What is Silicon nitride?
Silicon nitride is an inorganic substance with the chemical formula Si3N4. It is an important structural ceramic material with high hardness, inherent lubricity, wear resistance, and atomic crystals; it is resistant to oxidation at high temperatures. Moreover, it can resist the impact of cold and heat. It will not be broken if it is heated to more than 1000℃ in the air, cooled rapidly and then heated rapidly. It is precisely because of the excellent characteristics of silicon nitride ceramics that people often use it to manufacture bearings, turbine blades, mechanical seal rings, permanent molds and other mechanical components. If silicon nitride ceramics, which are resistant to high temperatures and difficult to transfer heat, are used to make the heating surfaces of engine components, not only can the quality of the engine be improved, fuel savings, and thermal efficiency can be improved.
The application of Silicon nitride:
Silicon nitride ceramic materials have excellent properties such as high thermal stability, strong oxidation resistance and high product size accuracy. Since silicon nitride is a covalent compound with high bond strength and can form an oxide protective film in the air, it also has good chemical stability. It will not be oxidized below 1200°C. The formation of a protective film at 1200~1600°C can prevent further It is oxidized and will not be infiltrated or corroded by many molten metals or alloys such as aluminum, lead, tin, silver, brass, nickel, etc., but can be corroded by molten magnesium, nickel-chromium alloy, stainless steel, etc.
Silicon nitride ceramic materials can be used for high-temperature engineering components, advanced refractories in the metallurgical industry, corrosion-resistant components and sealing components in the chemical industry, tools and cutting tools in the machining industry, etc.
Since silicon nitride can form a strong bond with silicon carbide, aluminum oxide, thorium dioxide, boron nitride, etc., it can be used as a bonding material to be modified in different proportions.
In addition, silicon nitride can also be applied to solar cells. After the silicon nitride film is plated by the PECVD method, it can not only be used as an anti-reflection film to reduce the reflection of incident light, but also, during the deposition of the silicon nitride film, the hydrogen atoms of the reaction product enter the silicon nitride film and the silicon wafer, Played a role in passivating defects. The ratio of the number of silicon nitride to silicon atoms is not strictly 4:3, but fluctuates within a certain range according to different process conditions. The physical properties of the film corresponding to different atomic ratios are different.
Due to the excellent characteristics of Silicon nitride in electrical, thermal and mechanical properties, it is widely used in ultra-high temperature gas turbines, aircraft engines, electric furnaces, etc.
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