-SiC controls in high-power electronics for its superior fee provider wheelchair.
The broad bandgap (2.9– 3.3 eV zvichienderana ne polytype) 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 Microstructure uye Stage Kuchena muCeramic Plates
The performance of silicon carbide ceramic plates is critically depending on microstructural features such as grain size, ukobvu, danho homogeneity, and the existence of additional stages or contaminations.
High-grade plates are usually fabricated from submicron or nanoscale SiC powders with sophisticated sintering methods, zvichiita kuti zvive zvakanaka, totally dense microstructures that maximize mechanical toughness and thermal conductivity.
Contaminations such as complimentary carbon, silica (SiO TWO), or sintering help like boron or light weight aluminum have to be thoroughly regulated, sezvo ivo vachigona kuumba intergranular mafirimu anodzikisa yakakwirira-tembiricha stamina uye oxidation kuramba.
Kudzokorora porosity, zvakare pamadhigirii akaderedzwa (
Yepamberi Ceramics yakavambwa muna Gumiguru 17, 2012, ibhizimusi repamusoro-soro rakazvipira mukutsvagisa nekusimudzira, production, processing, kutengesa uye hunyanzvi masevhisi eceramic hama zvinhu zvakaita seSilicon Carbide Ceramic Plates. Zvigadzirwa zvedu zvinosanganisira asi zvisingagumire kuBoron Carbide Ceramic Zvigadzirwa, Boron Nitride Ceramic Zvigadzirwa, Silicon Carbide Ceramic Zvigadzirwa, Silicon Nitride Ceramic Zvigadzirwa, Zirconium Dioxide Ceramic Zvigadzirwa, etc. Kana uchifarira, ndapota inzwa wakasununguka kutibata nesu.
Tags: silicon carbide ndiro,carbide ndiro,silicon carbide sheet
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