Silicon Carbide for Ceramics
Silicon Carbide for Ceramics
Silicon carbide ceramic is a high-tech ceramic, mainly made of submicron silicon carbide powder. Silicon carbide has high hardness, and silicon carbide ceramics made by mature technology have good wear resistance, high temperature resistance and corrosion resistance.
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Why SiC is Ideal for Ceramics
- High Hardness: With a Mohs hardness of 9.5, silicon carbide is nearly as hard as diamond, providing ceramics with excellent wear resistance.
- High Thermal Conductivity: SiC has exceptional thermal conductivity, making it suitable for high-temperature applications.
- Low Thermal Expansion: The low thermal expansion coefficient of silicon carbide ensures dimensional stability under varying temperatures.
- Corrosion Resistance: SiC is highly resistant to corrosion from acids, alkalis, and molten metals, enhancing the longevity of ceramic products.
- High Temperature Resistance: Silicon carbide can withstand extreme temperatures, making it ideal for use in furnace linings and high-temperature machinery.
Applications of Silicon Carbide Ceramics
Ceramic Bearings
SiC bearings provide excellent wear and corrosion resistance, making them ideal for use in extreme environments such as high-temperature or chemically harsh settings.
Armor Ceramics
Silicon carbide is widely used in the production of lightweight ceramic armor due to its exceptional hardness and toughness. This armor is used in military applications and personal protective equipment.
Kiln Furniture
Silicon carbide kiln furniture is designed to endure high temperatures and rapid heating cycles without cracking, warping, or degrading over time.
Wear-Resistant Ceramics
Silicon carbide ceramics are often used in pumps, valves, and seals, where extreme wear and chemical corrosion occur.
Heat Exchangers
With high thermal conductivity and corrosion resistance, SiC ceramics are used in heat exchangers, especially in chemical processing applications.
Grades of SiC for Ceramics
- Black Silicon Carbide (C)
- High hardness and thermal conductivity.
- Primarily used in abrasive and cutting tools.
- Green Silicon Carbide (GC)
- Purity of over 99%, used in fine ceramics for high-precision applications such as semiconductor manufacturing.
- Reaction Bonded Silicon Carbide (RBSC)
- Highly durable and often used in kiln furniture and high-stress ceramic components.
- Sintered Silicon Carbide (SSiC)
- Known for its exceptional hardness and corrosion resistance, often used in mechanical seals and pump components.
Types of Silicon Carbide Abrasives
Black Silicon Carbide
Black silicon carbide is a widely used abrasive product, with excellent wear resistance, high hardness, high density, low impurities and other advantages, commonly used in sandblasting grinding, polishing, free grinding, making various abrasives, etc.
Green Silicon Carbide
Green silicon carbide is made from quartz sand and petroleum coke refined in a resistance furnace, due to its relatively stable chemical properties, high thermal conductivity, low coefficient of thermal expansion, and good wear resistance.
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