Topics Covered
Introduction
Chemical and Physical
Properties of Alumina
Applications of
Alumina Purity Grades
Recrystallized Alumina
Alumina Manufacturing
and Treatment Methods
Multi-Lab
Introduction
Aluminium
oxide is an amphoteric oxide with the chemical formula Al2O3.
It is commonly referred to as alumina, aloxide, or corundum in its
crystalline form, as well as many other names, reflecting its
widespread occurrence in nature and industry. The low cost of the raw
materials used to make alumina components makes them a popular choice
for a wide range of applications.
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Figure 1. Alumina parts and
components supplied by Multi-Lab.
Chemical and
Physical Properties of Alumina
Table 1. Chemical and
physical properties of alumina
|
| Formula |
Al2O3 |
| Density |
3.95 g/cm³ |
| Melting point |
2,072° C |
| Molar mass |
101.961 g/mol |
| Boiling point |
2,977° C |
Applications
of Alumina Purity Grades
Multi-Lab
can supply alumina in a range of purities, from 60% up to
99.7%, and recrystallized.
Alumina
is probably the most versatile industrial ceramic known to
man, due to its high electrical resistivity and very high mechanical
strength. Applications of alumina include:
- Refractories (60% purity)
- Wear applications (88% to 95% purity)
- High purity (96% to 99.7%) applications include:
- High voltage electrical substrates & insulation
- Thermocouples and sensors
- Pump parts
- Thread guides
- Feedthroughs
- Guides, foils, etc. for papermaking
- Ballistic armour
- Seal rings & valves (sliding contact)
- Laser cavities & super reflectors
- Thermal instrument parts
- Grinding media
- Printing, metalizing and chemical vapour deposition (CVD)
Recrystallized Alumina
Recrystallized alumina is one of the most important oxide ceramic
materials. It is the favoured material for a range of product types
supplied by Multi-Lab, including:
- Tubes
- Rods
- Crucibles
- Thermocouple protectors
- Insulators
- Machines Components
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Figure 2. Alumina parts and
components supplied by Multi-Lab.
Alumina
Manufacturing and Treatment Methods
Multi-Ceramic Technology, part of the Multi-Lab
group, can offer
most methods of manufacture for alumina:
- ISO pressing
- Dry pressing
- High & Low pressure injection moulding
- Freeze casting
- Extrusion
Multi-Ceramic Technology can also offer various additional treatment
methods for their alumina products, including green machining prior
to
sintering to achieve better tolerances and diamond CNC grinding to
achieve very tight limits and polished finishes.
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Figure 3. Alumina parts and
components supplied by Multi-Lab.
About Multi-Lab
Multi-Lab
is one of the leading High Purity Natural and Synthetic
Quartz Glass distributors in Europe. Multi-Lab
has always been a
defining force in the sale and fabrication of quartz glass within the
Semiconductor, Fibre Optic and Lighting industries.
They are also able to manufacture a range of components to customer
specification in various other technical ceramics such as alumina,
zirconia, silicon carbide, steatite, boron nitride, cordierite, silicon
nitride and Macor.
This information has been sourced, reviewed and
adapted from materials provided by Multi-Lab.
For more information on this source, please visit Multi-Lab.