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High voltage resistant insulation ceramic parts for new energy industry
Alumina Ceramic
The applications for alumina advanced ceramics are heavy-duty forming tools, substrates and resistor cores in the electronics industry, tiles for wear protection and ballistics, thread guides in textile engineering, seal and regulator discs for valves, heat-sinks for lighting systems, protection tubes in thermal processes or catalyst carriers for the chemicals industry.
Alumina ceramic 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.Alumina ceramic is generally white but may
also be pink or ivory.The color is derived from either the
sintering additives or impurities in the raw materials.
Features & Advantages
1. High hardness.
2. High heat resistance: alumina ceramic has excellentthermal
stability,which means that it is widely used in areas where
resistance to high temperatures is essential.
3. Good wear resistance: alumina ceramic is the material of choice
for alumina wear parts.
4. High electrical resistivity: alumina is an electrically
insulating material.
5. High corrosion resistance: it is insoluble in water and only
slightly soluble in strong acid and alkaline solutions. Good
chemical stability of alumina leads to high corrosion resistance.
Properties | Unit | Steatite ceramic | 95% Al2O3 | 99% Al2O3 | Zirconia Ceramic |
Density | g/cm³ | 2.8 | 3.6 | 3.8 | 5.6 |
Flexural strength | Mpa | 145 | 300 | 300 | 354 |
Max Working Temperature | ℃ | 1100 | 1400 | 1600 | 1400 |
Sintering temperature | ℃ | 1350 | 1700 | 1750 | 1550 |
Heat resistance | T(℃) | 200 | 220 | 200 | 350 |
Hardness | Gpa | 5.7 | 7 | 10.7 | 12.3 |
Elastic modulus | Gpa | 120 | 275 | 320 | 205 |
Poissons ratio | - | 0.21 | 0.22 | 0.22 | 0.30 |
Linear expansion coefficient | x 10-6/℃ | 7.9 | 7.1 | 7.8 | 9 |
Insulation breakdown Intensity | KT/mm | 10 | 16 | 18 | 15 |
Thermal conductivity | w/(m.k) | 2.5 | 20 | 25 | 2.5 |
Specific Heat | *10-3J/(kg*K) | 0.75 | 0.78 | 0.78 | 0.4 |