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

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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.