Nitride Bonded Silicon Carbide: Ultimate Toughness for Extreme Conditions

Nitride Bonded Silicon Carbide - Ultimate Toughness for Extreme Conditions

Nitride Bonded Silicon Carbide (NBSC) is an extraordinary material capable of withstanding all sorts of environments. Boasting exceptional thermal, mechanical, and chemical properties that enable it to become an essential component in modern engineering applications.

NBSC refractories offer superior thermal shock resistance, which allows them to retain their strength under extreme conditions. They also feature superior oxidation resistance and can be formed into complex shapes for use in high-temperature furnaces.

Exceptional Thermal Shock Resistance

Nitride-bonded silicon carbide (NBSC) stands out as one of the finest examples of innovation within materials science. This refractory ceramic composite offers superior thermal, mechanical, and chemical properties for industrial applications, setting new benchmarks.

NBSCs are produced through a complex process involving reacting silicon carbide powder with silica powder in an atmosphere rich in nitrogen and at high temperatures, followed by nitridation reactions in which silicon melts into SiC matrix while simultaneously bonding with nitrogen into an extremely durable material.

At 1100-1400degC, thermogravimetry and spatially resolved Raman and SEM analysis was employed to study the oxidation behavior of porous NBSC at temperatures between 1100-1400degC. Results demonstrated that direct nitridation from silica to SiC yields crystalline phases with lower whisker contents and low residual silicon concentration in their matrix structures even at high heating rates - characteristics which make NBSC an excellent thermal shock resistant material suitable for demanding industrial applications.

High Resistance to Corrosion

Silicon Carbide (SiC) is an exceptionally tough material that offers outstanding corrosion resistance in multiple environments. Due to its superior oxidation resistance and chemical inertness, SiC makes for a great choice in environments hostile to other materials.

Reaction bonded silicon carbide features low open porosity and consistent strength across a broad temperature range, making it suitable for casting intricate forms with the Blasch process, while offering desirable refractory and chemical properties.

NBSIC's chemical makeup is determined by combining three Simet+two N2g into Si3N4. This results in a product with higher density than pure silicon carbide sintered under specific conditions, and controlled shrinkage. This allows sintering conditions to be expanded across high densities with superior thermal shock resistance and oxidation resistance; opening up many opportunities for smelting and casting applications such as environments involving gases, slags and coal ash.

Excellent Wear Resistance

Silicon carbide is hard and has an extremely high melting point, providing excellent protection from hard particles and surfaces abrasion. Furthermore, its fracture toughness value ranks as one of the highest among engineering materials.

NB SiC can be formed into complex geometric forms and boasts outstanding refractory and chemical properties, including thermal shock resistance as well as rapid temperature changes.

NB SiC's abrasive wear resistance far outshines that of steel in all soil conditions tested, and up to nine times more intense in heavy and medium soil conditions compared with special steels for soil working parts. Furthermore, its performance compares favorably with padding weld based on Fe-Cr-Nb in 38GSA steel - though note that its wear increases with depth penetration.

Excellent Chemical Resistance

Nitride bonding allows for the combination of silicon carbide's excellent refractory properties with pure Si's chemical resistance, achieved through mixing high-purity SiC powder with low-purity silica powder that is compacted and sintered at elevated temperatures in an atmosphere rich in nitrogen.

This tedious process results in a strong material that can withstand corrosion, mechanical shock and thermal shock while still offering exceptional strength at very high temperatures.

Reaction Bonded Silicon Carbide bricks can be utilized in numerous industrial settings, from side walls of aluminum melting pots and lower stacks of blast furnaces, to being utilized as kiln furniture to reduce energy consumption and free up more space for additional raw materials. Furthermore, their exceptional refractory and chemical resistance enables increased productivity and longer lifespan in demanding environments.