Projection-welded (spot-welded) silicon nitride Locating pins are used to weld metal nuts to metal plates in precise locations. Silicon nitride Locating pins mainly use silicon nitride to have high strength, wear resistance, metal melt corrosion resistance (silicon nitride ceramics have a large contact angle with metal, and almost no chemical reaction occurs), and insulation. Silicon nitride Locating pins are very suitable for projection welding (spot welding) joints because if insulated silicon nitride Locating pins are used during the welding process, unnecessary current will pass through, causing sparks to occur between the pin and the workpiece, resulting in After the pin is worn, it cannot be positioned, which reduces the quality and qualification rate of the workpiece. And because sparks are generated, the workpiece often requires additional through-hole processing. At present, silicon nitride projection welding (spot welding) positioning pins have been used in large auto parts factories, and the overall cost performance is 70 times that of steel positioning pins.

Silicon nitride Performance

Item

Unit

Si3N4

Type

Gas pressure sintered

Density

g/cm3

3.2-3.3

Color

Black, Grey

Young Modulus

GPa

300~320

Vickers Hardness

GPa

15 – 17

Compressive Strength

MPa

2200

Bending Strength

MPa

600-1000

Thermal Conductivity

W/m.K

20-30

Thermal Expansion

10-6/°C

3.2

Max. Working Temp.

°C

1200

Volume Resistivity

Ω ·cm

> 1014

Dielectric Constant

6

Dielectric Strength

kV/mm

12

Fracture toughness

MPa·m1/2

5.0-7.0

Advantage of the Si3N4 Locating pins

– Silicon nitride locating pins have higher wear resistance, corrosion resistance, and high-temperature resistance, and can work stably in harsh environments such as high temperature, high humidity, and high corrosion.

– Silicon nitride locating pins also have a low thermal expansion coefficient and good insulation properties, which can effectively reduce the impact of thermal errors and electromagnetic interference on machine accuracy.

Application of the Si3N4 Locating pins

-Ultra-precision machining: used to locate and support ultra-precision machine tools and measuring instruments

– Aerospace: used to locate and support aircraft and satellites

-Medical care: used to locate and support medical equipment, such as surgical robots and endoscopes

Packing

Silicon Nitride Locating pins use appropriate outer boxes and internal buffer materials, and some components are also vacuum-packed.