Silicon Nitride With High Quality

Specification granularity: natural block, 10-100mm, 10-60mm, 3-10mm, 1-3mm, 0-1mm, or customized according to customer requirements.

Packaging: Ton bag packaging (1000kg/bag) or customized according to customer requirements.

Silicon nitride (Si3N4) is an important structural ceramic material. It is a gray, white or off-white powder. The density of silicon nitride ceramics is relatively low, only 41% of that of steel bearings, but the specific value varies depending on the preparation method and conditions. For example, the density of Si3N4 produced by reaction sintering is 1.8~2.7g/cm3, and the density of Si3N4 produced by hot pressing is 3.12~3.22g/cm3. The hardness of silicon nitride is extremely high, second only to diamond and cubic boron nitride, with a Mohs hardness of 9~9.5, a Vickers hardness of about 2200, and a microhardness of up to 32630MPa. Silicon nitride has no melting point and usually decomposes at around 1900℃ under normal pressure. The melting point can reach 1900℃ under pressure. Silicon nitride has good chemical stability. Except for hydrofluoric acid, it does not react with other inorganic acids. At the same time, it can resist corrosion from a variety of organic acids and caustic soda solutions below 30%.

The preparation methods of silicon nitride mainly include direct nitridation of silicon powder, carbon thermal reduction, thermal decomposition, sol-gel, chemical vapor deposition and self-propagating method, etc. Different preparation methods are suitable for different production needs and scales, and the purity and performance of the silicon nitride obtained are also different.

Silicon nitride is widely used in many fields and industries due to its excellent properties such as high strength, high hardness, good wear resistance, high temperature resistance, thermal shock resistance and good chemical stability. For example, in the machinery manufacturing industry, silicon nitride can be used as cutting tools, wear-resistant parts such as bearings, balls, mechanical seals, etc. In particular, silicon nitride ceramic bearings have high precision, high speed, high load and good operating performance in high temperature environments. In the aerospace field, silicon nitride can be used for engine parts, turbine blades and other parts working in high temperature environments. Its high temperature resistance can ensure that these parts maintain stable performance in high temperature environments. In the automotive industry, silicon nitride can be used in engine parts such as turbocharger rotors, bearings and valves, which helps to improve engine efficiency and durability.

With the advancement of science and technology and the acceleration of industrialization, the application field of silicon nitride will continue to expand. At the same time, the preparation technology of silicon nitride will continue to improve and innovate to improve its purity and performance to meet higher-level application needs. Especially in the field of new materials, silicon nitride will play a more important role and promote the development and progress of related industries.

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