1. Material Scientific Research and Structural Stability
1.1 Crystal Chemistry and Bonding Characteristics
(Silicon Carbide Crucibles)
Silicon carbide (SiC) is a covalent ceramic composed of silicon and carbon atoms prepared in a tetrahedral lattice, primarily in hexagonal (4H, 6H) or cubic (3C) polytypes, each showing outstanding atomic bond strength.
The Si– C bond, with a bond power of approximately 318 kJ/mol, is among the strongest in structural porcelains, providing exceptional thermal security, solidity, and resistance to chemical strike.
This durable covalent network causes a material with a melting point going beyond 2700 ° C(sublimes), making it among the most refractory non-oxide porcelains offered for high-temperature applications.
Unlike oxide ceramics such as alumina, SiC preserves mechanical stamina and creep resistance at temperatures above 1400 ° C, where several metals and standard ceramics begin to soften or degrade.
Its low coefficient of thermal growth (~ 4.0 × 10 ⁻⁶/ K) combined with high thermal conductivity (80– 120 W/(m · K)) allows rapid thermal cycling without disastrous breaking, a vital feature for crucible efficiency.
These inherent residential properties originate from the balanced electronegativity and comparable atomic dimensions of silicon and carbon, which advertise a highly secure and largely loaded crystal framework.
1.2 Microstructure and Mechanical Resilience
Silicon carbide crucibles are commonly fabricated from sintered or reaction-bonded SiC powders, with microstructure playing a definitive function in resilience and thermal shock resistance.
Sintered SiC crucibles are produced via solid-state or liquid-phase sintering at temperatures over 2000 ° C, commonly with boron or carbon ingredients to improve densification and grain border cohesion.
This process yields a totally thick, fine-grained structure with marginal porosity (
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 and products. 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 Crucibles, Silicon Carbide Ceramic, Silicon Carbide Ceramic Crucibles
All articles and pictures are from the Internet. If there are any copyright issues, please contact us in time to delete.
Inquiry us