What Is Silicon Nitride Used For?

Silicon nitride is widely used in electronic devices, optoelectronic devices, and thermal management due to its excellent insulation properties and high temperature resistance.
In the field of electronic devices, silicon nitride film is widely used. It can be used as a high-quality insulating layer, isolation layer, and dielectric layer to provide reliable insulation and stable performance for electronic devices. These characteristics make silicon nitride an ideal material for manufacturing products such as microelectronic devices, integrated circuits, and large-scale integrated circuits.
In the field of optoelectronic devices, silicon nitride film also plays an important role. Using its optical properties, silicon nitride can be used to prepare high-efficiency optical films, optical waveguide devices, and photodetectors. These devices are widely used in optical fiber communications, laser radar, spectral analysis, and other fields.
In the field of thermal management, the high thermal conductivity of silicon nitride makes it an ideal heat dissipation material.
It can be used to prepare high-thermal conductivity packaging materials and heat sinks to improve the heat dissipation effect of electronic devices and ensure their stable operation.

Generally speaking, people only know the characteristics of the equipment, and laymen don't know much about this synthesis process. However, ZhenAn has summarized the synthesis methods of ferrosilicon nitride that people often ask about. You can take a look if you have time:

There are two methods for synthesizing ferrosilicon nitride. One is a new method for synthesizing ferrosilicon nitride, namely the flash combustion synthesis method.

Although silicon nitride and ferrosilicon nitride are a kind of high-temperature raw materials that should be more common on the market, the preparation methods of ferrosilicon nitride mostly adopt direct nitridation, carbon thermodynamic nitridation, gas chromatography deposition, decomposition reaction, etc. The new technology and process of flash combustion synthesis of ferrosilicon nitride, which will be explained below, can synthesize silicon nitride and ferrosilicon nitride continuously, on a large scale and at low cost under atmospheric pressure.

During production, ferrosilicon powder and ferrosilicon nitride are mixed and continuously metered and sent to a continuous reactor heated to 1200℃, and nitrogen is introduced at the same time. Silicon nitride powder and ferrosilicon nitride are evenly dispersed, and under the effect of gravity and nitrogen friction resistance, they float and fall in the hot nitrogen, fully contact and transfer heat with the hot nitrogen, and are rapidly heated. In the combustion reaction area, they quickly produce a combustion synthesis reaction with nitrogen. The reaction itself generates a lot of heat, which can self-sustain the continuous development of flash combustion synthesis.

In steelmaking, granular ferrosilicon nitride was first used in the production of oriented silicon steel, which can relatively stably supplement a certain amount of nitrogen for molten steel.
The amount of ferrosilicon nitride used in China reaches hundreds of tons a year. The progress of smelting technology has enabled the rapid development of high-strength microalloyed steel production in my country. The strengthening microalloying elements of steel are mainly vanadium, niobium, and titanium. After calculation, comparison and actual production application, the FeV50+Fe Si3N4 microalloying scheme is used to produce HRB400 steel bars. The alloying cost is 127.61 yuan lower than the cost of FeV50 per ton of steel, and 44.21 yuan lower than the cost of VN12 microalloying per ton of steel. If this technology is popularized, it will be of great significance to the cost reduction and efficiency improvement of construction steel production enterprises. Ferrosilicon nitride, as a cheap alloy that provides nitrogen source, has good application prospects in other steel grades in the future.