Silicon Nitride Ceramics: Types, Properties, and Applications of Advanced Nitride Materials
Silicon Nitride Ceramics are advanced ceramics primarily composed of nitrides, with two main crystalline forms: α-silicon nitride and β-silicon nitride. Depending on the sintering process, they are categorized into hot-pressed silicon nitride and reaction-bonded silicon nitride.

КОНТАКАТ США

Sintering Processes

Hot-Pressed Silicon Nitride

• • This type is made by pressing silicon nitride powder into a mold and sintering it at 1700°C under 20-30 MPa pressure.
  • It produces dense, pore-free ceramics with excellent flexural strength and toughness.

Reaction-Bonded Silicon Nitride

• • It starts with silicon (Si) or silicon nitride (Si₃N₄) powder, which is shaped and then heated in a nitrogen-rich atmosphere to form silicon nitride (Si + N₂ → Si₃N₄).
  • The final products are highly precise in dimensions but contain 20%-30% porosity, which makes them less strong, hard, and tough compared to hot-pressed silicon nitride.

Among all ceramics, silicon nitride offers the best thermal shock resistance.

Main Features из Silicon Nitride Ceramic

• Excellent self-lubrication and wear resistance
• Low thermal expansion coefficient
• Outstanding thermal shock resistance
• High hardness and a low friction coefficient (0.1-0.2)
• Good chemical stability and electrical insulation

Silicon Nitride Ceramic Property Chart

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