Reaction Bonded Silicon Carbide

Reaction-bonded silicon carbide is an ultra-resilient ceramic material that offers exceptional strength against impact and wear, thermal shock resistance, and chemical attack.

Formulations of porous SiC and carbon particles, when infiltrated with liquid or gaseous silicon, become self-bonding due to chemical reaction between silicon and carbon. Silicon reacts with carbon to form additional silicon carbide particles which further bind original particles together.

High Strength

Reaction bonded silicon carbide (RBSiC) is an extremely durable ceramic material, offering superior chemical resistance, impact strength, wear resistance and thermal shock tolerance. Produced by infiltrating molten silicon into porous carbon or graphite preforms where it reacts with carbon to form SiC, its superior strength and high ductility make RBSiC ideal for near net forming processes like pressing, injection molding and extrusion allowing large parts to be formed with tight tolerances.

RB SiC’s lower hardness compared to sintered silicon carbide makes it easier to shape, making complex engineered pieces made out of this material easier than ever to form and design to protect equipment against abrasion and impact – increasing durability as well as safety. Furthermore, its thermal shock resistance and ability to recover rapidly from rapid temperature changes makes it an excellent material choice for use in power plants, steel mills, mining operations or anywhere where equipment must function in extreme temperatures.

RBSiC not only boasts superior strength, but it is also noted for its exceptional dimensional stability and outstanding corrosion resistance. Furthermore, RBSiC boasts an extremely low thermal expansion coefficient and maintains its mechanical properties even at high temperatures, making it suitable for tunnel kilns, hydraulic fracturing pumps and other industrial uses. Furthermore, this lightweight material can easily be formed into larger components for applications like mechanical seals and flow control chokes in mining operations.

High Temperature Stability

Reaction-bonded silicon carbide ceramics can withstand temperatures up to 1350 degC without suffering significant dimensional change and possess excellent chemical resistance properties, making them perfect for mining industry applications such as cyclones, flow control chokes and large wear components.

Reactive Melt Infiltration (RMI) of carbon preforms involves infiltrating them with liquid silicon through reactive melt infiltration (RMI). As part of the RMI process, liquid silicon seeps into pores by capillary force and reacts with the amorphous carbon to form b-SiC. Remaining unreacted carbon particles and unreacted carbon are refined via multiphase carbon, thus refining porosity further and decreasing formation of islands within RB-SiC as part of net formation with excellent dimensional tolerances.

Reaction bonded silicon carbide outshines sintered silicon carbide by possessing higher thermal conductivity and lower coefficient of expansion at high temperatures, making it more suitable for applications in which vibration, impact, abrasion or thermal shock is prevalent. This makes reaction bonded silicon carbide an ideal material choice in environments such as industrial machine shops.

Reaction bonded silicon carbide offers superior resistance to high-temperature corrosion as well as passive and active oxidation, making it suitable for large-scale component manufacture with its dimensional stability, high strength, chemical resistance and abrasion resistance. It can be formed into various shapes and sizes easily. It’s especially suited to manufacturing large, complex components due to its shapeability.

Thermal Shock Resistance

Reaction bonded silicon carbide (RB SiC) offers excellent thermal shock resistance, making it suitable for applications where temperature extremes are common. This is due to its low coefficient of thermal expansion – meaning it does not expand or contract significantly when exposed to rapid changes in temperature. Furthermore, it boasts one of the highest hardness values among engineering materials, making RB SiC incredibly tough and resilient.

RB SiC stands up well against impact, making it an excellent material choice for mechanical seals, pipe liners, mechanical components, flow control chokes and larger wear components in mining industries and heavy-duty machinery. Produced by injecting molten silicon into porous carbon or graphite preforms and reacting with carbon to form silicon carbide; shapes and sizes may be tailored depending on specific application requirements.

She et al conducted tests on RB silicon carbide to evaluate its thermal shock resistance, by evaluating its strength in four-point bending after exposure to temperature increases from room temperature up to 1,000 degC. Their findings demonstrated that thermal stress caused failures within fiber-bonded ceramics with cracks propagating between fibrous elements and through their interfaces; their carbon sources used during reaction sintering such as carbon black or coarse micro-spherical graphited carbon determined the material behavior.

Chemical Resistance

Reaction bonded silicon carbide (RB SiC) is a high-density ceramic material with excellent chemical and corrosion damage resistance properties, including acids, alkalis and solvents as well as corrosion damage resistance. Due to its low coefficient of expansion it can be tailored for many shapes and sizes including mechanical seals, flow control chokes, pumps and large wear components commonly found in mining cyclone applications.

Silicon Carbide produced by infiltrating porous carbon or graphite preforms with liquid or gaseous silicon is stronger and has superior thermal stability than sintered varieties. As a result, this form is ideal for applications requiring lower hardness levels but higher temperature stability.

Corrosion damage to RB SiC ceramic is minimal, with excellent resistance against oxidation, hydrochloric acid, sulfuric acid, hydrobromic acid and strong alkalis. Furthermore, its low permeability helps it achieve exceptional chemical resistance.

Sintered silicon carbide tends to be more costly than RB SiC; however, it can be useful in applications where low hardness levels are acceptable but improved thermal stability is required. RB SiC offers greater manufacturing flexibility as well as being more cost-effective than sintered silicon carbide.

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