Silicon nitride ceramic structural parts

Introduction to silicon nitride ceramic structural parts

Silicon nitride ceramic structural parts have low thermal expansion coefficient and high thermal conductivity, so they have excellent thermal shock resistance. Within a temperature of 1200°C, silicon nitride structural parts have high strength and impact resistance. The hot-pressed sintered silicon nitride will not break even if it is put into cold water after being heated to 1000°C. At temperatures that are not too high, silicon nitride has high strength and impact resistance, but it will be damaged as the use time increases above 1200°C, reducing its strength. It is more prone to fatigue damage above 1450°C. Therefore, the operating temperature of Si3N4 generally does not exceed 1300°C.

Application scope of silicon nitride ceramics:

rotating ball and roller bearings;

Engine parts: valves, rocker arm pads, sealing surfaces;

Induction heating coil holder;

Turbine blades, blades, buckets;

welding and brazing fixtures;

Heating element assembly;

welding positioner;

Precision shafts and bushings in high-wear environments;

Thermocouple jackets and tubes;

Semiconductor process equipment.

Silicon nitride ceramic properties

1. High strength in a wide temperature range;

2. High fracture toughness;

3. Good bending strength;

4. Resistant to mechanical fatigue and creep;

5. Lightweight – low density;

6. High hardness and wear resistance;

7. Excellent thermal shock resistance;

8. Low thermal expansion;

9. Electrical insulator;

10. Good antioxidant properties;

11. Good resistance to chemical corrosion.