Silicon nitride protective sleeve

Features

1. Mechanical Properties:
Vickers hardness can reach over 1600 HV (HRA 90+).
Bending strength is as high as 600-800 MPa.
It possesses high toughness and can withstand complex mechanical loads without easily fracturing or deforming.
2. High Temperature Resistance:
It can operate stably in air up to 1200℃.
Under a protective atmosphere, it can even reach 1400℃.
It has a low thermal expansion coefficient (3.0×10⁻⁶/℃) and excellent thermal shock resistance (can withstand rapid temperature changes from 1000℃ to cold water).
3. Corrosion Resistance:
It has strong resistance to acids, bases, and various corrosive media (such as molten salts and organic solvents).
There is almost no corrosion in sodium hydroxide solutions with a concentration below 30%.
It reacts very weakly with inorganic acids except hydrofluoric acid.
4. Self-Lubricating Properties:
The SiO₂ thin film formed by surface oxidation can significantly reduce the friction coefficient (0.02-0.1).
It reduces wear on the sealing interface, with a wear rate only 1/10 of traditional metal materials.