ceramic ring
1) Classification: 95%AL203,
2) Colors: white, beige, red, black,
3) Porosity: <=0.5
4),free for sample
Alumina ceramic mechanical seal
Alumina ceramic seal faces have the property of the resistant-high-temperature,resistant-corrosion,resistant-wearing and good sealing.
Application:
It widely used in spacecraft,machinery,metallurgy,printing and dyeing, foodstuff, pharmaceutical, auto industry and so on
Name | Unit | Alumina | |
Content | % | ≥95 | ≥99 |
Density | g/cm3 | 3.70 | 3.80 |
Hardness (Hv0.5) | GPa | 13.1 | 15.0 |
Poisson’s ratio |
| 0.23 | 0.23 |
Max use temperature | °C≥ | 1600 | 1600 |
Thermal expansion coeff | ×10-6/°C(40-800°C) | 7.8 | 8.0 |
Thermal conductivity | W/m·K( 20°C) | 22 | 28 |
Thermal shock resistance(in water) | °C | 200 | 200 |
Dielectric loss angle (1MHz) | ×10-4 | 4 | 2 |
Dielectric Constant (1MHz) |
| 9.2 | 9.8 |
Nitric Acid (60%)90°C | WT Loss mg/cm2/day≤ | 0.12 | 0.10 |
Caustic Soda (30%)80°C | WT Loss mg/cm2/day≤ | 0.53 | 0.26 |
flexural strength | MPa≥ | 340 | 310 |
Elasticity | GPa | 300 | 330 |
dielectric strength | V/m | 15×106 | 15×106 |
Ra | μm | 0.1-0.3 | 0.1-0.3 |
Mr | % | 60-80 | 60-80 |
Flatness | < | 0.0009 | 0.0009 |
Stomata number | < | 2 | 2 |
Stomata size | mm< | 0.1 | 0.1 |
section | cm2 | 5-10 | 10-30 |
