Aluminum Oxide (Alumina)
Material Information
Specifications
| General Properties | Alumina 96% | Alumina 99.5% | Alumina 99.8% |
|---|---|---|---|
| Density - gm/cc | 3.72 | 3.9 | 3.92 |
| Crystal Size (Average) - Microns | 6 | 6 | 6 |
| Water Absorbtion (Open Porosity) - % | 0 | 0 | 0 |
| Gas Permeability - % | 0 | 0 | 0 |
| Color | White / Pink | Ivory | Ivory |
| Mechanical Properties | Alumina 96% | Alumina 99.5% | Alumina 99.8% |
|---|---|---|---|
| Flexural Strength (MOR) 20°C - Mpa (psi x 10³) | 358 (52) | 379 (55) | 375 (54) |
| Elastic Modulus 20°C - GPa (psi x 10⁶) | 303 (44) | 370 (54) | 370 (54) |
| Poisson’s Ratio 20°C | 0.21 | 0.22 | 0.22 |
| Compressive Strength 20°C - MPa (psi x 10³) | 2068 (300) | 2600 (377) | 2500 (363) |
| Hardness - GPa (kg/mm²) | 11.5 (1175) | 14.1 (1440) | 14.1 (1440) |
| Hardness - R45N | 78 | 83 | 83 |
| Tensile Strength 25°C - MPa (psi x 10³) | 221 (32) | 262 (38) | 248 (36) |
| Fracture Toughness K(I c) - mpa m½ | 5-Apr | 4.5 | 5-Apr |
| Electrical Properties | Alumina 96% | Alumina 99.5% | Alumina 99.8% |
|---|---|---|---|
| Dielectric Strength 6.35mm - ac-kV/mm (ac V/mil) | 8.3 (210) | 8.7 (220) | 8.7 (220) |
| Dielectric Constant 1 MHz - 25°C | 9 | 9.7 | 9.8 |
| Dielectric Loss (tan delta) 1 MHz - 25°C | 0.0002 | 0.0001 | <0.0001 |
| Volume Resistivity 25°C - ohm-cm | >10 | ||
| Volume Resistivity 500°C - ohm-cm | |||
| Volume Resistivity 1000°C - ohm-cm |
| Thermal Properties | Alumina 96% | Alumina 99.5% | Alumina 99.8% |
|---|---|---|---|
| Thermal Conductivity 20°C - W/m K | 24.7 | 30 | 30 |
| Coefficient of Thermal Expansion 25-1000°C - X 10-6/°C | 8.2 | 8.2 | 832 |
| Specific Heat 100°C - 880 J/kg*K | 880 | 880 | 880 |
| Thermal Shock Resistance ΔTc - °C | 250 | 200 | 200 |
| Maximum Use Temperature - °C | 1700 | 1750 | 1750 |
NOTE: The information in this data sheet is for design guidance only. Forming methods and specific geometry could affect properties.
Overview
Alumina is properly called aluminum oxide, which is a chemical compound comprised of aluminum and oxygen molecules (Al2O3). When refined from bauxite, alumina generally looks like a white powder similar to table salt or granular sugar. Aluminum oxide is typically referred to as alumina, but may also be called aloxide, aloxite or alundum, depending on the industry and the metal’s use. In addition to its use in the production of primary aluminum, aluminum oxide has other key industrial uses. Alumina is often used as a filler for plastics. The compound is also widely used as an abrasive and is a less-expensive substitute for industrial diamond. Aluminum oxide flakes produce reflective effects within the paint used on automobiles. The largest scale use of alumina occurs in refineries, where the aluminum oxide compound is used to convert dangerous hydrogen sulfide waste gases into elemental sulfur. Data provided by The Aluminum Association and Ortech Advanced Ceramics.
Applications & Usage
- Repeller Insulators
- Ceramic Fasteners
- Spindle Fork Fingers
- Ball Joints
- Dental Cements
- Toothpaste
- Sunscreen
- Abrasive component in sandpaper, grinders, polishers, and microdermabrasion
- Integrated Circuits
- Compact Fluorescent Lamps
- Reflective Paint
Industries Using This Material
Semiconductor
One of the original second source providers, Glemco has been manufacturing products in the US in support of the semiconductor industry for over 40 years. Our extensive history means that we can support the oldest legacy equipment or the newest cutting-edge implant technology, with available upgrades and enhancements to drive efficiency, reliability and performance improvements.
Semiconductor
One of the original second source providers, Glemco has been manufacturing products in the US in support of the semiconductor industry for over 40 years. Our extensive history means that we can support the oldest legacy equipment or the newest cutting-edge implant technology, with available upgrades and enhancements to drive efficiency, reliability and performance improvements.
Learn More
Machining
With a well augmented modern manufacturing facility and a highly skilled team with experience in a broad variety of materials, we offer a full suite of CNC services for production ready parts. With a broad compliment of support equipment, we offer a multi-disciplinary, turnkey option that few other manufacturers can accommodate.
Machining
With a well augmented modern manufacturing facility and a highly skilled team with experience in a broad variety of materials, we offer a full suite of CNC services for production ready parts. With a broad compliment of support equipment, we offer a multi-disciplinary, turnkey option that few other manufacturers can accommodate.
Telcom
Precisely crafted components are necessary to support this rapidly changing industry. Poor quality here can contribute to lost time around the globe. Our multi axis machining capabilities allow us to create highly accurate complex parts from a variety of high strength materials.
Telcom
Precisely crafted components are necessary to support this rapidly changing industry. Poor quality here can contribute to lost time around the globe. Our multi axis machining capabilities allow us to create highly accurate complex parts from a variety of high strength materials.
Pharmaceutical
CNC machining is critical to delivering the precision and value required for success in manufacturing pharmaceutical equipment and replacement parts. Quality, precision and efficiency are always our priorities.
Pharmaceutical
CNC machining is critical to delivering the precision and value required for success in manufacturing pharmaceutical equipment and replacement parts. Quality, precision and efficiency are always our priorities.
Energy
CNC machining technology has always been crucial in creating the complex devices that drive our energy industry. Advanced machining techniques are used to achieve the level of quality and efficiency needed to support today’s complex and varied methods of power generation.
Energy
CNC machining technology has always been crucial in creating the complex devices that drive our energy industry. Advanced machining techniques are used to achieve the level of quality and efficiency needed to support today’s complex and varied methods of power generation.
Medical
Our 5-axis high speed milling and multi-axis turning capabilities produce more accurate parts; multi-dimensional parts can be machined quickly without losing positional accuracy. With over 40 years of CNC experience in difficult to work materials and tight tolerances, Glemco is a shop you can rely on to provide the quality and precision you need.
Medical
Our 5-axis high speed milling and multi-axis turning capabilities produce more accurate parts; multi-dimensional parts can be machined quickly without losing positional accuracy. With over 40 years of CNC experience in difficult to work materials and tight tolerances, Glemco is a shop you can rely on to provide the quality and precision you need.
