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NR0220 Micro Silicon Nitride (α-Si3N4) Powder (CAS No. 12033-89-5)

  • Catalog No. NR0220
  • CAS Number 12033-89-5
  • APS 800μm, or customized
  • Molecular Weight 140.2833
  • Form Gray powder
  • Purity 99.9%
  • Orientation α Phase

Micro Silicon Nitride (α-Si3N4) Powder Description

Micro Silicon Nitride (α-Si3N4) (CAS: 12033-89-5) is a dense, high-strength, and high-toughness ceramic material developed by scientists in the 1970s. Silicon nitride has been used in many industrial applications such as engine components, bearings, and cutting tools. Silicon nitride has better high-temperature performance than most metals, combined with high strength stability and creep and oxidation resistance. In addition, its low coefficient of thermal expansion makes it good thermal shock resistance compared to most ceramic materials.

Micro Silicon Nitride (α-Si3N4) Powder Properties

Alpha (α-Si3N4) and beta (β-Si3N4) silicon nitride are two different crystal structures of silicon nitride.

α-Si3N4 is known for its thermal shock resistance and electrical insulating properties.

1. Hexagonal Crystal Structure: α-Si3N4 has a hexagonal crystal structure, which results in anisotropic properties. This means its properties vary with crystallographic direction.

2. Lower Temperature Form: It is the form of silicon nitride that is stable at lower temperatures, typically below 1,200°C.

3. Excellent Thermal Shock Resistance: α-Si3N4 exhibits outstanding resistance to thermal shock due to its ability to create a self-healing silica layer when exposed to oxygen at high temperatures.

4. Electrical Insulator: It is an excellent electrical insulator.

Micro Silicon Nitride (α-Si3N4) Powder Specifications

CAS Number


Chemical Formula


Molecular Weight



gray powder

Specific Surface Area(m2/g)


Bulk Density(g/cm3)


Tap Density(g/cm3)



Soluble in nitric acid and hydrofluoric acid. Insoluble in water.

Micro Silicon Nitride (α-Si3N4) Powder Applications

  1. Cutting Tools: Utilized for its excellent wear resistance and high-temperature stability in the production of cutting tools.
  2. Bearings: Used in high-performance bearings, especially in high-speed and high-temperature environments.
  3. Automotive Components: Employed in engine components like turbochargers and EGR systems due to their thermal stability and lightweight properties.
  4. Aerospace: Applied in aerospace for components requiring high-temperature resistance and lightweight characteristics.
  5. Electronic Components: Used as an insulator or substrate in high-power electronic devices due to its outstanding electrical insulating properties.

Micro Silicon Nitride (α-Si3N4) Powder Packaging

Our Micro Silicon Nitride (α-Si3N4) is carefully handled during storage and transportation to preserve the quality of our product in its original condition.

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