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 set up in a tetrahedral lattice, primarily in hexagonal (4H, 6H) or cubic (3C) polytypes, each showing phenomenal atomic bond strength.
The Si– C bond, with a bond energy of approximately 318 kJ/mol, is amongst the greatest in architectural porcelains, giving exceptional thermal security, firmness, and resistance to chemical attack.
This durable covalent network leads to a product with a melting factor surpassing 2700 Ā° C(sublimes), making it one of one of the most refractory non-oxide porcelains offered for high-temperature applications.
Unlike oxide ceramics such as alumina, SiC maintains mechanical stamina and creep resistance at temperatures over 1400 Ā° C, where numerous metals and conventional ceramics begin to soften or weaken.
Its reduced coefficient of thermal development (~ 4.0 Ć 10 ā»ā¶/ K) integrated with high thermal conductivity (80– 120 W/(m Ā· K)) allows fast thermal cycling without devastating splitting, a crucial feature for crucible performance.
These innate residential or commercial properties stem from the balanced electronegativity and comparable atomic dimensions of silicon and carbon, which advertise a very steady and densely packed crystal framework.
1.2 Microstructure and Mechanical Durability
Silicon carbide crucibles are commonly made from sintered or reaction-bonded SiC powders, with microstructure playing a definitive function in sturdiness and thermal shock resistance.
Sintered SiC crucibles are created with solid-state or liquid-phase sintering at temperatures over 2000 Ā° C, commonly with boron or carbon additives to enhance densification and grain boundary communication.
This process generates a fully 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