Silicon Nitride Powder

• High-purity Silicon Nitride Powder
• Si₃N₄ Powder
• Silicon Nitride Ceramic Powder
• High-purity technical ceramic material
• Excellent high-temperature stability
• High-temperature mechanical strength
• Excellent thermal shock resistance
• High fracture toughness
• High hardness
• Excellent wear resistance
• Excellent chemical resistance
• Excellent oxidation resistance
• Low thermal expansion
• High thermal conductivity for an electrical insulator
• Excellent electrical insulation
• Low dielectric loss
• Excellent dimensional stability
• Controlled α/β phase composition
• Fine particle-size distribution
• High sinterability
• Suitable for pressureless sintering
• Suitable for hot pressing
• Suitable for HIP processing
• Suitable for reaction-bonded silicon nitride
• Suitable for ceramic injection molding
• Suitable for additive manufacturing
• Suitable for advanced ceramic composites
• Suitable for ceramic bearings
• Suitable for cutting tools
• Suitable for semiconductor equipment
• Suitable for high-temperature components
• Suitable for aerospace and automotive ceramics
• Custom particle sizes available
• COA available

Property	Specification
Product Name	Silicon Nitride Powder
Chemical Name	Silicon Nitride
Chemical Formula	Si₃N₄
CAS Number	12033-89-5
Material Type	Advanced Technical Ceramic
Purity	95%, 98%, 99%, 99.5%, 99.9%, Custom
Appearance	Gray / Light Gray / Off-White Powder
Crystal Phases	α-Si₃N₄ / β-Si₃N₄ / Mixed Phase
Particle Size	Custom
D50	Submicron / Micron / Custom
Specific Surface Area	Custom
Morphology	Equiaxed / Irregular / Custom
Oxygen Content	Controlled
Carbon Content	Controlled
Metallic Impurities	Controlled
Sinterability	High
Density	~3.2 g/cm³ theoretical
Packaging	Bag / Bottle / Drum / Custom

• High-Purity Silicon Nitride Powder
• 99% Silicon Nitride Powder
• 99.5% Silicon Nitride Powder
• 99.9% Silicon Nitride Powder
• α-Silicon Nitride Powder
• β-Silicon Nitride Powder
• Alpha/Beta Mixed-Phase Si₃N₄
• Submicron Silicon Nitride Powder
• Micron Silicon Nitride Powder
• Ultrafine Si₃N₄ Powder
• High-Surface-Area Silicon Nitride
• High-Sinterability Silicon Nitride Powder
• Hot-Pressing Grade
• Pressureless-Sintering Grade
• HIP Grade
• Reaction-Bonded Silicon Nitride Grade
• Ceramic-Grade Si₃N₄
• Bearing-Grade Silicon Nitride
• Semiconductor-Grade Silicon Nitride
• Electronics-Grade Silicon Nitride
• Cutting-Tool Grade
• Wear-Resistant Ceramic Grade
• Additive-Manufacturing Grade
• Research-Grade Silicon Nitride
• Custom Silicon Nitride Powder

1. What is Silicon Nitride Powder?

Silicon Nitride Powder (Si₃N₄) is a fine ceramic powder used as the starting material for manufacturing advanced silicon nitride ceramics, composites, coatings, and precision-engineered components.

2. What is Silicon Nitride Powder used for?

Major applications include ceramic bearings, cutting tools, semiconductor equipment, high-temperature components, aerospace parts, automotive components, electrical insulation, wear-resistant ceramics, and advanced ceramic composites.

3. What is the difference between α-Si₃N₄ and β-Si₃N₄?

Alpha and beta silicon nitride are different crystalline phases. Alpha-Si₃N₄ is commonly used as a starting phase for sintering, while β-Si₃N₄ is important for producing elongated grain structures that can improve fracture toughness in certain ceramic microstructures.

4. What particle sizes are available?

REG Metals can source submicron, micron, and custom particle-size silicon nitride powders, including controlled D50 distributions for specific sintering and processing requirements.

5. Can oxygen content be controlled?

Yes. High-purity silicon nitride powders can be specified with controlled oxygen, carbon, iron, aluminum, calcium, magnesium, and other trace impurities.

6. Is Silicon Nitride Powder suitable for sintering?

Yes. Si₃N₄ powder is widely used for pressureless sintering, hot pressing, hot isostatic pressing (HIP), reaction bonding, and other ceramic manufacturing processes.