1. Crystallography ndi Zinthu Zoyambira za Silicon Carbide
1.1 Polymorphism ndi Atomic Bonding mu SiC
(Silicon Carbide Ceramic Plates)
Silicon carbide (SiC) ndi covalent ceramic chinthu chopangidwa ndi silicon ndi ma atomu a kaboni mu a 1:1 chiwerengero cha stoichiometric, chodziwika ndi polymorphism yake yapadera– chatha 250 odziwika polytypes– onse akugawana zomangira zolimba zokhazikika koma zosinthika pakuchulukirachulukira kwa ma Si-C bilayers.
Imodzi mwa ma polytypes oyenera kwambiri ndi 3C-SiC (kiyubiki zinc blende chimango), ndi mitundu ya hexagonal 4H-SiC ndi 6H-SiC, aliyense akuwonetsa kusiyanasiyana kobisika mu bandgap, electron kuyenda, ndi matenthedwe matenthedwe omwe amakhudza kuyenerera kwawo kwa tsatanetsatane wa ntchito.
Kulimba mtima kwa Si– C mgwirizano, ndi chomangira mphamvu pafupifupi 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 kugwedezeka kwa kutentha.
Mu mbale za ceramic, polytype imasankhidwa kawirikawiri kutengera zomwe akufuna: 6H-SiC imapambana muzomangamanga chifukwa cha kuphweka kwake kwa kaphatikizidwe, pomwe 4H-SiC imayang'anira pamagetsi amphamvu kwambiri panjinga yake yama wheelchair.
Gulu lalikulu (2.9– 3.3 eV kutengera polytype) imapangitsanso SiC kukhala insulator yapadera yamagetsi mumtundu wake woyera, ngakhale itha kugwiritsidwa ntchito ngati semiconductor mu zida zapadera za digito.
1.2 Microstructure ndi Stage Purity mu Ceramic Plates
Kuchita kwa mbale za silicon carbide ceramic kumatengera kwambiri mawonekedwe a microstructural monga kukula kwa tirigu, makulidwe, siteji homogeneity, ndi kukhalapo kwa magawo owonjezera kapena kuipitsidwa.
Ma mbale apamwamba nthawi zambiri amapangidwa kuchokera ku ufa wa submicron kapena nanoscale SiC wokhala ndi njira zotsogola., zochititsa manyazi, ma microstructures owonda kwambiri omwe amakulitsa kulimba kwamakina komanso kutenthetsa kwamafuta.
Zoipa monga complimentary carbon, silika (SiO TWO), kapena thandizo la sintering ngati boron kapena aluminiyamu yopepuka yopepuka iyenera kuyendetsedwa bwino, chifukwa amatha kupanga mafilimu a intergranular omwe amachepetsa mphamvu ya kutentha kwambiri komanso kukana kwa okosijeni.
Kubwereza porosity, komanso pa madigiri ochepetsedwa (
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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