nitride bonded silicon carbide is an innovative refractory material offering excellent thermal shock resistance as well as alkali corrosion and oxidation resistance, as well as good slag resistance properties.NBSiC (nitrogen-bonded silicon carbide) is a ceramic material created through reacting silicon powder with nitrogen in the presence of sintering aids like magnesium. Once created, this ceramic can then be pressed and shaped.
Mechanical Strength and Toughness
nitride bonded silicon carbide boasts superior mechanical strength and toughness, being capable of withstanding rapid temperature changes without cracking or fracture. Furthermore, its intrinsic strength, high temperature stability and resistance to creep, oxidation and corrosion make NBSC an ideal material choice for many applications.
NBSC ceramic refractories are highly resistant to thermal shock, making them ideal for use in environments where temperature fluctuations occur frequently or where repeated cycling of heating and cooling must take place. Their low thermal conductivity keeps heat inside their structure ensuring their performance remains unaffected by external temperatures or internal stressors.
Nitride-bonded silicon carbide bricks are constructed using a mixture of coarse and fine granular silica with alumina grains interspersed by nitride layers, before being compressed under high pressure before sintered at temperatures up to 2000degC. This process gives nitride bonded silicon carbide its excellent mechanical properties and superior toughness.
Nitride-bonded silicon carbide boasts exceptional abrasion resistance. Even loose grains of sand traveling freely across its friction surface only scratch it without causing serious damage – in fact, its resistance is comparable to special steels designed specifically for soil working parts.
Nitride-bonded silicon carbide offers outstanding impact strength and resistance to brittle cracking. Furthermore, its resistance to erosion and wear makes it suitable for demanding environments such as mining and tunnelling.
Nitride-bonded silicon carbide has an exceptionally high load carrying capacity, making it suitable for heavy industrial uses such as shear walls and honeycomb kiln furniture construction. Furthermore, its chemical resistance against acids, molten salts and halogens enables it to perform well even in hostile environments where other materials might fail. Nitride bonded silicon carbide comes in various product forms to meet different applications from standard refractory bricks to custom shapes and sizes and its formation process can accommodate semi-dry molding or grouting processes as needed by different applications.
Excellent Thermal Shock Resistance
nitride bonded silicon carbide offers excellent refractory, chemical and thermal shock resistance properties as well as excellent wear-resistance for applications involving abrasive wear. Furthermore, its casting technique makes intricate shapes possible while its mechanical strength ensures reliable use in demanding applications.
Nitride-bonded silicon carbide shares many of the same chemical components with regular silicon carbide, but differs in that its composition includes coarse granules of silicon carbide surrounded by small needle-like grains of silicon nitride with clear interfaces between its phases – creating a composite material from a chemical standpoint even though its behavior at high temperatures remains similar.
Nitride bonded silicon carbide has a very high thermal shock resistance due to the strong bonds formed between nitride and silicon carbide, providing this material with exceptional thermal shock resistance and stress tolerance – it is often employed in situations with sudden temperature changes such as cyclone liners or kiln furniture.
Nitride-bonded silicon carbide can be produced using powder blending, hot pressing or vacuum deposition methods and then pressurised under high pressure before being pressurised into dense material. It can either be produced as green shapes or solid pieces depending on its intended use; both forms feature lower porosity than oxide-bonded silicon carbide materials.
Refractories made from this material have also demonstrated excellent abrasive wear resistance in soil environments that are more abrasive than normal steels, such as earthmoving. Nitride-bonded silicon carbide wore out less intensely than steel working parts used for earthmoving applications and padding weld containing C + Cr + Nb that are frequently employed for this purpose in wear tests on different types of soil types.
Calyco Mining Equipment Supplies utilizes the thermal and abrasion resistant properties of nitride-bonded silicon carbide in various applications across Australia, such as cyclone liners, slurry pump impellers, coal burner, exhaust and pulveriser parts. Furthermore, this material can be found in furnaces and kilns such as sidewalls of aluminium melting pots, lower stacks in blast furnaces, as refractory material in kilns as well as firing non-ferrous metals.
Excellent Corrosion Resistance
nitride bonded silicon carbide exhibits excellent chemical resistance to acids and molten salts. Furthermore, its corrosion resistance extends to chlorine and fluorine-containing substances; in addition, this material boasts relatively high thermal shock resistance so as to withstand rapid temperature fluctuations without cracking or fracture.
Nitride-bonded silicon carbide can be used to form complex shapes not possible with conventional oxide-bonded refractories, and produced using the Blasch process for use in applications requiring superior abrasion and erosion resistance without incurring more costly, dense advanced ceramic costs.
Nitrogen-bonded silicon carbide is widely utilized in the aluminium industry furnaces as cast refractory parts, such as sidewalls of melting pots and lower stacks of blast furnaces. Furthermore, this material serves as kiln furniture in shaft furnaces to facilitate melting cathode copper cathodes; and other industrial processes and equipment use nitrogen-bonded silicon carbide such as cyclones for wear-resistant wear in mineral plants as well as coal plant equipment and slurry pump components.
Silcarb offers various grades of NBSIC that boast outstanding erosion and corrosion resistance, with its ALTRON grades offering outstanding oxidation and corrosion resistance at elevated temperatures. ALTRON was specifically created to compete with more expensive fully dense advanced ceramic materials; their cost may not justify themselves or they could crack under rapid temperature change, making ALTRON an attractive alternative.
Recent research conducted on the abrasive wear performance of nitride bonded silicon carbide in various soil conditions demonstrated its superiority over both boron steel and refractory grade silicon carbide; light soil provided the optimal conditions. Wear resistance was much higher with NBSIC than with padding weld of refractory grade silicon carbide and more than eight times greater than that seen with XAR 600 steel.
It was found that the abrasive wear resistance of NBSIC refractories varied depending on the size of soil particles that they needed to cut through abrasively, with wear being 1.5-2 times greater than with steel-refractories and eight times higher than pad weld refractory grade silicone carbides (RGSCs).
Excellent Wear Resistance
nitride bonded silicon carbide offers exceptional wear resistance against impact and sliding abrasion, as well as resistance against brittle cracking. This makes it the perfect material to use at elevated temperatures with liquid metals such as aluminium, copper, zinc or steel that have extreme temperatures of expansion or contraction.
Nitric acid corrosion is another challenge that nitride bonded silicon carbide can help you address, as its extraordinary corrosion-resistance is unparalleled among synthetic materials with its Mohs hardness rating of 9, which approaches that of diamond.
Nitride-bonded silicon carbide’s performance when exposed to abrasive wear depends heavily on its grain size distribution in soil. When placed in light soil conditions, its performance surpasses steel and padding weld significantly; in medium and heavy soil however, performance decreases because finer particles like silt and dust wear away at its edges faster.
Reaction-bonded silicon carbide is widely utilized in mining and other industrial equipment due to its exceptional wear, impact and thermal shock resistance. Furthermore, it is highly resistant to oxidation with very good chemical properties, casting very intricate shapes with excellent accuracy and quality surface finish; and can even be made into large complex engineered pieces normally constructed from metal alloys such as stainless steel.
nitride bonded silicon carbide components also can be used at mining and other industrial facilities in the form of cyclone liners, slurry pump impellers, coal burners, exhaust and pulveriser parts, corrosion resistant components as well as wear-resistant parts for coal burners and exhaust and pulverisers. Fiber-reinforced plastic (FRP) materials have been shown to increase component lives two to twenty times over metal and rubber materials, and are frequently used as furniture components in kilns, particularly on sidewalls of aluminium melting pots and lower stacks of blast furnaces. Additionally, FRP has become an attractive material choice for kiln furniture construction – in particular sidewalls of melting pots for aluminium melting applications and in lower stacks for blast furnaces. nitride bonded silicon carbide can withstand temperatures up to 1550 degC and is an extremely durable material, resistant to corrosion and mechanical loads. Additionally, its flexural strength exceeds that of regular refractory ceramic and it has the capability of transferring lateral loads.