1. Crystallography and Product Principles 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 proportion, differentiated by its remarkable polymorphism– over 250 well-known polytypes– all sharing solid directional covalent bonds but differing in stacking sequences of Si-C bilayers.
The most technologically pertinent polytypes are 3C-SiC (cubic zinc blende structure), and the hexagonal types 4H-SiC and 6H-SiC, each displaying refined variants in bandgap, electron movement, and thermal conductivity that affect their viability for certain applications.
The stamina of the Si– C bond, with a bond power of approximately 318 kJ/mol, underpins SiC’s extraordinary hardness (Mohs solidity of 9– 9.5), high melting point (~ 2700 ° C), and resistance to chemical destruction and thermal shock.
In ceramic plates, the polytype is normally selected based upon the meant usage: 6H-SiC is common in architectural applications because of its simplicity of synthesis, while 4H-SiC controls in high-power electronic devices for its superior fee provider flexibility.
The broad bandgap (2.9– 3.3 eV depending on polytype) additionally makes SiC an exceptional electric insulator in its pure type, though it can be doped to operate as a semiconductor in specialized electronic tools.
1.2 Microstructure and Phase Purity in Ceramic Plates
The efficiency of silicon carbide ceramic plates is seriously dependent on microstructural attributes such as grain dimension, thickness, phase homogeneity, and the presence of additional stages or impurities.
Top notch plates are typically made from submicron or nanoscale SiC powders through advanced sintering strategies, causing fine-grained, fully dense microstructures that make best use of mechanical toughness and thermal conductivity.
Impurities such as cost-free carbon, silica (SiO TWO), or sintering aids like boron or aluminum have to be carefully controlled, as they can form intergranular films that reduce high-temperature strength and oxidation resistance.
Recurring porosity, also at low levels (
Advanced Ceramics founded on October 17, 2012, is a high-tech enterprise committed to the research and development, production, processing, sales and technical services of ceramic relative materials such as Silicon Carbide Ceramic Plates. Our products includes but not limited to Boron Carbide Ceramic Products, Boron Nitride Ceramic Products, Silicon Carbide Ceramic Products, Silicon Nitride Ceramic Products, Zirconium Dioxide Ceramic Products, etc. If you are interested, please feel free to contact us.
Tags: silicon carbide plate,carbide plate,silicon carbide sheet
All articles and pictures are from the Internet. If there are any copyright issues, please contact us in time to delete.
Inquiry us
