Silicon Carbide Crucibles: Thermal Stability in Extreme Processing alumina aluminum oxide
1. Product Scientific Research and Structural Integrity
1.1 Crystal Chemistry and Bonding Characteristics
(Silicon Carbide Crucibles)
Silicon carbide (SiC) is a covalent ceramic made up of silicon and carbon atoms arranged in a tetrahedral lattice, mainly in hexagonal (4H, 6H) or cubic (3C) polytypes, each displaying remarkable atomic bond strength.
The Si– C bond, with a bond energy of around 318 kJ/mol, is among the toughest in structural ceramics, giving exceptional thermal stability, hardness, and resistance to chemical attack.
This robust covalent network causes a product with a melting factor surpassing 2700 ° C(sublimes), making it among the most refractory non-oxide porcelains offered for high-temperature applications.
Unlike oxide porcelains such as alumina, SiC preserves mechanical stamina and creep resistance at temperature levels over 1400 ° C, where several steels and traditional porcelains start to soften or break down.
Its reduced coefficient of thermal growth (~ 4.0 × 10 ⁻⁶/ K) combined with high thermal conductivity (80– 120 W/(m · K)) allows rapid thermal cycling without devastating breaking, a crucial characteristic for crucible performance.
These intrinsic homes originate from the balanced electronegativity and similar atomic dimensions of silicon and carbon, which advertise a highly steady and densely packed crystal structure.
1.2 Microstructure and Mechanical Resilience
Silicon carbide crucibles are normally made from sintered or reaction-bonded SiC powders, with microstructure playing a crucial function in toughness and thermal shock resistance.
Sintered SiC crucibles are produced with solid-state or liquid-phase sintering at temperatures over 2000 ° C, frequently with boron or carbon additives to improve densification and grain boundary communication.
This process generates a completely thick, fine-grained framework with very little porosity (
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1. Product Scientific Research and Structural Integrity 1.1 Crystal Chemistry and Bonding Characteristics (Silicon Carbide Crucibles) Silicon carbide (SiC) is a covalent ceramic made up of silicon and carbon atoms arranged in a tetrahedral lattice, mainly in hexagonal (4H, 6H) or cubic (3C) polytypes, each displaying remarkable atomic bond strength. The Si– C bond, with…