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Alumina is the more common name of Aluminium Oxide (Al2O3). It is a hard-wearing technical ceramic offering an excellent combination of both mechanical and electrical properties. It is well-suited for a wide range of industrial applications.
Alumina features high hardness, wear resistance, low erosion levels, high temperature resistance, corrosion resistance, and bio-inertness. Its high temperature stability and thermal conductivity make it particularly suitable for high temperature applications such as thermocouple protection in high temperature measurement. Precision Ceramics offers a comprehensive range of advanced ceramic tubes and insulators for this purpose.
Alumina is a very hard ceramic that is excellent at resisting abrasion and is ideal for wear-resistant inserts or products.
It is commonly used as a high temperature electrical insulator, particularly the higher purity grades which offer better resistivity.
It also offers good resistance to strong acids and alkalis at elevated temperatures, which makes it ideal for applications where resistance to corrosive substances is required.
Some common applications include:
Precision Ceramics has three variations of Alumina which are CeramAlox Ultra Pure, CeramAlox 99.7 and CeramAlox 96.
The differing methods used to produce these materials resulted in slightly different properties and characteristics.
We evaluate the similarities, differences and properties of each material and it’s applications in this section.
CeramAlox 96 is a regular purity grade Alumina (Aluminium Oxide) and its one of the workhorses of the technical ceramics industry. It features a 96% purity Alumina base material providing a balanced “cost to quality” ratio. It is a hard-wearing technical ceramic offering an excellent combination of both mechanical and electrical properties and is ideally suited to a wide range of industrial applications where cost is of the essence, but the material still needs to perform adequately from a mechanical and electrical standpoint.
CeramAlox 96 can be machined in the “green state”- that is before sintering takes place, thus ensuring a large variety of shapes and sizes. CeramAlox 96 can also be diamond ground to tight tolerances in the fully sintered state using diamond grinding.
CeramAlox 99.7 it’s a high purity grade Alumina (Aluminium Oxide) and its one of the high performance grades in this range of materials.
It features a 99.7% purity Alumina base material providing a superior set of mechanical and electrical properties while maintaining a reasonable cost.
CeramAlox 99.7% is a very hard-wearing technical ceramic offering and is ideally suited to a wide range of industrial applications where mechanical and electrical performance is of the essence and the material needs to perform adequately in aggressive environments.
CeramAlox 99.7 can be machined in the “green state”- that is before sintering takes place, thus ensuring a large variety of shapes and sizes.
CeramAlox 96 can also be diamond ground to tight tolerances in the fully sintered state using diamond grinding.
| Property | Unit | 96% | 99.7% | 99.95% |
|---|---|---|---|---|
| Density | g/cm3 | 3.75 | 3.95 | 3.98 |
| Compressive Strength | MPa | 2000 | 2000 | 3500 |
| Tensile Strength | MPa | 140 | 150 | 200 |
| Flexural Strength @ 25°C | MPa | 200-300 | 250-350 | 500-600 |
| Fracture Toughness KIC | MPa m1/2 | 4.5 | 4 | 4.5 |
| Hardness | GPa | 12 | 14 | 18 |
| Young’s Modulus | GPa | 300 | 370 | 400 |
| Poisson’s Ratio | – | 0.23 | 0.23 | 0.23 |
| Property | Unit | 96% | 99.7% | 99.95% |
|---|---|---|---|---|
| Density | g/cm3 | 3.75 | 3.95 | 3.98 |
| Compressive Strength | MPa | 2000 | 2000 | 3500 |
| Tensile Strength | MPa | 140 | 150 | 200 |
| Flexural Strength @ 25°C | MPa | 200-300 | 250-350 | 500-600 |
| Fracture Toughness KIC | MPa m1/2 | 4.5 | 4 | 4.5 |
| Hardness | GPa | 12 | 14 | 18 |
| Young’s Modulus | GPa | 300 | 370 | 400 |
| Poisson’s Ratio | – | 0.23 | 0.23 | 0.23 |
* Coefficient of Thermal Expansion (CTE) describes how the size of an object changes with a change in temperature.
** Note: No load
| Property | Unit | 96% | 99.7% | 99.95% |
|---|---|---|---|---|
| Density | g/cm3 | 3.75 | 3.95 | 3.98 |
| Compressive Strength | MPa | 2000 | 2000 | 3500 |
| Tensile Strength | MPa | 140 | 150 | 200 |
| Flexural Strength @ 25°C | MPa | 200-300 | 250-350 | 500-600 |
| Fracture Toughness KIC | MPa m1/2 | 4.5 | 4 | 4.5 |
| Hardness | GPa | 12 | 14 | 18 |
| Young’s Modulus | GPa | 300 | 370 | 400 |
| Poisson’s Ratio | – | 0.23 | 0.23 | 0.23 |
Disclaimer: The values presented are mean and typical of those resulted from test samples. They are provided as an indication only to serve as guidance in the design of ceramic components and are not guaranteed in any way. The actual values can vary according to the shape and size of the envisioned component.
Precision Ceramics has three variations of Alumina which are CeramAlox Ultra Pure, CeramAlox 99.7 and CeramAlox 96.
The differing methods used to produce these materials resulted in slightly different properties and characteristics.
We evaluate the similarities, differences and properties of each material and it’s applications in this section.
All Grades CeramAlox
Alumina can be produced in a wide range of purities with additives designed to enhance its properties.
Typical purities range from 90 to 99.9% although Precision Ceramics generally works with 99.7% material.
Advanced green and biscuit machining techniques developed by Precision Ceramics allow more complex components to be manufactured using traditional machining methods. In addition, Alumina can be readily joined to metals or other ceramics using metalizing and brazing techniques.
Alumina can be machined in green, biscuit, or fully dense states.
While in the green or biscuit form, it can be machined relatively easily into complex geometries.
However, the sintering process that is required to fully densify the material causes the alumina body to shrink approximately 20%.
This shrinkage means that it is impossible to hold very tight tolerances when machining alumina pre-sintering.
In order to achieve very tight tolerances, the fully sintered material must be machined/ground with diamond tools.
In this manufacturing process, a very precise diamond coated tool/wheel is used to abrade away the material until the desired form is created.
Due to the inherit toughness and hardness of the material, this can be a time consuming and costly process.
Precision Ceramics specializes in tight tolerance and highly complex work.
We have extensive in-house machining facilities, including 4th & 5th axis machining centers, drilling, grinding, milling, polishing, sawing, tapping, threading and turning.
This allows us to manufacture Alumina components to the highest specifications.
Precision Ceramics is your Alumina machining specialist for all your technical ceramic prototyping & manufacturing needs.
We are always happy to use our many years of advanced ceramics experience to provide advice on materials, design, and application.
If you would like to buy Alumina plates, rods, tubes or custom machined components, please contact us and one of our experts will be happy to assist you.
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Ceramics, defined by the broad definition of “inorganic solids”, are one of the main classes of materials, along with metals, polymers, and composites. There are several different types of ceramics, with technical ceramics (also known as engineered ceramics or advanced ceramics) being the group with the highest performing mechanical, electrical, and/or thermal properties. Their high performance is due in part to their extremely high purities which are most commonly metal compounds combined with oxides, carbides, or nitrides. Ceramics have the ability to increase product lifespan, increase efficiency, reduce overall maintenance costs, and improve performance.
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