Reaction bonded silicon nitride is made by direct nitridation of a compacted silicon powder, and because of the difficulty of ensuring complete reaction; it is hard to achieve a high component density.
Usual densities are in the range 2.3 - 2.5g/cm3 compared with 3.29g/cm3 for gas pressured sintered silicon nitride.
The higher density gives the HPSN, SSN & GPS-SSN materials better physical properties and means they are used in more demanding applications at very high temperature, especially for non-ferrous molten metal handling and thermocouple sheaths. The nitridation produces only a small volume change, which means that RBSN components do not need to be machined after fabrication and complex near net shapes can be produced in a single process stage.
a. high temperature strength
b. superior thermal shock resistance
c. excellent wear resistance
d. good fracture toughness
e. mechanical fatigue and creep resistance
f. Excellent non-wetting property with good oxidation resistance
3. Technical data:
|Property||SSN GPS-SSN HPSN RBSN|
|Density (g.cm-3)||3.28 3.30 3.23 2.5|
|Young's Modulus (GPa)||285 320 315 189|
|Bend Strength (MPa)||675 750 850 440|
|Fracture Toughness K1c (MPa.m0.5)||6 7 8 2.5|
|Hardness (GPa)||16 16 16 7.2|
|Thermal Expansion Coefficient (x 10-6/°C)||3.2 3.2 3.2 3.2|
|Thermal Conductivity (W/m.K)||25 30 30 14|
|Maximum Temperature (°C) for application|
Abrasive Wear resistance Parameter
|1150 1150 1150 1100|
9 9 9 7.5
1110 1130 1120 360
As a professional company in advanced ceramic industries, HIGHBORN is supplying high quality and high precision ceramic components for clients from worldwide. Our ceramic products are widely used in various fields of automotive, metallurgy, machinery, electronic & electrical, food, chemical, medical and so on. With experienced engineers and talented workers, we are able to evaluate projects and drawings properly, make valuable suggestion, supply satisfying products. Our materials including:
- Aluminium Oxide ( 95% 96% 99% 99.5% 99.7% Al2O3 )
- Zirconium Oxide ( Yttria stabilized ZrO2 )
- Silicon Nitride ( Gas pressure sintered & Hot pressed Si3N4 )
- Silicon Carbide (Reactive sintered, Pressureless sintered & Recrystallization SiC)
- Aluminum Nitride
- Machinable Glass Ceramic
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