Alumina, or aluminum oxide Al2O3, with a molecular weight of 102, is the major source of aluminium in nature. Normal Al2O3 products have a very high melting point, which is 2,072℃. Advanced Ceramic Materials (ACM) offers numerous ceramic materials and formulations, each exhibiting unique and excellent performance characteristics, including resistance to:
• High temperatures
• Mechanical wear and tear
• Corrosive environments
Alumina ceramic is the most common technical ceramic material and a relatively traditional material. High-purity aluminum oxide ceramics as a fine ceramic material is widely used in a lot of industries. This material has superb performances in electrical insulation, high thermal conductivity, high chemical resistance, good wear resistance, and low thermal expansion.
ACM offers Alumina Ceramics satisfying a wide range of customer requirements and applications. Various alumina grades and alumina purities in both porous and non-porous varieties are available. The main Applications of Alumina Ceramics are as follows:
| · Industrial appliances | · Coatings |
| · Labware | · Engineered Ceramics |
| · Refractories | · Artificial bones |
| · Abrasives | · Consumer electronics |
Alumina tubes are used for industrial furnaces and thermal couple protectors. High-purity alumina materials are excellent for making parts for CVD, ion implants, photolithography, and semiconductor parts.
In traditional industries, alumina ceramics are ideal for products such as injector tubes, gas nozzles, and insulators.
Compared with metals, alumina ceramic material is extremely hard, making it an ideal material for abrasive, grinding media.
Alumina mortars and pestles are widely used in laboratories for grinding hard materials.
Alumina Ceramics have excellent biocompatibility, high strength, and high wear resistance. So, they are also ideal materials for the preparation of artificial bones and artificial joints.
ACM's production formulations are developed to address the varied application problems in which ceramic components are commonly used. Many industrial applications push the envelope on specific requirements leading to the development of new formulations to successfully address them.
| Property | Unit | Standard | A998 | A96 | A9468 |
| Al2O3 Composition | weight % | 99.80% | 95.80% | 94% | |
| Bulk Density | g/cm3 | ASTM 2320 | 3.89 | 3.72 | 2.6 |
| Porosity | volume % | ASTM D4404 | 0% | 0% | 30% |
| Grain Size | micron, μm | ASTM E112 | 4 | 3 | 4 |
| Color | Ivory | White | White | ||
| Mechanical Properties | |||||
| Hardness, Vickers | GPa | All 5 kg U.O.S. | 11.1 | 10.61 | 2.3 (1 kg) |
| 4-point Bend | MPa | ASTM C1161 | 325 | 325 | 119 |
| Strength (MOR) | |||||
| K1C | ksi | ASTM C1421 | 47 | 6.7 | 3.7 |
| Thermal Properties | |||||
| Service | ℃ | No Load | 1650 | 1500 | 1550 |
| Temperature (in Air) | Cond. | ||||
| Coefficient | °C-1 (25-1000°C) | ASTM C372 | 7.5 x 10-6 | 8.2 x 10-6 | 8.2 x 10-6 |
| of Thermal | |||||
| Expansion (CTE) | |||||
| Thermal | W/m·°K | ASTM C408 | 35 | 25 | 22.4 |
| Conductivity | |||||
| (20°C) | |||||
| Electrical Properties | |||||
| Dielectric | Volts/mil | ASTM D149 | 200 | 229 | 210 |
| Strength | |||||
| Dielectric | @1MHz @ 20°C | ASTM D150 | 10 | 9.3 | 9 |
| Constant | |||||
| Volume | Ohm·cm @ 25°C | ASTM D1829 | >1014 | >1014 | >1014 |
| Resistivity | Ohm·cm @ 300°C | ASTM D1829 | >1011 | >109 | >109 |
| Ohm·cm @ 500°C | ASTM D1829 | >108 | 106 | >105 | |
| Properties | Unit | Fused Alumina | Reactive Grade Alumina | Ready To Press Alumina (RTP Alumina) | Activated Alumina | |||||||
| Al2O3 Content | % | 95.5 | 99.8 | 98 | 96 | 94 | 92 | 90 | ||||
| Bulk Density | g/cm3 | 3.95 | ~600 | ~1000 | ~600 | ~1100 | ~900 | ~1200 | ~1100 | – | ||
| Grain Size | μm | Customized | Customized | ≈130 | ≈170 | ≈100 | ≈200 | customized | ||||
| Color | – | White | White | White | White | |||||||
| Melting Point | ℃ | 2000 | – | – | – | |||||||
| Hardness | Mohs | 9 | – | – | – | |||||||
| Specific Surface Area | m2/g | – | 0.2-0.5 | 3.5-5 | 2-3 | 6-9 | 6-10 | – | 200-260 | |||
Advanced Ceramic Materials (ACM) is a leading supplier of alumina ceramic products of the highest quality for a wide range of applications. We are happy to provide advice on materials, design, and application. Feel free to contact us with any questions about Al2O3 or other ceramic materials that are not listed on the website.
