Silicon Nitride Strip

Good Thermal Shock Resistant Silicon Nitride Strip 

Silicon nitride Strip is a kind of high-strength structural ceramics with broad development prospects. Compared with other ceramic materials, silicon nitride ceramics have high properties (such as high strength, high hardness, good thermal shock resistance, high fatigue toughness, high bending strength at room temperature, wear resistance, chemical corrosion resistance, good high-temperature stability, oxidation resistance, etc.), and have a small proportion. 

The difference between silicon nitride ceramics and ordinary silicate ceramics is that the combination of nitrogen and silicon belongs to covalent bonding, so it has the characteristics of strong adhesion and good insulation. The sintering process of silicon nitride is different from that of ordinary ceramics. The reaction sintering method is adopted. The silicon nitride ceramics made by this method can not achieve very high density, and generally can only reach about 79% of the theoretical density, One of the effective methods to improve the density of silicon nitride ceramics is pressure sintering at high temperature, which can obtain hot pressed silicon nitride ceramics. The bending strength at room temperature is generally 800 ~ 1000MPa. If a small amount of yttria and alumina are added to the hot pressed silicon nitride, the bending strength at room temperature can reach 1500MPa, which is among the best among ceramic materials and has high hardness, Is one of the hardest substances in the world; It is extremely resistant to high temperature, and its strength can be maintained at 1200 ℃ without decreasing. It will not melt into melt after heating, and will not decompose until 1900 ℃; It has amazing chemical corrosion resistance, can resist almost all inorganic acids (except hydrofluoric acid) and caustic soda solution less than 30%, and can also resist the corrosion of many organic acids. At the same time, it is also a high-performance electrical insulation material. Due to its small coefficient of thermal expansion and strong resistance to rapid temperature change, silicon nitride ceramics have excellent mechanical properties and play an important role in the application of engineering technology.