Silicon nitride (Si₃N₄). This compound was carefully synthesized from nitrogen and silicon. It exhibited excellent electrical, thermal, and mechanical properties. Its crystal phases are diverse, including α-silicon nitride of needle-like crystals and β-silicon nitride of granular crystals, so that it can work stably up to 1400 ° C in an oxidizing atmosphere, and can heat up to 1850 ° C in a neutral or reducing atmosphere.

Starting from the upstream materials silicon powder and nitrogen, through a series of complex processes, including raw material treatment, powder synthesis, forming, sintering and other links, finally made of high-quality silicon nitride ceramic products. The quality of these products is measured by a series of strict technical indicators, such as bulk density, open porosity, hardness, etc.

Mechanical and thermal advantages of silicon nitride ceramics

Silicon nitride ceramics not only inherit the hardness, heat resistance, wear resistance and other characteristics of ordinary ceramics, but also show excellent mechanical and thermal performance. It has strong thermal shock resistance, high temperature creep resistance, good self-lubrication performance, good chemical stability, low density, dielectric constant and dielectric loss are also quite excellent. Compared with mainstream high temperature ceramic materials, such as alumina ceramics and zirconia, its heat resistance and high temperature strength is better; Compared with silicon carbide, although most of its properties are similar, the fracture toughness is nearly 2 times higher.

Properties and applications of silicon nitride ceramics

Silicon nitride ceramic is a kind of hard, high temperature, high strength ceramic material with excellent mechanical, chemical and thermal properties. It has a wide range of applications in machinery, electronics, chemical and other fields. This paper focuses on the properties and applications of silicon nitride ceramics.

The performance characteristics of silicon nitride ceramics

1. High hardness

The hardness of silicon nitride ceramics can reach 2000-3000Hv, which is 6 to 7 times higher than ordinary steel and 3 to 4 times higher than ordinary ceramics, and can be matched with diamond in hardness.

2. Good heat resistance

Silicon nitride ceramics have extremely high heat resistance, can operate at high temperatures for a long time, and can withstand high temperatures of up to 1700℃.

3. Good corrosion resistance

Silicon nitride ceramics have excellent corrosion resistance, will not be corroded by acid, alkali and other chemical media, and can maintain good stability in acid and alkali environment.

4. Good oxidation resistance

Silicon nitride ceramics are not easy to be oxidized at high temperatures, can maintain good oxidation stability, and can be used in high temperature and high oxidation environment for a long time.

5. Low density

Silicon nitride ceramics have a density of 3.2g/cm³, which is lower than other ceramic materials and can be manufactured into lightweight products.

6. Other features

Silicon nitride ceramics also have other characteristics such as wear resistance, fatigue resistance, bending resistance and so on, with excellent comprehensive performance.

The application field of silicon nitride ceramics

1. Mechanical manufacturing

Silicon nitride ceramics are widely used in the field of mechanical manufacturing, such as high-speed bearings, cutting tools, abrasives and so on. Among them, silicon nitride ceramic blades are widely used in the cutting of rubber, paper and other thin film materials.

2. The automotive industry

Silicon nitride ceramics have a wide range of applications in the automotive industry, such as silicon nitride ceramic coating for automotive piston rings, which can significantly improve the performance and life of automotive engines.

3. Electronics

Silicon nitride ceramics are widely used in electronic products, such as light-emitting diode radiators, which can improve heat dissipation efficiency, good stability and extend the service life of LED. Silicon nitride ceramics can also be used for infrared sensors.

The development trend of silicon nitride ceramics

With the continuous development of science and technology, silicon nitride ceramics will be more and more widely used in People's Daily life. The research and application of silicon nitride ceramics still have great room for development, and can be widely used in electronics, manufacturing and other fields. At the same time, around the research and development and application of silicon nitride ceramics, related technologies and manufacturing processes will also be continuously improved and perfected to achieve better performance and application.

Silicon nitride ceramic is a kind of high performance ceramic material, with many excellent physical and chemical properties, and has a wide range of applications in mechanical manufacturing, automotive industry, electronic products and other fields. Its application prospects are very broad, I believe that with the continuous development of technology, silicon nitride ceramics will have an important position in more fields.