Silicon carbide is an extremely hard and dense material with high strength that can be formed into various shapes by advanced production techniques such as sintering. Sintered products produced through this process are substantially non-porous and highly useful in engineering applications.
Reaction sintering employs carbon and residual silicon found in powder to produce face centered cubic silicon carbide ceramics with compact structures and strong flexural bending strength, while chemical vapor deposition provides highly pure silicon carbide with an enormous specific surface area.
High Strength
Sintered silicon carbide’s hardness and strength rival that of diamond, making it suitable for applications where endurance and efficiency are critical, such as tooling and precision devices that need long lifespan, grinding wheels and aerospace/defense components like valves/pumps; as well as bulletproof vests. Its application also extends to areas like aerospace/defense components (nozzles/valves/pump) that could otherwise shatter upon impact energy. With such strength-to-weight ratio characteristics comparable to diamond’s, sintered silicon carbide can take abuse that would shatter most other materials, making sintered silicon carbide the go-to material of choice in aerospace/defense components (nozzles/valves/pumps/bombards/vaxels/pumps), as well as bulletproof vests/baxels.
Direct sintered silicon carbide differs from reaction-bonded sic in that it uses high-purity, nano-grade raw powder for production. Sintering allows densification at temperatures between 2100-2200degC to create stronger bonding between material grains resulting in superior resistance against oxidation, chemical corrosion, and abrasion.
High Temperature Resistance
Silicon carbide can withstand very high temperatures, making it suitable for industrial uses that demand resistance to heat, abrasion and corrosion. Common applications include automotive industry applications for nozzles and valves as well as ballistic protective equipment able to withstand impact from high velocity projectiles.
Silicon Carbide can be purchased in either green or biscuit forms or fully dense state (sintered), depending on its application. Sintering processes often result in shrinkage of up to 20% which makes maintaining tight tolerances during machining difficult prior to sintering; green and biscuit forms can be machined more easily with diamond tools for maximum accuracy.
High Temperature Stability
Silicon Carbide is an extremely tough material that is suitable for aerospace, military and semiconductor manufacturing applications due to its resistance against impacts, oxidation and temperature extremes. As such it makes for ideal material choice when manufacturing critical products in extreme conditions.
Reaction bonded silicon carbide (RB SiC) features a ceramic matrix that helps its particles adhere securely, maintaining strength at higher temperatures. This material can be utilized in chemical labs for reactions, calcinations and high temperature synthesis applications.
Sintering is a high-temperature process used to create rigid structures from powdered materials without melting them, making this technology useful in the manufacture of complex-shaped components in various materials.
High Wear Resistance
Sintered silicon carbide stands out among advanced ceramics as one of the lightest, hardest, and strongest materials available today, boasting incredible strength and durability compared to its lighter alternatives. It boasts high resistance against chemical corrosion, abrasion, thermal shock and erosion.
Due to its inherent toughness and durability, SSiC is ideal for high-speed applications involving significant impact forces; additionally, its lightweight composition helps save aircraft weight for improved performance and fuel economy.
Reaction sintering yields dense materials that retain their shape well at elevated temperatures, boasting a high modulus of rupture – meaning they can absorb a significant amount of stress before breaking. This property makes them perfect for bulletproof vests which must withstand fast-moving projectiles without cracking under their weight.
High Thermal Conductivity
Silicon Carbide boasts high thermal conductivity and has an exceptional modulus of rupture that allows it to withstand impacts that would fracture other materials.
Sintering creates a dense material with excellent strength and fracture toughness, suitable for making tools or precision devices. Due to its corrosion, fatigue and chemical attack resistance it also excels as aerospace/defense components such as valves or mechanical seals and pumps.
Sintered SiC is widely used for ballistic armour plates that meet national military specifications for protection from high velocity projectiles, as well as vehicle and personal protection systems.
High Precision
Sintered silicon carbide boasts a high modulus of rupture, providing greater shock absorption and stress resistance than many other materials. Furthermore, its durability allows it to tolerate higher speeds and vibration.
Hardness and strength make triboelectric materials the perfect material for wear-resistant seals, triboelectric materials, thermal insulation applications and automotive components such as thermocouple protection tubes.
Silicon Carbide can be easily machined in its green and biscuit states, however for tight tolerance parts sintering may be required to fully densify it. CVD SiC features a face-centered cubic polycrystalline structure. Each formation method greatly influences its final microstructure – for instance reaction bonded silicon carbide is produced by infiltrating compacts of powdered silicon carbide with carbon-containing additives before reacting at high temperatures to form additional silicon carbide particles.
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