Alumina oxide ceramic is a high-strength, high-corrosion-resistant, and high-wear-resistant ceramic material with alumina (Al2O3) as the main body. It is generally shaped by dry pressing or vacuum casting, sintered at high temperature, and can be machined into dimensions according to customer requirements.
Typical Application:Alumina oxide ceramics are widely used in industries such as electronic, semiconductor, chemical, iron & steel, metallurgical, petroleum, coal mining, machinery equipment, textile industry, etc.
Alumina oxide ceramics are currently categorized into two types: high-purity and regular.
High-purity alumina oxide ceramics are composed of more than 99.9% Al₂O₃. With a sintering temperature of 1650–1990°C and a transmission wavelength of 1–6μm, this type is often used to produce fused glass, serving as a substitute for platinum crucibles. Due to its transparency and resistance to alkali metal corrosion, it is also employed in the production of sodium lamp tubes. In the electronics industry, it is used as a substrate for integrated circuits and as high-frequency insulation material.
Regular alumina oxide ceramics are classified based on the Al₂O₃ content into grades such as 99%, 95%, 90%, and 85%. In some cases, materials with 80% or 75% Al₂O₃ are also included in the regular alumina ceramic series.
– 99% alumina oxide ceramics are used for manufacturing high-temperature crucibles, refractory furnace tubes, and specialized wear-resistant materials such as ceramic bearings, ceramic seals, and water valve discs.
– 95% alumina oxide ceramics are primarily utilized for corrosion-resistant and wear-resistant components.
– In 85% alumina oxide ceramics, the addition of talc enhances electrical properties and mechanical strength, allowing for sealing with metals such as molybdenum, niobium, and tantalum. Some of these ceramics are used in electric vacuum devices.
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Alumina Oxide Ceramics | |||||
Item | unit | 92 series | 95 series | 97 series | 99 series |
Al2O3 | % | 92 | 95 | 97 | 99 |
Bulk density | g/cm3 | 3.60 | 3.65 | 3.72 | 3.85 |
Bending Strength | MPa | 255 | 292 | 300 | 350 |
Compressive Strength | MPa | 2800 | 3300 | 3400 | 3600 |
Elastic Modulus | GPa | 290 | 340 | 350 | 380 |
Impact Resistance | MPam1/2 | 3.3 | 3.9 | 4.0 | 5.0 |
Mohs’ hardness | HV0.5 | 9 | 9 | 9 | 9 |
Heat-resisting Temperature | °C | 1500 | 1600 | 1600 | 1700 |
Moisture Content | % | 0 | 0 | 0 | 0 |