Full Ceramic Bearings
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Benefits of the ceramic (Si3N4) silicon nitride ball bearing:
- Higher Speeds
- Corrosion Resistant
- Higher Temperatures - 800ºC
- Little to No Lubrication Required
- Longer Life/Low Friction & Less Heat
- Non-Magnetic
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We can offer specials on build to suit.
MATERIALS: Your choice of
** FULL CERAMIC BEARINGS (both rings and balls are silicone nitride) in either full compliment or with Teflon retainer.
** Or: HYBRID CERAMIC BEARING (both rings are 52100 chrome steel with ceramic balls)
Typical Hybrid Bearing
| Ceramic vs. Steel |
| Item |
Bearing Steel |
Ceramics (SI3N4) |
Characteristics of Ceramic
Bearings |
| Density (g/m?) |
7.8 |
3.2 |
Higher Speed
Decreased centrifugal force
Reduced Ball Skidding
Lower Operating Temperature
Less wear
Less Friction |
| Heat Resistance (ºC) |
180 |
800 |
Maintains stability at high
temperatures |
| Coefficient of linear thermal expansion (1/ºC) |
12.5 X 10?6 |
3.2 X 10?6 |
Minimal Ball Deformation
Lower operating Temperature
Stable Running Preload
Reduced Contact Angle Change |
| Vicker's Hardness (HV) |
700~800 |
1400~1700 |
Reduced Ball/Race Contact Area
Minimum Ball Deformation
Less Friction
More Rigid
Less Wear
Lower Operating Temperature |
| Young's Modulus (Gpa) |
206 |
314 |
| Poisson's Ratio |
.30 |
.29 |
| Magnetism |
Ferromagnetic |
Non-Magnetic |
Reduced Torque in Strong Magnetic Field |
| Conductivity |
Conductive |
Non-Conductive |
No Electrical Arcing Through Balls
Less Wear
Reduced Race Way Pitting and
Fluting |
| Corrosion Resistance |
Not Good |
Excellent |
Less Wear
Harsh Environment Durability
Longer Life |
| Metallic Ring Properties |
| Ring Material |
Hardness |
Young's Modulus
GPa |
Coefficient of linear expansion 10 |
Load Properties |
Gas Emission |
Comments |
Temp Capabilities |
| High Carbon Chrome Bearing Steel |
61 HRC |
208 |
12.5 |
Very Good |
Very Good |
Standard Material |
300 Deg. F
(148 Deg. C) |
Stainless Steel
(440 C) |
60 HRC |
208 |
10.5 |
Very Good |
Very Good |
Recommended Corrosion Resistance |
350 F
(176 Deg. C) |
| High Speed Tool Steel (M50) |
61 HRC |
207 |
10.6 |
Very Good |
Very Good |
Available in limited sizes |
800 F
(426 Deg. C) |
| Seals and Shields |
| Material |
Comments |
Temperature Range |
| Buna Rubber |
Standard Rubber Seals
Excellent Sealing |
-20 to 200 F |
| Fluorocarbon (VITON®) |
Excellent Chemical
Resistance,
High Temp. |
-40 F to 400 F |
| PTFE Seals (TEFLON®) |
Superior Chemical and
Heat Resistance,
Fiberglass Base |
-450 to 550 F |
| Metal Shield |
Not a Seal, Primarily
Lube Containment, High
Temperature |
450 F |
| Retainer Materials |
Retainer
Material |
Temp. (ºF) |
Speed (dN) |
Out gassing |
Particle Generation |
Cost |
| PEEK |
480 |
800,000 |
Excellent |
Excellent |
Moderate |
Vespel®
(SP-1) |
500 |
600,000 |
Excellent |
Excellent |
High |
| Nylon |
200 |
300,000 |
Good |
Good |
Low |
| Teflon® |
500 |
75,000 |
Good |
Good |
Low |
| Phenolic |
300 |
600,000 |
Poor |
Poor |
Low |
| Torlon |
450 |
750,000 |
Excellent |
Excellent |
Moderate |
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