Silicon Carbide

Silicon carbide ceramic is an advanced, high-performance ceramic material primarily composed of silicon carbide (SiC).

Silicon carbide possesses the best thermal shock resistance of all advanced ceramic materials and excellent overall mechanical properties: excellent thermal conductivity, exceptional wear resistance, high temperature resistance, high strength, high toughness, and high durability.

The core advantage of silicon carbide ceramics lies in their versatile performance portfolio, with virtually no weaknesses:

1. Extremely High Hardness: With a Mohs hardness of 9.2-9.3, it ranks among the hardest materials in the world, second only to diamond and cubic boron nitride (CBN). This makes it extremely wear-resistant.
2. Excellent High-Temperature Performance: It maintains its strength at temperatures up to 1600°C, without softening or melting like metals. Its maximum operating temperature can reach 1650°C.
3. High Thermal Conductivity: It conducts heat very well, even exceeding some metals (such as aluminum). This is crucial for applications requiring heat dissipation.
4. Low Coefficient of Thermal Expansion: Dimensional changes are minimal when heated, resulting in excellent thermal shock resistance and the ability to withstand rapid temperature changes without cracking.
5. Excellent Chemical Stability: Highly resistant to acid and alkali corrosion, and resists oxidation even at high temperatures.
6. High Strength and Rigidity: High flexural strength and elastic modulus provide excellent structural stability.

• Seal Rings: Dynamic and static rings in mechanical seals, particularly in highly corrosive and high-temperature media, offer performance far exceeding that of cemented carbide and alumina ceramics. This is one of its most classic and widespread applications.
• Nozzles: Sandblasting and spray nozzles offer wear lifespans dozens of times greater than metal or other ceramic nozzles.
• Bearing Balls and Bushings: Used in high-speed, high-precision, corrosion-resistant machine tool spindles.

• Kiln Accessories: Used in rollers, crossbeams, and setters in high-temperature sintering furnaces operating above 1350°C. Their high-temperature load-bearing capacity and thermal shock resistance ensure stable kiln operation and long life.
• Burner Nozzles: Used in efficient and clean combustion systems.

• Key components in wafer manufacturing: diffusion furnace tubes, wafer boats, and paddles. Silicon carbide ceramics' high purity, high thermal conductivity, high-temperature deformation resistance, and corrosion resistance make them an irreplaceable carrier and transport material in semiconductor diffusion, oxidation, and annealing processes.
• Epitaxel trays: Used in MOCVD equipment to grow GaN (gallium nitride) LED chips, they are core consumables in the LED industry.

• Utilizing its ultra-high hardness and low density, it can be made into bulletproof inserts and armor plates for personal protection and vehicle and aircraft armor, effectively resisting the impact of armor-piercing projectiles. It is often combined with composite materials (such as polyethylene).

• Heat exchangers: Used in high-temperature waste heat recovery systems in the chemical and metallurgical industries, they offer high efficiency and long life.
• Porous ceramic filters: Used for dust removal and purification of high-temperature flue gases.

• Laser mirrors: Thanks to their high stiffness and low thermal deformation, they can be used as the base material for mirrors in high-power laser systems.
• Lightweight precision structural parts: used to replace metals in the aerospace field.