1. Crystallography ndi Mfundo Zazida za Silicon Carbide
1.1 Polymorphism ndi Atomic Bonding mu SiC
(Silicon Carbide Ceramic Plates)
Silicon carbide (SiC) ndi covalent ceramic pawiri wopangidwa ndi silicon ndi maatomu a carbon mu a 1:1 gawo la stoichiometric, chosiyana ndi polymorphism yake yodabwitsa– chatha 250 odziwika bwino polytypes– onse akugawana zomangira zamphamvu zowongolera koma zosiyana pakusunga ma Si-C bilayers.
Imodzi mwa mitundu yofunikira kwambiri paukadaulo ndi 3C-SiC (kiyubiki zinc blende kapangidwe), ndi mitundu ya hexagonal 4H-SiC ndi 6H-SiC, aliyense akuwonetsa kusiyanasiyana kosinthika mu bandgap, electron kusinthasintha, ndi matenthedwe madutsidwe omwe amakhudza kuthekera kwawo pazinthu zinazake.
Kulimba mtima kwa Si– C mgwirizano, ndi mphamvu yomangira mozungulira 318 kJ/mol, imathandizira kulimba kodabwitsa kwa SiC (Kulimba kwa Mohs 9– 9.5), high melting factor (~ 2700 °C), ndi kukana kuwonongeka kwa mankhwala ndi kutentha kwa kutentha.
Mu mbale za ceramic, polytype nthawi zambiri imasankhidwa kutengera zomwe zimagwiritsidwa ntchito: 6H-SiC imapambana muzomangamanga chifukwa chosavuta kaphatikizidwe, pomwe 4H-SiC imayang'anira zamagetsi zamphamvu kwambiri chifukwa cha kusinthasintha kwake konyamula.
Gulu lalikulu (2.9– 3.3 eV kutengera polytype) imapangitsanso SiC kukhala insulator yabwino kwambiri yamagetsi mu mawonekedwe ake oyera, ngakhale itha kupangidwa kuti igwire ntchito ngati semiconductor mu zida zapadera zamagetsi.
1.2 Microstructure ndi Stage Purity mu Ceramic Plates
Kuchita bwino kwa mbale za silicon carbide ceramic kumadalira kwambiri mawonekedwe a microstructural monga kukula kwambewu., makulidwe, siteji homogeneity, ndi kuwonekera kwa magawo achiwiri kapena zonyansa.
Ma mbale apamwamba nthawi zambiri amapangidwa kuchokera ku submicron kapena nanoscale SiC powders pogwiritsa ntchito njira zapamwamba za sintering., zochititsa manyazi, kwathunthu wandiweyani microstructures kuti konza mphamvu mawotchi ndi matenthedwe madutsidwe.
Zowononga zinthu monga carbon complimentary, silika (SiO ₂), kapena thandizo la sintering ngati boron kapena aluminiyamu liyenera kuyang'aniridwa mosamala, monga amatha kupanga mafilimu amtundu wa intergranular omwe amachepetsa mphamvu zotentha kwambiri komanso kukana kwa okosijeni.
Zotsalira porosity, ngakhale pamilingo yotsika (
Advanced Ceramics idakhazikitsidwa pa Okutobala 17, 2012, ndi bizinesi yapamwamba yodzipereka ku kafukufuku ndi chitukuko, kupanga, kukonza, malonda ndi ntchito zaukadaulo za zida za ceramic monga Silicon Carbide Ceramic Plates. Zogulitsa zathu zikuphatikiza, koma osati zokha za Boron Carbide Ceramic Products, Boron Nitride Ceramic Products, Silicon Carbide Ceramic Products, Silicon Nitride Ceramic Products, Zirconium Dioxide Ceramic Products, ndi zina. Ngati muli ndi chidwi, chonde omasuka kulankhula nafe.
Tags: mbale ya silicon carbide,mbale ya carbide,pepala la silicon carbide
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