Silicon Nitride Ceramic

Silicon Nitride ceramic offers both outstanding mechanical strength and extraordinary thermal shock resistance. So it’s an ideal material when dynamic stress and thermal rigor are required. Compared with most metals, Silicon Nitride can withstand higher temperature, resist oxidation and corrosion, and has properties of high wear resistance. With all this combination of properties, Silicon Nitride is broadly used for high-temperature and high-stress applications which require great mechanical strength along with excellent corrosion and wear resistance.

Material Properties

High fracture toughness;
High strength at high temperature;
Good flexural strength;
Exceptional hardness, abrasion resistant;
Low density-low weight compared with steel;
Excellent thermal shock resistance;
Low thermal expansion;
Electrical resistivity;
Chemical inertness.

Silicon Nitride Ceramic Introduction

There are several different methods used to produce Silicon Nitride. Materials produced by different method are slightly different. Here introduced two popular methods: gas over-pressure sintering and hot isostatic pressing.

Gas Over-Pressure Sintered Silicon Nitride Ceramics
This is the most popular method to produce Si3N4 components with high toughness, high strength and various complex shapes. This method sinters silicon nitride compact in 5-12MPa nitrogen at 1800-2100°C. Due to the high-pressure nitrogen atmosphere, the decomposition temperature of Si3N4 is increased, which is conducive to the selection of sintering aids that can form intergranular phases with high refractoriness to improve the high temperature performance of the material.

Hot Isostatic Pressed Silicon Nitride Ceramics
The mixture powder of silicon nitride and sintering aid is packaged in a metal or glass sheath, and sintered at high temperature through high-pressure gas after vacuuming. The commonly used pressure is 200MPa and the temperature is 2000°C. Hot isostatic pressing of silicon nitride can remove any pores from the material and reach the theoretical density, which results in greater hardness and toughness. But this process is complicated and costs high.

Applications
Turbines and high-end bearing balls
Ball valve components
Mechanical seal faces
Induction heating coil supports
Welding guide Pins, welding fixture
Heating Element components
Metal tube welding roller cam roller
TIG welding nozzle, plasma welding nozzle
High wear rod and shaft
Thermocouple protection sheath, riser tube
Insulating heat dissipation substrate
Crucibles

Silicon Nitride Ceramic

Silicon Nitride Tube

Silicon Nitride Rod

Silicon Nitride Ball

Si3N4 Ceramic

Silicon Nitride Ceramic Applications

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Silicon nitride tubes have outstanding mechanical and thermal characteristics, as well as excellent chemical stability, allowing them to withstand demanding working environments where metal or polymer materials are unbearable.

Zirconia Ceramic

FAQ'S

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Q1: What are the applications of silicon nitride?

>>>

Rotating ball bearings & rollers bearings
Cutting tools
Engine components: valves, rocker arm pads, seal faces
Supports for induction heating coil
Vanes, buckets, and turbine blades
Brazing and welding jigs
Heating element components
Crucibles
Metal tube forming rolls and dies
TIG / Plasma welding nozzles
Weld positioners
Precision shafts and axles in high wear environments
Thermocouple sheaths and tubes
Semiconductor process equipment

Q2: What are the advantages of silicon nitride?

>>> Its low thermal expansion coefficient offers good thermal shock resistance when compared to other technical ceramics. It has superior oxidation resistance, is extremely hard, and outperforms most metals in high temperatures. As a result, silicon nitride is capable of withstanding the harshest conditions in applications that require high temperatures and heavy loads.

When silicon nitride bearings are installed in the main engine of space shuttles, even NASA scientists could not deny their extraordinary qualities. It was identified as one of the few monolithic ceramic materials capable of withstanding the severe thermal shock and thermal gradients produced by hydrogen / oxygen rocket engines, and it proved completely reliable throughout the entire space shuttle program.

Q3: Why Choose Silicon Nitride?

>>> Silicon Nitride (Si3N4) is the technical ceramic material with the most versatile combination of mechanical, thermal, and electrical properties. It is an exceptionally hard technical ceramic with outstanding thermal shock and impact resistance. It outperforms most metals at high temperatures and has an excellent combination of creep and oxidation resistance. It is a wonderful material that can withstand the harshest conditions in the most demanding industrial applications thanks to its low thermal conductivity and high wear resistance. When the need for high-temperature and high-load capabilities arises, silicon nitride is a favorable option.