1. Crystallography and Material Basics of Silicon Carbide
1.1 Polymorphism and Atomic Bonding in SiC
(Silicon Carbide Ceramic Plates)
Silicon carbide (SiC) is a covalent ceramic substance made up of silicon and carbon atoms in a 1:1 stoichiometric ratio, identified by its exceptional polymorphism– over 250 known polytypes– all sharing solid directional covalent bonds but varying in piling series of Si-C bilayers.
One of the most highly appropriate polytypes are 3C-SiC (cubic zinc blende framework), and the hexagonal kinds 4H-SiC and 6H-SiC, each displaying subtle variations in bandgap, electron mobility, and thermal conductivity that affect their suitability for details applications.
The toughness of the Si– C bond, with a bond energy of roughly 318 kJ / mol, underpins SiC’s remarkable solidity (Mohs hardness ntawm 9– 9.5), siab melting point (~ 2700 °C), and resistance to chemical destruction and thermal shock.
Hauv cov phaj ceramic, the polytype is commonly selected based upon the intended usage: 6H, -.
S (2.9– 3.3 i) C, though it can be doped to function as a semiconductor in specialized digital tools.
1.2 f
e, e, m, thiab qhov muaj ntawm cov theem ntxiv lossis kev sib kis.
n, t, tag nrho cov microstructures ntom nti uas ua rau cov neeg kho tshuab toughness thiab thermal conductivity.
Cov kab mob xws li cov pa roj carbon ntxiv, silica (SiO2), lossis sintering pab xws li boron lossis lub teeb yuag txhuas yuav tsum tau tswj kom zoo, vim tias lawv tuaj yeem tsim cov yeeb yaj kiab intergranular uas txo qis qhov kub thiab oxidation tsis kam.
Rov ua dua porosity, kuj ntawm kev txo qis degrees (
a 17, 2012, b, ntau lawm, C, kev muag khoom thiab kev pabcuam thev naus laus zis ntawm cov khoom siv ceramic-ntsig txog xws li Silicon Carbide Ceramic Plates. Peb cov khoom suav nrog tab sis tsis txwv rau Boron Carbide Ceramic Products, Boron Nitride Ceramic Products, Silicon Carbide Ceramic Products, Silicon Nitride Ceramic Products, Zirconium Dioxide Ceramic Products, v. Yog tias koj txaus siab, thov koj xav tiv tauj peb.
Tags: Silicon Carbide Phaj,Carbide Phaj,Silicon Carbide Sheet
Tag nrho cov ntawv thiab cov duab yog los ntawm Is Taws Nem. Yog tias muaj teeb meem copyright, thov hu rau peb hauv lub sijhawm kom rho tawm.
Nug nrog peb