1. Criostalagrafaíocht agus Prionsabail Ábhar Carbide Sileacain
1.1 Polymorphism agus Nascáil Adamhach i SiC
(Plátaí Ceirmeacha Silicon Carbide)
Comhdhúile sileacain (SiC) is a covalent ceramic compound made up of silicon and carbon atoms in a 1:1 stoichiometric proportion, distinguished by its amazing polymorphism– thar 250 polytypes-aitheanta go maith– 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), agus na cineálacha heicseagánacha 4H-SiC agus 6H-SiC, each showing refined variations in bandgap, electron flexibility, and thermal conductivity that influence their viability for particular applications.
An déine an Si– C banna, with a bond power of around 318 kJ/mol, underpins SiC’s phenomenal firmness (Mohs daingne 9– 9.5), fachtóir leá ard (~ 2700 °C), and resistance to chemical degradation and thermal shock.
I plátaí ceirmeacha, 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.
An bandgap mór (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 Micreastruchtúr agus Íonacht Chéim i bPlátaí Ceirmeacha
The efficiency of silicon carbide ceramic plates is critically dependent on microstructural attributes such as grain dimension, tiús, aonchineálacht stáitse, and the visibility of secondary stages or impurities.
High-grade plates are usually fabricated from submicron or nanoscale SiC powders via advanced sintering methods, is cúis le mín-grained, completely dense microstructures that optimize mechanical strength and thermal conductivity.
Pollutants such as complimentary carbon, shilice (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 (
Bunaíodh Ardcheirmeacht i mí Dheireadh Fómhair 17, 2012, Is fiontar ardteicneolaíochta tiomanta do thaighde agus forbairt, táirgeadh, próiseáil, díolacháin agus seirbhísí teicniúla ábhair choibhneasta ceirmeacha ar nós Plátaí Ceirmeacha Silicon Carbide. Áirítear ar ár gcuid táirgí ach gan a bheith teoranta do Tháirgí Ceirmeacha Bórón Carbide, Táirgí Ceirmeacha Nítríde Bórón, Táirgí Ceirmeacha Silicon Carbide, Táirgí Ceirmeacha Nítríde Sileacain, Táirgí Ceirmeacha Dé-ocsaíd Siorcóiniam, srl. Má tá suim agat, bíodh leisce ort teagmháil a dhéanamh linn.
Clibeanna: pláta chomhdhúile sileacain,pláta chomhdhúile,bileog chomhdhúile sileacain
Tá gach alt agus pictiúr ón Idirlíon. Má tá aon saincheisteanna cóipchirt, déan teagmháil linn le do thoil in am a scriosadh.
Fiosraigh sinn