Silicon Nitride With Special Characteristic

As a refractory material, silicon nitride has a series of unique advantages, which make it widely used in many industrial fields.

Silicon nitride has no melting point and sublimates and decomposes at 1900℃ under normal pressure, which makes it stable in high temperature environment. Silicon nitride materials can maintain high strength even at high temperature, with small high temperature deformation, small high temperature creep and good high temperature stability. Its high temperature bending strength can even reach thousands of megapascals. When silicon nitride ceramics are oxidized, a dense silicon dioxide film is easily formed on the surface, which prevents it from further oxidation. Its oxidation resistance temperature can reach 1400℃, and it can be used up to 1870℃ in a reducing atmosphere.

The hardness of silicon nitride is very high, ranging from 9 to 9.5, second only to a few superhard materials such as diamond and BN. At the same time, silicon nitride ceramics have high fracture toughness and room temperature strength. Silicon nitride ceramics have a small friction coefficient, self-lubricating properties, and wear resistance, which helps reduce wear and energy consumption of equipment during operation. Silicon nitride has a low coefficient of linear expansion, which helps reduce stress caused by thermal expansion in high-temperature environments and improves its thermal shock resistance. Silicon nitride has good thermal conductivity, which helps the equipment maintain uniform temperature in high-temperature environments and avoid local overheating.

Silicon nitride is very chemically stable and is not corroded by any inorganic acid except hydrofluoric acid. It can also exist stably in some alkalis. This makes silicon nitride refractory materials stable in a variety of chemical environments. Silicon nitride does not wet high-temperature metal solutions and molten slag, so it has excellent resistance to slag corrosion. Silicon nitride material has good insulation properties and is a good insulator material at high temperatures. Silicon nitride ceramics can be machined to achieve the required shape, precision, and surface finish, which helps meet the requirements of different industrial fields for the shape and precision of refractory materials. Due to the above-mentioned excellent properties, silicon nitride is considered to be a high-temperature structural material with great development prospects.

In summary, silicon nitride as a refractory material has many unique advantages, including excellent high temperature performance, good mechanical properties and self-lubricating properties, outstanding thermophysical properties, strong chemical stability, excellent electrical properties and machinability. These advantages have made silicon nitride widely used in many industrial fields such as steel, non-ferrous metal smelting, kiln furniture materials, etc.

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