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Silicon Nitride application:
Silicon nitride has many unique properties and is an important engineering ceramic. Silicon nitride has excellent mechanical properties at high temperatures. These include low density, high flexural and fracture strength, high modulus elasticity, high wear resistance, and high resistance to solid particles erosion. The material is also very strong and hard. Material also exhibits excellent thermal properties. It has minimal temperature-induced shrinkage and can resist thermal shock (rapid temperature changes). Finaly, silicon nitride is a material with excellent chemical properties. It can withstand most acids, alkalis, gases corrosive to metals, and even 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 conduct heat. The heat transfer coefficient determines whether engineering materials are suitable for applications requiring 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 a long-term implant in the human body will be in a watery or salty environment. The corrosion resistance of the material is mainly due 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 molten metallic salts. The oxide layer has a complex and important role to play in 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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