1. Kristalografi ak Prensip Materyèl nan Silisyòm Carbide
1.1 Polimòfis ak lyezon atomik nan SiC
(Silisyòm Carbide Plak seramik)
Silisyòm carbure (SiC) is a covalent ceramic compound made up of silicon and carbon atoms in a 1:1 stoichiometric proportion, distinguished by its amazing polymorphism– sou 250 well-known polytypes– all sharing strong directional covalent bonds but varying in stacking series of Si-C bilayers.
One of the most technologically relevant polytypes are 3C-SiC (cubic zinc blende structure), ak kalite egzagonal 4H-SiC ak 6H-SiC, each showing refined variations in bandgap, electron flexibility, and thermal conductivity that influence their viability for particular applications.
Severite a nan Si la– C kosyon, with a bond power of around 318 kJ/mol, underpins SiC’s phenomenal firmness (Mohs solidite nan 9– 9.5), gwo faktè k ap fonn (~ 2700 °C), and resistance to chemical degradation and thermal shock.
Nan plak seramik, the polytype is generally selected based upon the meant use: 6H-SiC prevails in architectural applications due to its ease of synthesis, while 4H-SiC dominates in high-power electronics for its exceptional fee carrier flexibility.
Gwo bandgap la (2.9– 3.3 eV depending upon polytype) also makes SiC an excellent electrical insulator in its pure form, though it can be doped to function as a semiconductor in specialized electronic tools.
1.2 Mikwostrikti ak Etap Pite nan Plak seramik
The efficiency of silicon carbide ceramic plates is critically dependent on microstructural attributes such as grain dimension, epesè, etap omojèn, and the visibility of secondary stages or impurities.
High-grade plates are usually fabricated from submicron or nanoscale SiC powders via advanced sintering methods, sa ki lakòz amann grenn, completely dense microstructures that optimize mechanical strength and thermal conductivity.
Pollutants such as complimentary carbon, silica (SiO ₂), or sintering help like boron or aluminum have to be carefully controlled, as they can form intergranular movies that decrease high-temperature strength and oxidation resistance.
Residual porosity, even at low levels (
Seramik avanse te fonde nan mwa Oktòb 17, 2012, se yon antrepriz gwo teknoloji angaje nan rechèch la ak devlopman, pwodiksyon, pwosesis, lavant ak sèvis teknik nan materyèl relatif seramik tankou Silisyòm Carbide Ceramic Plak. Pwodwi nou yo gen ladan men se pa sa sèlman Boron Carbide seramik pwodwi yo, Bore Nitrure pwodwi seramik, Silisyòm Carbide seramik pwodwi yo, Silisyòm Nitrure pwodwi seramik, Zikonyòm dyosid pwodwi seramik, elatriye. Si w enterese, tanpri ou lib pou kontakte nou.
Tags: plak carbure Silisyòm,plak carbure,fèy carbure Silisyòm
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