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Silicon Nitride Ceramic Cylinder
Density : 3.20 g/cm3
Hardness : Mohs 9
Max. Service Temp. : 1,200 ℃
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Product Introduction
Silicon nitride was selected over a variety of other technical advanced ceramics because to its high strength and hardness, low porosity, high fracture toughness, and ability to resist high Hertzian stresses during rolling contact fatigue with spall failures comparable to steel. A comparison of the material characteristics of a metal cam roller assembly (bearing steel and bronze) to Si3N4 ceramics indicates that silicon nitride ceramic cylinder for bearings do provide quicker accelerations owing to its density. Si3N4 ceramic is considerably tougher than steel, has a lower thermal expansion coefficient, and acts as an electrical insulator. Additionally, silicon nitride cylindrical roller for bearings has a low coefficient of friction when sliding against steel, as opposed to steel/steel or steel/bronze, and does not show microwelding when in contact with steel (a common cause of galling and scuffing in metal component lubricated wear). Additionally, Si3N4 ceramic cylinder for bearings is considerably less susceptible to unlubricated operation. The friction coefficient of silicon nitride rollers remains constant in dry/flooded circumstances (ball on flat tribometer contact).
Material Comparison of Si3N4 to Steel and Bronze
MATERIAL PROPERTIES | UNIT | ROLLER STEEL | BRONZE | SILICON NITRIDE |
Density | g/cm3 | 7.8 | ~8.7-9.3 | 3.20-3.30 |
Elastic Modulus | GPa | 210 | ~72-93 | 290-320 |
Poisson Ratio | % | 0.28 | - | 0 |
Hardness HK0.5 | kg/mm2 | ~700 | - | >1,500 |
Hardness HRc | - | 60 | <0.9 (off scale) | >75 |
Volume Resistivity | ohm·cm | 60·10-6 | 10-20·10-6 | >1·1012 |
Thermal Expansion Coefficient | 10-6/℃–1 | 10.9 | 6·10-6 | 3.2 |
Material Properties of Silicon Nitride
ITEM | UNIT | SILICON NITRIDE | GPSN |
Main Content | - | Si3N4>95% |
Colour | - | Black, Dark Grey |
Density | g/cm3 | 3.20-3.30 |
Vickers Hardness | Gpa | 15 |
Flexural Strength | Mpa | 580 |
Compressive Strength | Mpa | 2,200 |
Electrical Resistivity | ohm·cm | >1012 |
Dielectric Strength | KV/mm | 19 |
Dielectric Constant | 1 MHz | 9.6 |
Heat Conductivity | W/m.K | 27 |
Maximum Use Temp. | ℃ / ℉ | 1,200 / 2,190 |
Resistance to Thermal Shock | △T(℃) | 750 |
Coefficient of Thermal Expansion (25 - 1,000 ℃) | 10-6/K | 3.0 - 4.0 |
Note: Although we have no reason to doubt the accuracy of the data presented, this information is offered for comparison only. Exact properties will vary depending on the manufacturing method and part configuration, and can sometimes be tailored to meet specific requirements.
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