Nitridkötésű szilíciumkarbid

Nitride-bonded silicon carbide boasts one of the highest hardness values among engineering materials and exhibits remarkable wear resistance, as well as outstanding abrasion and impact resistance.

NSiC can be purchased as batt, tube and burner nozzle products as well as special shape products. With superior refractory properties as well as high oxidation and corrosion resistance properties, NSiC is well suited to applications requiring high operating temperatures.

Characteristics

Nitride-bonded silicon carbide (NiCrCa) is an industrial ceramic composite material with numerous desirable properties that makes it suitable for many different industries. These include high thermal shock resistance, strength and toughness as well as corrosion and wear/impact resistance as well as low melting point. Furthermore, this substance features excellent chemical stability resulting in great chemical stability with very little melting point variation over time.

NBSiC is typically produced using in-situ reaction bonding with various bonding agents such as mullite, cordierite, silica and glass phase; this process is known as in-situ reaction synthesis (ISRS). ISRS is an efficient and cost-effective method for producing porous SiC ceramics with customizable characteristics; when combined with bonding agents it produces crystalline structures with greater temperature resistance than sintered silicon carbide.

NBSiC can be produced at much lower temperatures than traditional manufacturing techniques, enabling it to be formed at much more cost-efficiently and in more shapes and sizes than before. With superior mechanical strength and impact resistance properties, NBSiC makes an excellent choice for applications involving high loads or velocity; chemically inert properties make it suitable against acids and alkalis alike.

NBSiC’s wear resistance depends on the nature of soil it’s used in; in light soils with loose grains of sand moving freely tend to scratch friction surfaces; however, heavy soils with fixed abrasive grains provide superior wear resistance compared with special steels designed for working parts in soil mass environments; three times less intense wear can be found than with boron steel and C + Cr Nb padding weld materials.

NBSiC boasts incredible durability and is resistant to erosion, making it the ideal material for high-temperature applications like launders and degassing rotors. Furthermore, NBSiC can be cast into complex engineered pieces for equipment used for processing raw materials like Carbofrax ARC and Advancal aluminium reduction cell material. Furthermore, this metal can withstand the effects of molten metal transfer in high temperature applications.

Alkalmazások

Nitride-bonded silicon carbide can be found in applications requiring high wear resistance and corrosion resistance. With one of the highest hardness values among engineering materials, this material can withstand large particles generated through wear abrasion. These materials also boast low coefficients of friction, helping reduce energy requirements to overcome surface contact while decreasing potential for damage. Furthermore, they’re resistant to oxidation and corrosion even at elevated temperatures. Refractory material with superior abrasion and erosion resistance makes a good choice for furnace linings and kiln furniture. Furthermore, its superior protection from oxidation and corrosion extends sensor lifespan.

Reaction bonded silicon carbide (RBSC) is an advanced ceramic refractory material created through an intricate manufacturing process. This involves infiltrating molten silicon into porous carbon packed in the desired product shape before firing it in an oxygen-rich environment at high temperatures to form silicon nitride which bonds SiC grains together.

Studies on the abrasive wear behavior of Nitride-Bonded Silicon Carbide (NBSiC) were performed with three soil types: Loamy Sand, Light Loam and Ordinary Loam. Results demonstrated that its wear resistance depends on its environment; in light soil it was approximately 1.2 times greater than XAR 600 steel in terms of resistance; its resistance increased 1.5 times further when in medium soil while being more than eight times greater in heavy soil conditions.

Cast NBSiC from Refrax is chemically inert to most materials and has outstanding erosion resistance, with high hardness manufacturing methods permitting it to be formed into various shapes. Used primarily in launders and degassing rotors; also utilised in sidewall blocks of aluminium reduction cells; used to protect thermocouple tubes against thermal shock and corrosion as sidewall blocks in aluminium reduction cells and as sidewall blocks protecting thermocouples tubes against thermal shock and corrosion – even against non-ferrous metals! Cast NBSiC also features high hardness manufacturing methods which allow molding into many shapes which further extends its versatility as an refractory application; used widely within launders and degassing rotors while degassing rotors use is used against this metal when used against non-ferrous metals when used sidewall blocks protect thermocouples from thermal shock and corrosion while being resistant against non ferrous metals when used sidewall blocks on aluminium reduction cells sidewall blocks used sidewall blocks used sidewall blocks used sidewall blocks used sidewall blocks used sidewall blocks used sidewall blocks used to sidewall blocks used sidewall blocks in aluminium reduction cells used sidewall blocks used sidewall blocks sidewall blocks used sidewall blocks used sidewall blocks were sidewall blocks used sidewall blocks used sidewall blocks were sidewall blocks used sidewall blocks used as sidewall blocks used as sidewall blocks used sidewall blocks were utilized sidewall blocks also used as sidewall blocks while protecting thermocouple tubes while providing thermocouple sensors from thermal shock or corrosion while also being resistant and being wetting by non ferrous metal reduction cells sidewall cells as sidewall blocks by sidewall cells were utilized reformed with aluminium reduction cells as sidewall blocks re use as sidewall blocks en aluminium cells used. abrasion resistant for sidewall cells as sidewall blocks used sidewall blocks used sidewall blocks used sidewall blocks as sidewall blocks from sidewall cells used sidewall blocks used sidewall blocks used sidewall blocks used sidewall blocks used sidewall blocks protected sensor sensors from thermal shock or protection for thermocouple tubes from thermal shock or corrosion protection. Also providing sensor from thermal shock as protection from wetting by non ferrous metals from wetting as sidewall blocks while acting against thermal shock/corro.

Properties

Nitride-bonded silicon carbide (NBSiC) is a high-temperature material known for its excellent wear resistance, high corrosion and alkali erosion resistance, rugged durability under heavy loads and impacts, excellent thermal shock resistance and superior strength properties that make it suitable for applications in harsh environments such as mining, petrochemical processing and red metal furnace/kiln furniture applications.

Reaction bonded silicon carbide (RB SiC) is produced by infiltrating molten silicon into porous carbon material packed in the desired form, then pressing and firing it without shrinkage or distortion. The material produced this way boasts porosities of 10-15% (of which 1-5% are opened porosities), producing comparable performance to RSIC with improved alkali erosion resistance and water vapor oxidation resistance.

NBSiC’s abrasion resistance depends on the soil conditions it is tested in. While its performance in light soils is generally good, its performance declines with heavy soils containing large proportions of fine grains due to them tending to clump together and create layers less resistant to tribological wear. Pore size distribution also plays an important part.

NBSiC is a composite material composed of large grains of silicon carbide encased by small needle-like grains of silicon nitride with strict interfaces between them, creating an environment conducive to excellent abrasion resistance and impact and friction wear resistance. Furthermore, NBSiC’s unique structure helps it resist brittle cracking that often occurs with sintered silicon carbide materials due to shock vibration, and also prevents brittle cracking due to shock protection from vibration; and has comparable abrasion resistance with steels or padding welds commonly used as tribological pairs.

Manufacturing

Silicon nitride ceramic refractories can be formed into various shapes for use in different applications. With excellent wear- and impact-resistance as well as thermal shock resistance, they make ideal materials for many demanding industrial uses. Silicon nitride also boasts chemical resistance and oxidation resistance at high temperatures, making it suitable for use across a wide variety of demanding industrial tasks.

Nitride-bonded silicon carbide is produced using the process known as nitridation. To produce it, SiC granulate and metallic silicon powder are heated at high temperatures in an atmosphere rich with nitrogen gas until metallic silicon reacts with it, creating bonds between SiC grains to form dense and strong materials with characteristic white hues resulting in the creation of thin oxidation layers on its surface – another characteristic characteristic of refractories made with this technique.

Sintered at temperatures between 2,000 to 2,200degC in an inert gas atmosphere, nitride-bonded silicon carbide is sintered at between 2000 to 2,200degC to produce both fine- and coarse-grained versions with grain sizes up to 1.5mm. Fine grained versions may feature up to 20g/cm3 density for exceptional mechanical strength in response to stress; its low thermal expansion properties also make it suitable for use in extreme hot environments.

Pressureless sintered silicon carbide (SSIC), another widely utilized nitride-bonded silicon carbide product, can be produced by pressing very fine SiC powder with an abrasive substance into a shape before heating to 1,380degC and pressurization at 1,318degC to form a block material with tight tolerances that can be machined using diamond tools.

Nitride-bonded silicon carbide outshines steel types commonly used in making soil working parts in terms of wear resistance, making it a good option for applications requiring resistance against impact and abrasion.