Nitride Bonded Silicon Carbide

Nitride-bonded silicon carbide (NBSIC) refractory brick material offers superior thermal shock resistance, alkali erosion resistance and slag resistance as well as outstanding chemical resistance against zinc, copper, aluminum and lead melts.

Anti-wear performance of NBSIC particles varies with soil conditions, producing optimal results in light to medium conditions. Their particles feature small relatively isometric grains with needle-like crystals.

High-Temperature Strength

Nitride-bonded silicon carbide boasts one of the highest strength-to-weight ratios among engineering materials and one of the highest abrasion resistance ratings, making it an excellent combination between mechanical strength and wear resistance. This material can withstand wear from hard particles or surfaces such as mining and coal plants; commonly used to reproduce metal parts under severe service conditions; examples include cyclone liners for mining/coal plants; pump components; valve linings; spigots/nozzles etc.

NBSiC is produced through the process of nitridation, in which silicon carbide powder and nitrogen-containing compounds such as silica nitride or ammonia are mixed and heated at high temperatures under nitrogen-rich environments to form SiC grains that bond together by reacting with the nitrogen to form silicon nitride phase that forms dense and durable composite materials.

NBSiC can withstand rapid temperature changes without cracking or fracturing, and boasts excellent chemical resistance against acids and molten salts, while being resistant to corrosion by nonferrous metals and oxidizing agents like halides.

Thermal Shock Resistance

Nitride-bonded silicon carbide boasts excellent thermal shock resistance, meaning that it can withstand rapid temperature changes without cracking or shattering. This quality stems from its formation via nitridation; during which, nitrogen reacts with silicon in an elevated-temperature environment to form this compound material.

Nitrogen reacts with silicon in SiC grains to form a silicon nitride phase, bonding them together and creating a strong composite material. Furthermore, this phase also makes the material more resistant to creep, oxidation, and corrosion at elevated temperatures.

Silcarb offers an expansive line of nitride-bonded silicon carbide products in various shapes, sizes and geometries for use in kiln furniture. These materials boast outstanding hot strength, good oxidation/alkali resistance as well as strong erosion resistance in molten metals such as aluminium, zinc and lead; good bending strength/scour resistance/low coefficient of friction properties with excellent hot strength ratings that withstand severe impacts from hard particles or surfaces.

Chemical Resistance

Nitride-bonded silicon carbide has long been revered for its chemical resistance. It can withstand an array of chemicals such as sulfuric acid and phosphoric acid without succumbing to corrosion; additionally it can withstand molten salts or metal melts without incurring significant damage.

Nitride-bonded silicon carbide has been investigated extensively across a range of environments. Studies have revealed its exceptional corrosion and thermal shock resistance, in addition to high strength and abrasion resistance.

Nitride-bonded silicon carbide can be formed into intricate shapes using the Blasch process and boasts desirable refractory and chemical properties. It can be used as a suitable replacement for alloys and refractory materials in extreme service conditions such as mining operations, coal plants and chemical industries requiring cyclone liners; alternatively cast refractories may also be applied as valve liners, spigots or nozzles in equipment and structures like valve liners, spigots or nozzles; in abrasive wear tests it performed admirably, outperforming boron steel and Fe-Cr-Nb padding weld; while nearly three times better than XAR 600 steel and eight times better than B27 steel when exposed to heavy soil conditions!

Wear Resistance

Nitride-bonded silicon carbide (NBSIC) boasts superior mechanical and thermal strength, as well as being highly resistant to wear. NBSIC can be produced in various forms with differing compositions and grain sizes depending on its use in various applications.

Nitride-bonded silicon carbide excelled in all soil conditions tested for wear tests, with significantly lower wear than boron steel or stainless steel in terms of abrasive wear tests. Wear intensity was less intensive in medium and heavy soil than with either XAR 600 steel or B27 boron steel while three times lower than with F-61 padding welds.

Nitride ceramic phases form a protective shield between SiC grains, offering exceptional wear resistance and corrosion resistance. Nitride-bonded silicon carbide is well-suited for many applications including thermocouple protection from high temperature environments as well as offering corrosion resistance against acids, alkalis, molten metals and slag corrosion resistance as well as complex and precise shapes made possible using Blasch process molding technology – qualities which make it a popular choice in iron making blast furnaces such as their lower stack and belly regions.

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