Silicon carbide ceramics are among the hardest and most durable available, featuring resistance to high temperatures, abrasion, corrosion and other harsh environments. Silicon carbide makes for a fantastic material choice in harsh environments due to its ability to withstand high temperatures, wear-and-tear and corrosion.
Sintering is a high-temperature technique used to convert powdered materials into solids, often for use in producing silicon carbide products through traditional ceramic forming processes.
Hardness
Silicon Carbide (SiC) ceramic is one of the hardest non-oxide ceramics, second only to diamond on Mohs hardness scale. With good abrasion resistance and corrosion resistance as well as holding its strength at high temperatures, SiC ceramic excels for sliding contact applications such as mechanical seal faces or product lubricated bearings thanks to its pore-based lubrication mechanism which outshines conventional sintered and reaction bonded materials in harsh industrial environments. Hexoloy SP SiC ceramic is particularly suitable for sliding contact applications like mechanical seal faces or product lubricated bearings due to its superior pore-based lubrication mechanisms compared with sintered and reaction bonded materials on such applications due to its superior pore-based lubrication mechanisms compared with conventional sintered and reaction bonded materials in harsh industrial environments.
Sintered silicon carbide is made by pressing and sintering (heating) silicon carbide powder into desired shapes using either hot pressing or cold pressing techniques, with hot pressing generally being the more preferred approach due to its lower temperature requirement, reduced grain growth during sintering, and ability to produce complex-shaped products.
Reaction-bonded silicon carbide is formed by heating silica sand mixed with petroleum coke at very high temperatures in an open furnace to produce its crystal formation, before sintering to create its final form. Reaction bonded silicon carbide offers several advantages over its traditional sintered ceramic counterparts such as shorter sintering times and near net shapes due to lower sintering temperatures required during production.
Reaction bonded silicon carbide does have some disadvantages, including possible impurities and uneven densities, making it unsuitable for use in highly abrasive or corrosive environments.
Strength
Sintered silicon carbide’s density makes it an extremely strong material, making it suitable for vehicle and personal protection systems to shield military and law enforcement personnel from high-velocity projectiles. Furthermore, its hardness and density help absorb impact energy for energy absorption purposes and decrease injuries sustained during impact events. Our sintered silicon carbide ceramics meet or surpass national military requirements to offer reliable protection in any situation or environment.
Silicon Carbide’s high strength makes it the perfect material for thermocouple sensor protective coatings in harsh industrial settings, helping monitor accurate temperatures despite corrosion-inducing gases and environments with extreme wear and tear. Our protective coatings are highly durable and resist abrasion, erosion and thermal shock shock so as to maintain maximum sensor life without incurring damage or failure.
Sintered silicon carbide is a technical ceramic that retains its strength even at elevated temperatures, boasting one of the highest heat resistance ratings among technical ceramics. Furthermore, its thermal conductivity makes it particularly suitable for various applications.
Morgan’s Hexoloy SP SiC is a pressureless sintered alpha silicon carbide material featuring exceptional hardness, abrasion resistance and temperature stability. Additionally, its unique porous structure acts as fluid or lubricant reservoirs to promote low friction between sliding component surfaces; making this material superior to traditional reaction-bonded silicon carbides in many application areas such as mechanical seals and product lubricated bearings.
Thermal Conductivity
Silicon carbide (commonly referred to as Carborundum, Karnudm or SiC) is an extremely hard material composed of carbon and silicon that has the second hardest surface on Earth due to its strength, chemical resistance and electrical semiconductivity properties. Furthermore, this fine ceramic exhibits superior temperature stability in temperatures up to 1400 degC while remaining strong.
Morgan’s PGS-100 Sintered Silicon Carbide is an outstanding material choice for applications involving corrosion and abrasion due to its combination of hardness, strength, thermal shock resistance and chemical resistance. It boasts superior wear resistance thanks to the addition of free graphite which enhances lubricity while its thermal shock resistance can be attained with its unique microstructure; making this material an excellent option for all types of hardface pair seals that operate under extreme conditions like high speed, low rpms and high pressures.
Silicon Carbide comes in two forms – reaction bonded and sintered. Reaction bonded SiC is produced by infiltrating compacts made up of mixtures of silicon and carbon with liquid silicon that reacts with its surface to bond it back to its original powder form. Reaction bonded SiC can then be shaped into complex shapes using conventional ceramic forming processes such as extrusion, cold isostatic press and injection molding processes for complex designs – featuring superior strength at high temperatures as well as resistance against acids or lyes. Sintered forms come predominance over their reaction bonded counterparts when it comes to strength.
Resistance to Corrosion
Sintered silicon carbide’s high hardness enables it to withstand harsh environments, high speeds, and temperatures, while its corrosion-resistance makes it suitable for chemical pump seals, valves, nozzles, paper textile equipment and general industrial machine parts. Furthermore, its hardness and strength also make SSiC an excellent material choice for ballistic protection systems that enable military personnel and law enforcement agents to safely shield themselves against high velocity projectiles.
Corrosion occurs when ceramics are exposed to environments with differing chemical properties, such as hot gaseous or liquid media. Corrosion leads to the formation of an additional film or scale on their surfaces that differs chemically from their bulk ceramic, leading to corrosion.
Material used in the semiconductor industry must have excellent corrosion resistance, especially those exposed to fluorine-containing gases such as CHF3 or CClF3. A novel sintering method has been created which produces sintered silicon carbide with superior hydrofluoric acid and nitric acid corrosion resistance.
SSiC is produced through pressing and sintering ultra-pure submicron powder with non-oxide sintering aids to form ultra-pure silicon carbide powder. In contrast to reaction bonded silicon carbide (RBSiC) produced through infiltrating compacts of mixtures of SiC and carbon with liquid silicon, this process ensures direct crystal contact between grains without second phase structures at grain boundaries forming.
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