Ceramic Bearing vs. Steel Bearing Material Comparison Chart
Ceramic Bearing vs. Steel Bearing Material Comparison Chart
| Item | Unit | Si3N4 | ZrO2 | Al2O3 (99.5%) | SiC | Bearing Steel |
| Density | g/cm3 | 3.23 | 6.05 | 3.92 | 3.12 | 7.85 |
| Coefficient of Friction | MPa•m1/2 | 0.0010 | 0.0012 | |||
| Water Absorption | % | 0 | 0 | 0 | 0 | 0 |
| Coefficient of Linear Thermal Expansion | 10-6/k | 3.2 | 10.5 | 8.5 | 3 | 12.5 |
| Modulus of Elasticity (Young’s Mod.) | GPA | 300 | 210 | 340 | 440 | 208 |
| Poisson’s Ratio | / | 0.26 | 0.3 | 0.22 | 0.17 | 0.3 |
| Hardness (Hv) | MPa | 1500 | 1200 | 1650 | 2800 | 700 |
| Flexural Strength (@ R.T.) | MPa | 720 | 950 | 310 | 390 | 520 (tensile strength) |
| Flexural Strength (700°) | MPa | 450 | 210 | 230 | 380 | / |
| Compressive Strength (@R.T.) | MPa | 2300 | 2000 | 1800 | 1800 | / |
| Fracture Toughness, Kb | MPa*m1/2 | 6.2 | 10 | 4.2 | 3.9 | 25 |
| Thermal Conductivity (@R.T.) | W/m*k | 25 | 2 | 26 | 120 | 40 |
| Electrical Resistivity (@R.T.) | Ω*mm2/m | >1013 | >1015 | >1016 | >103 | 0.1~1 |
| Max. Use Temperature (no loading) | °F | 1050 | 750 | 1500 | 1700 | 300 |
| Corrosion Resistance | / | Excellent | Excellent | Excellent | Excellent | Poor |