Other Applications Of Silicon Nitride

Silicon nitride ceramic materials have excellent properties such as high thermal stability, oxidation resistance, and high dimensional accuracy. Because silicon nitride is a covalent compound with high bond strength and can form an oxide protective film in air, it also has good chemical stability. It will not oxidize at a temperature below 1200°C, and the protective film formed at 1200~1600°C can prevent further oxidation. It will not penetrate molten metals or alloys such as aluminum, lead, tin, silver, brass, and nickel, but can corrode in molten liquids such as magnesium, nickel-chromium alloy, and stainless steel.

Silicon nitride ceramic materials can be used to make high-temperature engineering parts, advanced refractory materials in the metallurgical industry, corrosion-resistant parts and sealing elements in the chemical industry, and knives and cutting tools in the machinery industry.

Because silicon nitride can form a strong bond with silicon carbide, aluminum oxide, thorium dioxide, boron nitride, etc., it can be used as a binding material and modified in various ratios.

In addition, silicon nitride can be used in solar cells. After the silicon nitride film is precipitated by PECVD, it can be used not only as an anti-reflective film to reduce the reflection of incident light, but also during the deposition process of the silicon nitride film, the hydrogen atoms from the reaction product enter the silicon nitride film and the silicon wafer, playing the role of a defect passivator. The ratio of nitrogen atoms in silicon nitride is not strictly 4:3, but fluctuates in a certain range depending on various process conditions. The physical properties of the film corresponding to different atomic ratios are different. It is used for ultra-high-temperature gas turbines, aircraft engines, electric furnaces, etc.