Silicon Nitride (Si3N4) Powder is a grey powder. Moh's hardness is 8.5. HM provides high-quality Silicon Nitride (Si3N4) Powder at a competitive price, which is an important structural ceramic material. It is a super-hard substance, inherently lubricious and resistant to wear and tear, and is an atomic crystal; it resists oxidation at high temperatures. It is also resistant to hot and cold shocks, and will not shatter when heated in air to over 1000 °C, sharply cooled, and then sharply heated.   

• Formula: Si3N4
• Density: 3.17 g/cm³
• Refractive index: 2.016
• CAS: 12033-89-5
• Water soluble: insoluble

Silicon Nitride Powder Specifications

Silicon Nitride Powder Properties

Silicon Nitride (Si3N4) Powder is a grey powder. Moh's hardness is 8.5. Silicon nitride is divided into α, β, γ three crystal types, α is a low-temperature phase (1350-1450 ℃ generated), the temperature reaches 1500 ℃ above α will be converted into β, α, and β phase is often symbiotic, γ phase can only be obtained at very high temperature and high pressure.

Silicon Nitride Powder Production Process

Silicon nitride (Si3N4) can be produced as a powder or as a film. The main methods are direct nitridation of silicon, the reaction of SiCl4 and NH3, carbothermal reduction of SiO2, and CVD. These versatile methods yield Si3N4 with high hardness, melting point, and chemical resistance for many applications.

Silicon Nitride Powder Applications

• Automotive engine parts 
• High-end bearings
• High-temperature resistant parts for immersion heaters
• Human medical replacement parts
• Cutting tools
• Electronic shielding materials
• IGBT 
• Solar polysilicon crucibles

Silicon nitride powder has various applications due to its high-temperature resistance, high strength, and good thermal shock resistance. Adding fluxes lowers the sintering temperature of silicon nitride ceramics to 1500-1700°C using discharge plasma sintering. Although silicon nitride ceramics have excellent properties, their high-cost limits market share. Reducing costs will expand their applications.