1. Crystallography uye Material Nheyo dzeSilicon Carbide
1.1 Polymorphism uye Atomic Bonding muSiC
(Silicon Carbide Ceramic Plates)
Silicon carbide (SiC) icovalent ceramic compound yakagadzirwa nesilicon uye carbon atomu mu a 1:1 stoichiometric chikamu, inosiyaniswa neiyo inoshamisa polymorphism– pamusoro 250 anozivikanwa polytypes– ese anogovana akasimba anotungamira covalent zvisungo asi achisiyana mukurongedza akateedzana eSi-C bilayers.
Imwe yeakanyanya tekinoroji yakakosha polytypes ndeye 3C-SiC (cubic zinc blende chimiro), uye ane hexagonal marudzi 4H-SiC uye 6H-SiC, imwe neimwe ichiratidza misiyano yakanatswa mubhendigap, electron flexibility, uye thermal conductivity inokanganisa kugona kwavo kune mamwe maapplication.
Kuoma kweSi– C bond, ine bond simba rekutenderera 318 kJ/mol, inosimbisa SiC's phenomenal kusimba (Mohs kusimba kwe9– 9.5), high melting factor (~ 2700 °C), uye kurwisana nekuparara kwemakemikari uye kupisa kwekushisa.
Mumahwendefa eceramic, iyo polytype inowanzosarudzwa zvichienderana nekushandiswa kunoreva: 6H-SiC inokunda mumashandisirwo ekuvaka nekuda kwekureruka kwayo kwekubatanidza, nepo 4H-SiC inotonga mune yakakwirira-simba zvemagetsi kune yayo yakasarudzika mubhadharo mutakuri kuchinjika..
Bandgap yakakura (2.9– 3.3 eV zvichienderana ne polytype) zvakare inoita SiC yakanakisa magetsi insulator mune yayo yakachena fomu, kunyangwe inogona kuitwa doped kushanda semiconductor mune akasarudzika emagetsi maturusi.
1.2 Microstructure uye Stage Kuchena muCeramic Plates
Kushanda kwesilicon carbide ceramic plates kunoenderana zvakanyanya neiyo microstructural hunhu hwakaita sezviyo dimension., ukobvu, danho homogeneity, uye kuonekwa kwematanho echipiri kana tsvina.
Mahwendefa epamusoro-giredhi anowanzo kugadzirwa kubva kune submicron kana nanoscale SiC poda kuburikidza nemhando yepamusoro sintering nzira., zvichiita kuti zvive zvakanaka, zvachose dense microstructures iyo inokwidziridza simba remakanika uye yekupisa conductivity.
Zvinosvibisa senge complimentary kabhoni, silica (SiO ₂), kana sintering rubatsiro senge boron kana aruminiyamu inofanira kunyatsodzorwa, sezvo vachigona kuumba intergranular mafirimu anoderedza yakakwirira-tembiricha simba uye oxidation kuramba.
Residual porosity, kunyange pamazinga akaderera (
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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