Silicon Nitride Ceramics
Silicon nitride ceramics feature low specific gravity, low thermal expansion coefficient, good thermal shock resistance and high fracture toughness. They are widely used in aerospace, automotive engines, machinery, chemical engineering and other fields, and demonstrate outstanding advantages especially as advanced high-temperature structural materials.
In the field of powder engineering, the density of silicon nitride classifier wheels for jet mills is 3.2 g/cm³, and its weight is two-thirds that of metal counterparts. The most prominent feature of silicon nitride classifier wheels is the elimination of metallic contamination. In addition, its specific gravity is 40% lower than that of zirconia ceramics, which can greatly reduce motor power consumption and lower motor load requirements. Overclocking can be achieved with existing motors to obtain finer particles.
As a new type of grinding medium, silicon nitride has attracted considerable attention for industrial applications due to its extremely low wear rate and excellent mechanical properties. Although its application is not widespread due to high material cost and limited machining capability, and its relatively low specific gravity is unfavorable for high-efficiency grinding, silicon nitride remains a highly promising grinding material when low wear loss is required for grinding media.
