Alumina Seal Ceramic Rings / Industry Insulation Rings
1. Description:
Using ceramic materials to replace precious metals in swirl chamber
diesel engines can further reduce cooling devices, so the overall
cost is expected to be reduced. In the direct injection diesel
engine, the high temperature resistance of ceramic materials is
used to insert a ceramic block on the top of the piston, and the
thermal efficiency, noise and emissions are all improved. The size
and shape of the insert in the ceramic piston should be selected appropriately, otherwise due to the difference
in the thermal expansion coefficient of the material, stress will
be generated on the ceramic block, which will affect the service
life of the piston; in addition, the ceramic fiber piston made of
silicon nitride ceramic material, Because of its good wear
resistance, it can prevent aluminum alloy pistons from "cold
knocking and hot pulling" due to their large thermal expansion
coefficient.
2. Feature Advantages:
1) Refractory, High Temperature Resistance, Maximum Used
Temperature: 1800 ºC (3272ºF)
2) Hardness Strength, Wear Resistance Up To Mohz 9.0 ; HRA 80-90
3) High Voltage, Good Insulation Performance ,Electrical
Resistivity Up To 10∧14 Ohm.Cm
4) High Polished Surface Up To Rz0.8(Ra0.1)
5) Superior Mechanical Strength, MAX 10 MPa.m1/2 Fracture toughness
6) Pressure Resistance, Max 2300MPa compressive strength
7) Anti-High Corrosion Resistance, Such As Acid Alkali Resistance
8) Long Service Life
9) Other excellent property
3. Material Features / Properties:
| Composite | (wt %) | 99% | 99.5% | 99.8% |
| Color | | White or Ivory | White or Ivory | White or Ivory |
| Density | g/cm 3 | 3.82 | 3.9 | 3.92 |
| Hardness | HRA | 83 | 85 | 85 |
| Flexural Strength | Mpa (psi*10 3 ) | 375 | 386 | 381 |
4. Technical Parameters:
| Technical Parameters of Ceramics |
| Items | Test Conditions | Unit or Symbol | 99% AL2O3 | 95% AL2O3 | 90% AL2O3 | Zirconia | Steatite | Silicon Carbide |
| Volume Density | -- | g/cm3 | ≥3.70 | ≥3.62 | ≥3.40 | ≥5.90 | ≥2.60 | ≥3.08 |
| Tightness | -- | Pa·m³/s | ≤1.0×10-11 | ≤1.0×10-11 | ≤1.0×10-11 | - | - | - |
| Liquid Permeability | -- | -- | Pass | Pass | Pass | | Pass | - |
| Flexural Strength | - | MPa | ≥300 | ≥280 | ≥230 | ≥1100 | ≥120 | ≥400 |
| Elastic Modulus | - | GPa | - | ≥280 | ≥250 | ≥220 | - | 400 |
| Poisson Ratio | - | - | - | 0.20～0.25 | 0.20～0.25 | - | - | - |
| Thermal Shock Resistance | 800℃( Room Temperature) Cycle: 10 times | | Pass | Pass | Pass | - | - | - |
| Coefficient of Linear Expansion | 20℃～100℃ | ×10-6 K-1 | - | - | - | | ≤8 | - |
| 20℃～500℃ | ×10-6 K-1 | 6.5～7.5 | 6.5～7.5 | 6.5～7.5 | 6.5～11.2 | - | - |
| 20℃～800℃ | ×10-6 K-1 | 6.5～8.0 | 6.5～8.0 | 6.3～7.3 | | - | 4 |
| 20℃～1200℃ | ×10-6 K-1 | - | 7.0～8.5 | - | - | - | - |
| Coefficient of Thermal Conductivity | 20℃ | W/(m·k) | - | - | - | - | - | 90～110 |
| 1000℃ |
| Dielectric Constant | 1MHz 20℃ | - | 9.0～10.5 | 9.0～10 | 9.0～10 | - | ≤7.5 | - |
| 1MHz 50℃ | - | - | 9.0～10 | - | - | - | - |
| 10GHz 20℃ | - | 9.0～10.5 | 9.0～10 | 9.0～10 | - | - | - |
| Volume Resistivity | 100℃ | Ω·cm | ≥1.0×1013 | ≥1.0×1013 | ≥1.0×1013 | - | ≥1.0×1012 | - |
| 300℃ | ≥1.0×1013 | ≥1.0×1010 | ≥1.0×1013 | - | - | - |
| 500℃ | ≥1.0×109 | ≥1.0×108 | -- | - | - | - |
| Disruptive Strength | D.C | kV/mm | ≥17 | ≥15 | ≥15 | - | ≥20 | - |
| Chemical Durability | 1:9HCl | mg/c㎡ | ≤0.7 | ≤7.0 | - | - | - | - |
| 10%NaOH | mg/c㎡ | ≤0.1 | ≤0.2 | - | -- | - | - |
| Grain Size | - | μm | - | 3~12 | - | - | - | - |
5. Process Flows:
Formulating --- Granulating --- Forming --- Sintering --- Grinding
--- Printing --- Nickel Plating --- Assembing --- Brazing ---
Inspecting --- Packing
6. Production Facilities: Prilling Tower , Forming Machine , High
Temperature Sintering Kiln
7. Detection Devices:
Electric Performance Tester , Film Thickness Analyzer ,
Granulometer , Helium Mass Spectrometer Leak Detector , Universal
Pull Force Meter
8. Our advantages: Quality Assurance ; Price Competitive ; Factory Supply Directly ;
Good Service
9. Shipping and Package:
10. Our aimed market:
Notes:Above information only for reference and please contact with
us for more details freely when you have any inquiry!
