Silicon Nitride Crucible

The strength of silicon nitride, especially hot-pressed silicon nitride, is one of the hardest substances in the world.


Silicon Nitride Crucible, Si3N4 crucible


Silicon nitride crucible is sintered by gas pressure sintering, it has good resistance to acid and weak alkaline corrosion, such as boiled hydrochloric acid, concentrated nitric acid, aqua regia, sulfuric acid, sulfuric acid and aluminum hydroxide solution with a concentration below 25%. This dense silicon nitride has excellent oxidation resistance and can be used stably in an oxidizing atmosphere below 1400 ° C. Silicon nitride material also has good stability to metal melts and is not wetted, such as molten metals zinc, gold, silver, aluminum, cadmium, indium, lead, bismuth, gallium, germanium, etc. and their alloys such as yellow copper, hard aluminum, nickel silver, etc. all have good corrosion resistance.

Silicon nitride ceramic is an inorganic material ceramic that does not shrink during sintering. The strength of silicon nitride, especially hot-pressed silicon nitride, is one of the hardest substances in the world. Si3N4 plate & sheet is a covalent bond compound with high strength, low density, and high temperature resistance.


Silicon Nitride Crucibles Description


Density3.22 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


Packing of Silicon Nitride Crucible


As a ceramic material, silicon nitride is quite fragile in a lot of cases. Our silicon nitride crucibles are carefully handled to minimize damage during storage and transportation. Suitable outer boxes and inner cushioning materials are used for Si3N4 products, vacuum packing is also engaged for some of the parts.


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