nitride bonded silicon carbide is a high-performance technical ceramic that boasts excellent wear resistance and thermal shock resistance, in addition to desirable refractory, chemical, and physical properties that allow it to be formed into intricate shapes using the Blasch process.NBSC also boasts exceptional corrosion resistance against non-ferrous metals such as aluminium and magnesium, making it the ideal material for use in kiln furniture and crucibles.
Good mechanical strength and toughness
nitride bonded silicon carbide is an extremely hard material with one of the highest hardness values among engineering materials, boasting one of the highest hardness values available today. This material offers exceptional resistance against hard particles and surfaces as well as good wear resistance properties, with high inherent strength to withstand extreme temperatures while still resisting creep and corrosion.
This material is commonly utilized as a cast refractory, where complex shapes can be created without grinding. You’ll often find this material used as part of products like cyclone liners designed to withstand mining applications without incurring excessive wear, monolithic linings for process furnaces and kilns as well as metal processing equipment; and also as an ideal material for lining and sealing of ducts in coal plants and oil refineries.
Studies on the abrasive wear resistance of nitride bonded silicon carbide have been conducted under different soil conditions. Results reveal that wear behavior depends on composition of soil grain size distribution; light soil offered superior anti-wear performance than any other condition studied, with better anti-wear performance seen than steels and padding welds in all cases.
As a general rule, wear resistance of nitride-bonded silicon carbide increases with particle size distribution due to larger abrasive grains having greater wear-resistant properties than their smaller counterparts. Conversely, however, its wear resistance decreases due to an increase in silty and dusty fraction of soil as these softer materials may chip off its surface and weaken nitride bonding of silicon carbido surfaces.
Sintering of reaction bonded silicon carbide requires an immense amount of energy. The process typically occurs at high temperature and involves complex technology; its formation process has a great influence on its microstructure; modifications can increase strength while making the ceramic more fracture and crack-resistant; this results in very durable ceramics with high thermal shock resistance.
nitride bonded silicon carbide boasts superior mechanical strength and toughness, but also offers exceptional chemical resistance and high temperature properties. Being inert means it does not react with most acids, molten salts or alkalis; furthermore it remains non-oxidising even at very high temperatures and boasts low coefficient of thermal expansion; making it the ideal material choice for applications exposing it to extreme temperatures or particles of wear and tear.
Nitride-bonded silicon carbide is produced through reaction bonding and sintering processes, with sintering as the defining step affecting its microstructure. It typically begins as finely-grained SiC powder mixed with sintering additives before being sintered at temperatures exceeding 2,000 degrees Celsius to form both a- and b-phase silicon nitride structures; with corner-sharing tetrahedral grains forming compact layers while the latter contains long Si-N bonds interlocked into tight matrix structures.
As a result of its inert nature, nitride bonded silicon carbide has an extremely low coefficient of thermal expansion, making it suitable for applications where other ceramics would fail due to thermal shock or dimensional instability. Furthermore, nitride bonded silicon ranks highly among engineering materials for hardness values as well as wear-resistance from wear particles and surfaces.
nitride bonded silicon carbide increased abrasion resistance due to its low coefficient of friction, which helps minimize impact energy transference. This feature is particularly advantageous when there are large gaps between mating surfaces as the nitride layer can help cushion this contact area and minimize energy transfer during impact.
nitride bonded silicon carbide has an exceptional bending strength that makes it suitable for many industrial applications, from tile and ceramic furnaces, honeycomb firing racks, sheaths and honeycomb kiln furniture to resisting high stress levels caused by heating/cooling cycles. All these benefits make nitride bonded silicon carbide an invaluable component of any manufacturing process.
High thermal shock resistance
Nitride-bonded silicon carbide (NBSC) is an ideal material for high-temperature industrial applications. This composite refractory ceramic features coarse and medium-grained silicon carbide particles bound by either an alumina or silica binder, making it highly resistant to wear and corrosion at very high temperatures while still retaining strength.
NBSC refractories are ideal for high-stress environments subject to thermal shocks, due to their alumina and silica binder which prevents cracks from forming when ceramic under stress. They’re often applied directly onto tunnel and shuttle kiln furnace walls.
Silicon carbide is one of the hardest materials known, retaining its hardness even at high temperatures. Furthermore, it is highly resistant to both abrasion and corrosion; qualities which make it suitable for high-performance pump components that must withstand exposure to aggressive chemicals or abrasive slurries.
Nitride-bonded silicon carbide features excellent thermal conductivity thanks to the presence of alumina and silica particles, meaning it can tolerate extreme thermal stress without deforming or cracking under pressure. This property makes nitride bonded silicon carbide an extremely durable and resilient material suitable for use across a range of industrial applications.
Silicon carbide’s resistance to abrasion and corrosion increases significantly when it’s nitride bonded, making it even more suitable for applications that involve very abrasive materials, like soil. Nitride-bonded silicon carbide has proven its worth over four times faster in heavy soil conditions compared with steel while outlasting its counterpart sixfold for light soil conditions.
Silicon nitride (Si3N4) binder greatly improves the abrasion resistance of nitride-bonded silicon carbide. This composite material can be manufactured through both reactive sintering and spark plasma sintering; while reactive sintering may produce consistent strength/porosity results, spark plasma sintering is typically preferred as its manufacturing technique for this application.
Excellent wear resistance
nitride bonded silicon carbide stands out among engineering materials as one of the top wear-resisting materials, providing it with great wear resistance against hard particles and surfaces. Furthermore, this material’s corrosion-resistance can stand up against acids and alkalis; in addition to being exceptionally stable at higher temperatures.
Nitride-bonded silicon carbide’s superior mechanical strength protects it from fatigue and cracking under heavy loads, while its thermal shock resistance enables rapid temperature changes without cracking or degrading; even temperatures up to 1550degC don’t crack it or degrade its integrity, making this material an invaluable solution in hot environments.
Nitride-bonded silicon carbide (NBSC) composites combine silicon carbide with a silicon nitride binder, providing excellent abrasion and erosion resistance. As an adaptable material with superior chemical and physical properties, this versatile material makes NBSC an excellent choice for use in harsh industrial environments. These composites come in various sizes and grades to meet specific applications – and custom orders can even be produced to suit individual specifications.
Silicon carbide can be formed using two distinct processes, including reaction bonding or sintering, each having an immense effect on its microstructure. Reaction bonded silicon carbide can be produced by gelcasting an aqueous slurry with coarse-grained SiC and fine-grained silicon, while sintering involves high temperature furnaces for completion.
Nitride-bonded silicon carbide’s superior abrasion and erosion resistance helps safeguard sensitive equipment during operation, while its excellent chemical inertness and refractory characteristics make it suitable for various industries – mining, petrochemicals, red metal and monolithic cyclone liners are among them. Furthermore, this material’s resistance to aluminum, zinc, copper and magnesium melt corrosion protects it even further.
nitride bonded silicon carbide stands out in light soil environments for its impressive abrasion resistance. Even loose grains of sand moving freely around a friction surface only scratch it without causing serious damage, while its abrasive resistance almost rivals that of special steels designed for soil working parts.