Silicon nitride ceramic, simply put, is an inorganic ceramic material that does not shrink during sintering. As you know, silicon nitride is extremely strong and a very hard material. Its outstanding characteristics make its applications very diverse. Below, the editor will introduce in detail the performance features of silicon nitride ceramic.
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1. Excellent heat resistance. As is well-known, silicon nitride has no melting point under normal pressure; it only decomposes at temperatures above 1870 degrees. Therefore, products made from silicon nitride ceramics have unparalleled heat resistance.
2. Low thermal expansion coefficient. Products processed from silicon nitride ceramic have an extremely high thermal conductivity and can effectively resist thermal shock. Should the temperature range between 0 and 1000 degrees Celsius result in thermal impact, the product will not crack.
3. It exhibits exceptional chemical stability and strong corrosion resistance. Silicon nitride does not react chemically with any inorganic acids, except for hydrofluoric acid. It does not react with oxygen below 800 degrees Celsius. Above 800 degrees Celsius, it reacts with oxygen to form a silicon dioxide film on its surface. As the temperature continues to rise, the silicon dioxide film gradually stabilizes. When the temperature reaches around 1000 degrees, a dense silicon nitride film forms on the surface. This demonstrates that silicon nitride ceramics have an extremely high thermal resistance.
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4. Due to the extremely high hardness of silicon nitride, which is only slightly less than diamond, products made from silicon nitride ceramics are highly resistant to wear and possess strong mechanical impact resistance.
In summary, due to the exceptional performance characteristics of silicon nitride, products made from silicon nitride ceramics offer greater advantages over those made from other materials. Therefore, it not only serves as a high-performance insulating material but also plays a crucial role in the aerospace industry.
