|
Comparison of performance data on basic materials of Si3N4, ZrO2, Al2O3 and Steel | Item | Unit | Steel | Si3N4 | ZrO2 | Al2O3 | | Density | g/cm3 | 7.85 | 3.20~3.30 | 6.05 | 3.95 | | Coefficient of thermal expansion | 10-6/k | 10.0 | 3.2 | 10.5 | 9.1 | | Elastic modulus | GPa | 208 | 300~320 | 210 | 380 | | Poisson's ratio | ? | 0.30 | 0.26 | 0.30 | 0.27 | | Hardness | (HV) | 700 | 1500~1800 | 1200 | 1800 | | Hardness | (HRC) | 62 | 75~80 | 70 | 80 | | Flexural strength | MPa | 2400 | 200 | 300 | 220 | | Compressive strength | MPa | --- | 1400 | 2100 | 1500 | | Fracture toughness | MPa?m1/2 | 25.0 | 6.0~7.0 | 10.0 | 3.5 | | Thermal conductivity | W/mk | 30~40 | 18 | 2 | 25 | | Specific resistivity | ??mm2/m | 0.1~1 | 1018 | 1015 | 108 | | Max. temperature of application | ? | 300 | 800 | 550 | 1850 | | Acid, base & corrosion resistance | ? | Weak | Strong | Strong | Strong | | No. of stress cycle | No | 107 | 107~109 | 105 | ? | | Size stability | ? | Greater change with temperature | Less change with temperature | ? | ? | | Rotational centrifugal force | ? | Large | Small | Larger | Medium | | Lubricant amount | ? | Yes | No | No | No | | Magnetic property | ? | Yes | No | No | No | | Format of rolling contact fatigue | ? | Detached | Detached | Cracked | Cracked |
Note: The Poisson's Ratio (?) is the size ratio for lateral and longitudinal deformation of sample under tension. For construction glass, the ? = 0.22. For detailed experimental data, please call Mr. Wang at +886-3-3265168
|
