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Silicon nitride Has high strength. Especially hot-pressed silica nitride which is one the hardest materials on the planet. It can withstand temperatures up to 1200degC and maintain its strength. After heating, it will not turn into a melted substance and won’t decompose till 1900degC.
The silicon nitride material is highly resistant to chemical corrosion. It is resistant against almost all organic and inorganic acid solutions. It’s also a highly-performing electrical insulating materials.

Ceramics made of silicon nitride have many excellent properties. They are used for bearings as well as turbine blades.

Silicon Nitride as a Refractory Material

The excellent high temperature properties of silicon nitride are considered as a promising material for high temperature structural applications. These include high high-temperature strengths, corrosion resistance and good wear resistance.

(1) Application to ironmaking refractories
Recent years have seen significant improvements in the corundum-silicon-carbide-silicon-nitride products used for large-scale blast-furnaces. In the middle section and load-bearing part of large blast furnaces as well, silicon carbide, silicon carbide or silicon oxynitride refractory materials have been widely applied.

2) Application in steelmaking Refractories
The bottom ladle material has been made of silicon nitride in recent years. The addition of silicon-nitride materials to the slideplate improves wear resistance and erosion resistance of the slideplate, as well reducing the price of steel per ton for ladle refinement.

(3) Application to refractory smelting non-ferrous metals, such as copper, aluminum, zinc, etc.
Silicon nitride does not wet metal solutions at high temperature, so it is suitable for high-temperature products in the nonferrous metal smelting processes, such as thermowells. Smelting furnace linings. Container linings. Crucibles. Silicon nitride ceramic products have good thermal shock resistance and can be used stably for a long time at high temperatures or in high-temperature-low-temperature cycles.

(4) Application in kiln furniture materials
The ceramic shed is composed of silicon carbide and metal Si fine powders, both prepared through reaction sintering at high temperatures in nitrogen atmosphere.

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