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The Main Characteristics of Silicon Nitride

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Silicon Nitride application:

Silicon nitride has many unique characteristics and is an important engineering ceramic. Silicon nitride has excellent mechanical properties at high temperatures. These include low density, a high modulus of elasticity and fracture toughness as well as high wear and resistance to solid particles erosion. The material is also very tough and strong. Material also exhibits excellent thermal properties. It has minimal temperature-induced shrinkage and expansion. Finaly, silicon nitride is a material with excellent chemical properties. It can withstand most acids and alkalis as well as corrosive gases and liquid metals.

Silicon Nitride – Main Characteristics

It is also a good thermal conductor, which makes it suitable for many industrial applications. Thermal conductivity is a material’s inherent ability to transfer or conduct energy. Heat transfer coefficients are a critical factor when determining whether engineering materials will work in extreme temperatures. The low thermal conductivity of silicon nitride is due to its unique chemical and microstructure composition.


The material is extremely stable due to the strong atomic bonds. It is resistant to both acidic and alkaline solution corrosion at room temperature. This is especially important when considering implantation of the material in a body with a salty or watery environment. The corrosion resistance of the material is attributed primarily to the formation an oxide layer at the surface. The same corrosion resistance was observed in tests where silicon nitride had been placed in hot gases and metals. The formation of an oxide layer is crucial to the corrosion resistance.


The self-reinforced structure, high strength, toughness and other excellent properties of silicon nitride have made it a popular structural component in a variety of industries, including biomedical.


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