Silicon Nitride Rod

We provide silicon nitride welding rod, pin and regularly used rods.


Silicon Nitride Rod


Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. There are five different methods to produce Silicon Nitride including SRBSN, GPSN, HPSN, HIP-SN and RBSN, make the application and working material different slightly. In these 5 methods of production, GPSN is most commonly used to produce Si3N4 components. The strength of silicon nitride, especially hot-pressed silicon nitride, is one of the hardest substances in the world. Si3N4 Rod is a covalent bond compound with high strength, low density, and high temperature resistance.

The silicon nitride nozzles and covers have the characteristics of oxidation resistance, high temperature strength and less sputter adhesion, which can prolong the service life of the welding parts. We provide silicon nitride welding rod, pin and regularly used rods.


Silicon Nitride Rod, Welding Pin Description


Size1-20mm diameter
Density3.21 g/cm3
Flexural strength800 MPa
Fracture toughness6.5 MPa m^1/2
Thermal stress parameters569 K


Data Sheet & Typical properties of silicon nitride material:


 TypeGas pressure sintered
 Colordark grey
 Water Absorption%0
 Young ModulusGpa290
 Vickers HardnessGpa18 – 20
 Compressive StrengthMpa2200
 Flexural StrengthMpa650
 Thermal ConductivityW/m.K25
 Thermal Shock ResistanceΔ(°C)450 – 650
 Max. Working Temp.°C1200
 Volume ResistivityΩ ·cm> 10^14
 Dielectric Constant8.20
 Dielectric StrengthkV/mm16
* Tests under room temperature environment;

* The above information is offered for comparison only. Exact properties will vary depending on the manufacturing method.


Typical properties of silicon nitride ceramics


-High strength over a wide temperature range

-High fracture toughness

-High hardness

-Outstanding wear resistance

-Low thermal expansion and high thermal conductivity

-Good thermal shock resistance

-Good resistance to chemical and oxidation


Based on the above properties, Silicon Nitride Ceramic is an ideal choice in a wide range of industries, such as:


-Bearing balls and rollers

-Bearing technology in automotive engineering

-Seal Rings

-Valves, turbocharger rotors for engines

-Turbine blades

-Diesel engine glow plugs

-Molten metal handling

-Thermocouple sheaths

-Welding jigs and fixtures

-Welding Rollers


-Centering Pins

-Drawing Tools

-Tube Forming Tools

-High-performance Cutting Tools

-Indexable Inserts

-Tubes and Pipes

-Mechanical Engineering Special Applications


Packing of Silicon Nitride Rod & Welding Pins


As a ceramic material, silicon nitride is quite fragile in a lot of cases. Our silicon nitride rod & welding pins are carefully handled to minimize damage during storage and transportation. Suitable outer boxes and inner cushioning materials are used for Si3N4products, vacuum packing is also engaged for some of the parts.


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