HT- Alumina ceramic eye/ceramic eyelets
HT- Alumina ceramic eye/ceramic eyelets
1.Product description
Alumina is the most mature of the engineering ceramics, offering excellent electrical insulation properties together with high hardness and good wear resistance but relatively low strength and fracture toughness.
During the prodcution, small amounts of silica (SiO2), magnesia (MgO) and zirconia (ZrO2) may be added to alumina ceramics. The applications vary with the purity of Alumina. 99% Alumina Ceramics are mostly used for high temperature crucibles, kiln furniture, special abrasion resistant parts, such as ceramic bearings, ceramic sealings or faucet discs; 95% Alumina Ceramics are usually applied for corrosion-resitant components or wear proof parts; 85% Alumina Ceramis can be metallized with metals like molybdenum, niobium, tantalum to use for electric vacuum devices.
Properties of Alumina Ceramics
Alumina has a high melting point, high hardness and high mechanical strength, although mechanical strength is reduced at temperatures above 1000° C. Due to the relatively large coefficient of thermal expansion, thermal shock resistance is reduced. Alumina is an electrically insulating material, with a high electrical resistivity, increasing with purity. Good chemical stability of alumina, leads to a high corrosion resistance. It is insoluble in water and only slightly soluble in strong acid and alkaline solution.
2.Technical Paraeter of Alumina Ceramic
Technical Parameter Of Alumina Ceramics | |||||
Item | Test condition | Unit&Symbol | 95% | 99% | 99.7% |
The Main |
|
| Al2O3 | Al2O3 | Al2O3 |
Bulk Density |
| g/cm³ | >3.6 | 3.89 | 3.96 |
Maximum Use Temperature |
| ºC | 1450 | 1600 | 1650 |
Water Absorption |
| % | 0 | 0 | 0 |
ROHS Hardness |
|
| ≥85 | ≥ 89 | ≥89 |
Flexural Strength | 20 ºC | Mpa(psi*10³) | 358(52) | 550 | 550 |
Compressive Strength | 20 ºC | Mpa(psi*10³) | 2068(300) | 2600(377) | 2600(377) |
Fracture Toughness | K(lc) | Mpa m 1/2 | 4-5 | 5.6 | 6 |
Coefficient Of Thermal Expansion | 25-1000 ºC | 1*10 -6 /ºC | 7.6 | 7.9 | 8.2 |
Coefficient Of Thermal Conductivity | 20 ºC | W/mk | 16 | 30.0 | 30.4 |
Thermal Shock Resistance | ΔTc | ºC | 250 | 200 | 200 |
Dielectricity Constant | 1MHz.25 ºC |
| 9 | 9.7 | 9.7 |
Dielectricity Strength |
| ac-kV/mm(ac V/mil) | 8.3(210) | 8.7(220) | 8.7(220) |
Volumn Resistivity | 100 ºC | ohm-cm | >10 13 | >10 14 | >10 14 |
3.Main application:
| Feature | Application | Main usage |
| 1.Great mechanical strength | Electric appliance industry Automotive industry | 1.Heat treatment furnace and toughened furnace |
| 2.High softening temperature | ||
3.Good resistance to thermal impact | ||
4.Small thermal expansion coefficient | Mechanical industry Engineer industry | 2.Inner liner tube and heating tube in electric furnace |
5.Good chill and abrupt heat properties | ||
| 6. Resistance to acid and alkali corrosion |
Generally, our warranty is one year. Within the warranty period, we can offer technique support, Feedback to you within 12 hours and help you to settle your problem controller freely.
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