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Specifications
1.precision:G1,G2
2.Specification:3-30mm,with different gauge
3.Electrical insultion, non-magnetic
4.High rigidity
Best selling si3n4 sleeve ,silicon nitride rollers
Best selling si3n4 sleeve ,silicon nitride rollers
Silicon nitride rollers
1.Material:silicon nitride
2.Precision:G1-G2,with different gauge
3.idear products for bearing and chemical industry,and other rolling condition
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 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.
Silicon Nitride(Si3N4)Ceramic Characteristics
| Density g/cm3 |
Relative density % |
Elastic modulus Gpa |
Compression strength ratio(25°C) % |
Hardness Gpa |
| 3.24-3.28 | >99.5 | 300~320 | 40~50 | 16 - 20 |
| Fracture toughness /MPa•m1/2 |
Bending strength Mpa |
Poisson's ratio | Linear expansion coefficient 10-6K-1 |
Webuller modulus |
| 6.0~9.0 | 900~1000 | 0.25 | 3.1~3.3 | 12~15 |
| Thermal conductivity W•(m•K)-1 |
Specific resistance ratio | Corrosion resistance | Size stability | Magnetic |
| 15~20 | 10^18 | Excellent | Excellent | NO |
Technical data of silicon nitride roller
| Property | SSN | GPS-SSN | HPSN | RBSN |
| Density (g.cm-3) | 3.28 | 3.3 | 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 | 1150 | 1150 | 1150 | 1100 |
| Dielectric Constant | 9 | 9 | 9 | 7.5 |
| Abrasive Wear resistance Parameter | 1110 | 1130 | 1120 | 360 |
Features of silicon nitride rollers
1. high temperature strength
2. superior thermal shock resistance
3. excellent wear resistance
4. good fracture toughness
5. mechanical fatigue and creep resistance
6.excellent non-wetting property with good oxidation resistance
Key Applications of Silicon Nitride
1.Automotive: Bearings, Tappet Shims & Buckets, Cam Rollers, High pressured pumps parts, Turbocharge Rotors,
Rocker arm tips, Welding location pins, Squeeze Rollers for radiator tube manufacturing etc. for its superior mechanical reliability and wear resistance and corrosion resistance.
2. Balls & Bearings: Fully dense various size balls from o.5mm up to 50mm OD, Fully dense ceramic Bearing, Roller Bearing, Tapper Roller bearings & Plain Bearings for 60% lighter weight, electrical- magnetic insulating, 70% higher
speed, chemical resistance, high temperature etc. Also Hybrid bearing having ceramic Balls & rollers for high strength
3. Non-ferrous Foundries: Thermocouples sheaths, Riser Tubes, Heater Tubes, Valve rods, Valve seats, aluminium powder atomizer tubes, Molten metal pumps parts, Rotor for de-gassing shaft, Launders due to high temperature
capacity, excellent thermal shock, non-wetting properties.
4. CMM: Various types of styluses, styluses rods, Plain bearings, Ceramic balls etc.
5. Oil & Gas Industries: Sleeves, Plungers, Needles, compression Rings, seals etc. are used for the harsh environment produces chemical, wear, corrosion and high temperature challenges that can be met through the use of dense silicon nitride.
6. Nuclear & Defence: Due to lightweight, hard wear and toughness, this advanced ceramic are used as a were resistance tiles, impact plates, discs, ring etc. and also used for personnel body armors, vehicle, vessel, helicopter and aircraft etc. applications.
7. Electrical & Electronics: A large variety of high performance parts are manufactured for the electrical electronic industry due ti insulating and non-magnetic properties. Parts include wafer processing components, microwave specialty ceramics etc.
As a professional company in advanced ceramic industries, STA is manufacturing and 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..... 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 / Alumina ( 95% 96% 99% 99.5% 99.7% Al2O3 )
Zirconium Oxide / Zirconia ( Yttria stabilized ZrO2 )
Silicon Nitride ( Gas pressure sintered & Hot pressed Si3N4 )
Boron Carbide ( B4C )
Boron Nitride ( Hot pressed hexagonal BN )
Machinable Glass Ceramic
Aiming at building long term cooperation relationship with our clients, we set our motto as "Quality First". Far now, our products have been exported to North Amirica, East Europe, West Europe, East Asia, Southeast Asia and get good reputation from our client.
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