Ceramics (Silicon nitride powder)

Silicon nitride ceramic powder (Si ∝ N ₄) is a high-performance engineering ceramic material with excellent high temperature resistance, mechanical strength, and chemical stability, widely used in structural ceramics, electronic devices, and other fields. The following is its key information:
1. Basic characteristics
Crystal structure: There are three crystal forms: α – Si ∝ N ₄, β – Si ∝ N ₄, and γ – Si VNet N ₄, all of which are composed of [SiN ₄] ⁴⁻ tetrahedra as structural units, forming a three-dimensional network.
Performance parameters: high temperature resistance (high bending strength at high temperatures), high hardness, coefficient of thermal expansion close to silicon, and resistance to acid and alkali corrosion.
2. Preparation standards
National standard: GB/T 37258-2018 specifies the technical requirements for silicon nitride powder prepared by silicon powder nitriding method, including nitrogen content ≥ 37%, maximum particle size ≤ 40 μ m, and references international testing methods such as ISO 17947.
3. Main applications
Industrial field: used for structural ceramic products such as silicon nitride ceramic bearing balls, cutting tools, and semiconductor substrate materials.
Technical advantage: It can replace nickel based alloys and is suitable for high temperature and high mechanical impact environments.