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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.
Silicon nitride resists chemical corrosion with amazing strength. 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 such that they can be used as a structural material for high temperature applications. These include high strength at high temperatures, 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 coke kilns, large blast furnaces are commonly made from silicon carbide, silicon oxynitride, or silicon nitride refractory materials.
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 the wear and erosion resistance of the slideplate, as well as its service life. It also reduces the price of steel per tonne of ladle refinement.
(3) Application to refractory smelting non-ferrous metals, such as copper, aluminum, zinc, etc.
Silicon nitride does not wet out with metal solution at high temperature, so it is suitable for high-temperature items in the nonferrous metal smelting processes, such as thermowells. Smelting furnace linings are also available, along with various container linings. Crucibles can also be made of silicon nitride. 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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