Silicon nitride ceramics is a material with great application potential
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Author : TRUNNANO
Update time : 2020-12-03 09:17:34
Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. Silicon nitride is very strong, especially hot-pressed silicon nitride, which is one of the hardest materials in the world. It has high strength, low density, high-temperature resistance and other properties.
Si3N4 ceramic is a kind of covalent bond compound. The basic structural unit is [SiN4] tetrahedron. The silicon atom is located in the center of the tetrahedron. There are four nitrogen atoms around it. They are located at the four vertices of the tetrahedron. The tetrahedrons share the form of an atom, forming a continuous and solid network structure in three-dimensional space.
Application examples of Si3N4 ceramics as structural materials
Using the lightweight and high rigidity of Si3N4, it can be used to manufacture ball bearings. It has higher precision than metal bearings, generates less heat, and can operate in higher temperatures and corrosive media. The steam nozzle made of Si3N4 ceramics has the characteristics of wear resistance and heat resistance, and no obvious damage after being used in a 650℃ boiler for a few months, while other heat and corrosion-resistant alloy steel nozzles can only be used for 1-2 months under the same conditions. Using the lightweight and high rigidity of Si3N4, it can be used to manufacture ball bearings. It has higher precision than metal bearings, generates less heat, and can operate in higher temperatures and corrosive media. The steam nozzle made of Si3N4 ceramics has the characteristics of wear resistance and heat resistance, and no obvious damage after being used in a 650℃ boiler for a few months, while other heat and corrosion-resistant alloy steel nozzles can only be used for 1-2 months under the same conditions.
Wide application prospects of Si3N4 ceramic materials
With the improvement of Si3N4 powder production, molding, sintering and processing technology, its performance and reliability will continue to improve, and silicon nitride ceramics will be more widely used. Si3N4 ceramics have excellent comprehensive properties and abundant resources and have the characteristics of wear resistance, corrosion resistance, high-temperature resistance, oxidation resistance, thermal shock resistance and low specific gravity that are incomparable with general metal materials. It can withstand the harsh working environment where metal or polymer materials are difficult to handle. As one of the important members of the high-temperature structural ceramics family, Si3N4 ceramics have better mechanical properties, thermal properties and chemical stability than other high-temperature structural ceramics such as oxide ceramics and carbide ceramics, so they are considered high-temperature structural ceramics. The material with the most application potential.
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