nitride bonded silicon carbide

Nitride Bonded Silicon Carbide

Nitride-bonded silicon carbide (NB SiC) is an advanced refractory material with numerous outstanding properties. It maintains its strength even at elevated temperatures while resisting creep, corrosion and oxidation effectively.

Resistance to abrasive wear depends on the distribution of soil grains; light soil provides optimal results.

Excellent Wear Resistance

Nitride-bonded silicon carbide stands out among engineering materials as having one of the highest wear resistances, thanks to its hardness making it highly resistant to abrasion from hard particles and surfaces, while its nitride bond gives it superior fracture toughness and resistance against brittle cracking - qualities which make this material suitable for most industrial applications with their demanding pressures and temperatures.

Nitride-bonded refractories are frequently utilized in high temperature applications, particularly on blast furnace side walls and lower stacks, waste incinerator plants, and waste incineration facilities. Their characteristics include excellent wear resistance, low linear expansion rate, thermal conductivity properties that exceed those found elsewhere, wet resistance against nonferrous metal melts such as copper and excellent wear resistance properties.

Nitride-bonded silicon carbide shows excellent abrasive wear resistance depending on its soil mass grain size distribution, with light soil providing optimal anti-wear properties - the abrasion intensity was eight times lower than steels with similar niobium contents (F-61, B27 and XAR 600).

Reaction bonded silicon carbide bricks can be cast using the Blasch process and boast many desirable refractory and chemical properties, including excellent wear resistance and resistance to alkali melts such as zinc, aluminum and copper. They also exhibit excellent oxidation resistance as well as thermal shock tolerance.

High Thermal Conductivity

Nitride-bonded silicon carbide ceramics offer excellent thermal conductivity, which allows them to effectively and efficiently transmit heat, making them an excellent material for use in smelting nonferrous metals like Aluminum, Copper and Zinc. Furthermore, this type of ceramic has excellent corrosion and erosion resistance - an added advantage in this application.

Nitride-bonded silicon carbide was subjected to extensive wear resistance testing across a range of soil conditions using the "spinning bowl" test stand, with results demonstrating its reduced wear intensity compared to special steels designed as working parts for soil mass. This was especially evident in light soil where its wear index was nine times less intense than 38GSA steel and 1.36 times lower than boron steel working parts.

NBSIC is a refractory made by sintering reaction-bonded silicon nitride powder (SRBSN) [1]. This process combines SiC powder with ammonia as the nitrogen-containing compound and heating at high temperatures in a nitrogen-rich atmosphere to form reaction-bonded silicon nitride matrixes with superior thermal conductivity and mechanical strength than that produced from conventional sintering, creating ceramics with lower thermal conductivity and reduced vapor pressure - an ideal combination for use in gas-based aluminium melting furnaces [2.].

Chemically Inert

Silicon nitride's hardness and strength make it an excellent material for protecting metals from wear and tear. Furthermore, its corrosion-resistance makes it perfect for chemical processing, semiconductor manufacturing and aerospace. Furthermore, its excellent mechanical properties combined with resistance against oxidation make nitride bonded silicon carbide an ideal refractory ceramic suitable for demanding environments.

Nitride-bonded silicon carbide's resistance to oxidation and corrosion stems from its formation as a matrix of different silicon nitride phases that form a binding matrix, preventing silicon carbide grains from being sintered together and providing high permeability refractories ceramics with higher temperature resistance than sintered versions. Nitride-bonded silicon carbide can therefore be used in environments subjected to higher levels of oxygen oxidation than its sintered counterpart, making it well suited for applications including aerospace applications as well as applications involving higher temperature environments than sintered ones.

Corrosion-resistant nitride-bonded silicon carbide can be produced through reacting porous silicon carbide preforms with liquid silicon through the highly exothermic process of 3 Simet + 2 N2(g). The resultant ceramic boasts improved erosion, chemical and thermal shock resistance over conventional sintered silicon carbide products.

Nitrogen bonded silicon carbide can be found as a cast refractory in various process furnaces and kilns, including side walls of aluminum melting pots, blast furnace stacks and furniture of kilns; additionally it may be employed as shaft furnace refractories when melting cathode copper cathodes.

Corrosion Resistant

Nitride-bonded silicon carbide (NB SiC) has proven itself highly resistant to corrosion in complex environments, while maintaining mechanical strength and structural ability under extreme temperature conditions. This is due primarily to its nitride ceramic phase which inhibits silicon carbide particles reacting directly with oxygen or other chemical species present in complex atmospheres.

NB SiC is extremely resistant to thermal shock and rapid temperature changes without cracking or fracturing, making it suitable for use in high-temperature applications such as steel melting furnaces or kiln furniture. Furthermore, its silicon nitride phase acts as an excellent barrier against oxygen diffusion that could otherwise cause the silicon carbide particles to oxidize over time.

Nitride-bonded silicon carbide's wear resistance depends on the nature and density of the soil mass being worked; in light soils it wears less intensively than XAR 600 steel; in medium and heavy soils it wears as little as the top layer of padding weld made from 38GSA steel or C + Cr + Nb padding welds.