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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 can resist almost all inorganic acid solutions, caustic soda below 30% and many organic acids. 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 to make it a promising material for high temperature structural materials. These include high high temperature strength, 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 nitride (or silicon carbide), silicon oxynitride (or silicon carbide) or silicon carbide.
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 consists of a silicon-nitride-bonded silicon carbide prepared by reaction sintering in a high-temperature nitrogen atmosphere using silicon carbide powder as the raw material, and metal Si fine powder as the final product. This material has remarkably improved performance.
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