Hot-Pressed Silicon Nitride Ceramic

• High Strength and High Toughness: Among high-temperature ceramics, its fracture toughness is particularly outstanding, forming the basis for manufacturing high-performance silicon nitride ceramic structural components and silicon nitride parts.
• Excellent High-Temperature Performance: It can maintain relatively high strength and hardness at temperatures of 1200°C - 1400°C, making it an outstanding high-temperature resistant material.
• Superior Thermal Stability: Low coefficient of thermal expansion combined with good thermal conductivity results in excellent thermal shock resistance. This makes it ideal for products like silicon nitride tubes, silicon nitride crucible, and silicon nitride riser tubes.
• High Hardness and Wear Resistance: Extremely high hardness and excellent wear resistance make it particularly suitable for manufacturing wear-resistant silicon nitride products such as Si₃N₄ ceramic bearing and silicon nitride ceramic nozzles. A silicon nitride coating can also enhance surface properties.
• Good Chemical Stability: Resistant to corrosion by most acids, alkalis, and molten metals. Therefore, silicon nitride ceramic tubes and components are widely used in metallurgical and chemical industries. (Note: It is different from silicon nitrate or silicon nitrite).
• Low Density: Lightweight, beneficial for achieving weight reduction in moving components.

Based on its outstanding combination of properties, hot-pressed silicon nitride finds extensive application in high-end industrial and technological fields. The product forms are diverse, including silicon nitride plate, silicon nitride rods, silicon nitride ceramic tubes, and various custom silicon nitride ceramic parts. Other forms include silicon nitride fibers and silicon nitride nanofibers.

• Machinery, Automotive, and Bearing Industries:

Bearing Balls and Rings: Silicon nitride ceramic bearings are used in high-speed, high-precision, and corrosion-resistant applications.

Cutting Tools and Wear-Resistant Components: Silicon nitride ceramic rod stock can be processed into tools; silicon nitride rods and silicon nitride ceramic rods are used as wear-resistant components.

Turbine Rotors and Turbocharger Blades: Utilizes its lightweight and high-temperature resistant properties.

• Metallurgy, High-Temperature, and Semiconductor Industries:

Steel Rolling Rolls, Guide Wheels: Utilizes its properties of heat resistance, wear resistance, and non-sticking to metals.

Temperature Measurement and Melting Components: Silicon nitride thermocouple protection tubes are used in high-temperature corrosive atmospheres; silicon nitride ceramic crucibles are used for metal melting.

Semiconductor Carrying and Heat Dissipation: Silicon nitride ceramic substrates (Si₃N₄ substrate) and hot-pressed silicon nitride substrates have become key packaging materials due to their high thermal conductivity, high electrical insulation, and high strength. Silicon nitride ceramic substrate manufacturing is a specialized field. Reaction bonded silicon nitride is another manufacturing route.

• Energy, Chemical, and Fluid Control Industries:

Sealing Rings and Valve Components: Silicon nitride ceramic structural parts are used for pump and valve seals in extreme operating conditions.

Wear-Resistant Nozzles and Piping: Silicon nitride ceramic nozzles and silicon nitride tubes are used in severely erosive environments. (For Si₃N₄ price, market factors apply).

• Aerospace and Defense Industries:

Radar Domes and Engine Components: Utilizes its wave-transparent (silica nitride property), thermal shock resistant, and high-temperature strength properties.