Description

Item	Specification / Reference
Material	Silicon Nitride (Si₃N₄)
Appearance	Black / Gray-black
Density	Approx. 3.2–3.25 g/cm³*
Hardness	Approx. HRA 92–94*
Bending Strength	≥900 MPa*
Fracture Toughness	Approx. 6–8 MPa·m¹ᐟ²*
Thermal Expansion Coefficient	Approx. 2.95–3.0 × 10⁻⁶/K*
Thermal Conductivity	Approx. 23–25 W/(m·K)*
Size	Standard or customized
Application	Nut Projection Welding, Resistance Welding
Manufacturing	Precision ceramic machining

Advantages and Limitations
Advantages
· High hardness and excellent wear resistance
· Excellent electrical insulation
· High thermal-shock resistance
· Low thermal expansion
· Good high-temperature stability
· Low welding-spatter adhesion
· Stable positioning during repeated welding cycles
· Suitable for automated and high-volume production
· Customizable according to customer drawings

Limitations
· Ceramic is more brittle than metal and should be protected from impact and excessive bending loads.
· Proper installation and fixture alignment are important to prevent chipping or mechanical damage.
· The actual service life depends on welding current, weld cycle, mechanical loading, fixture design, and operating temperature

Typical Industries

Automotive | EV Manufacturing | Auto Parts | Sheet Metal Fabrication | Resistance Welding | Projection Welding | Welding Fixtures | Robotic Welding | Automation Equipment