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Alumina Beads
Final Advanced Materials supplies three varieties of ceramic beads: two in alumina and one in zircon oxid. These beads are distinguished by their high degree of adaptability to challenging environments and their exceptional strength characteristics. These beads are highly rated in the watchmaking, medical and automobile sectors.
Manufacturing
Ceramic is produced from a chemical composition based upon several oxidized raw materials. The resulting powder is compacted, then moulded by dry pressing. The moulding is then sintered at high temperature to develop its polycrystalline ceramic structure.
Applications of Alumina Beads
- High-precision and high-speed ball bearings
- Hip replacements
- Valves or relief valves
- Measuring devices
- Reference spheres for three-dimensional measuring machines
- Probes for three-dimensional measuring machines
Benefits of Alumina Beads
- Exceptional hardness
- Strong resistance to friction and wear
- High elastic modulus
- High chemical, thermal and mechanical resistance
- Strong electrical insulating properties
- Low porosity
99.7 % Alumina Oxide
The 99.7 % alumina oxide beads are very resistant to wear, heat and corrosive environments. They retain good dimensional stability up to 1,000 °C. Alumina resists oxidation and is tolerant to water, salt solutions and many chemicals and acids.
Technical Data of 99.7 % Alumina Oxide Beads
|
Property |
Unit |
Pure Alumina Oxide Beads |
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|
Item N° |
055-0100 |
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|
Diameter |
mm |
from 0.40 to 3.30 |
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|
Composition |
Al2O3 |
Wt % |
99.7 |
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|
MgO |
0.15 |
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|
Others |
0.15 |
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|
Colour |
off white |
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|
Surface Finish |
silky, smooth, shiny |
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|
Density |
g/cm3 |
3.95 ±0.05 |
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|
Bulk Density |
kg/l |
2.35 ±0.05 |
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|
Porosity |
Nil |
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|
Water Absorption |
Nil |
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|
Hardness on Mohs’ Scale |
9+ |
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|
Hardness on Vickers’s Scale (HV5) |
1,600 |
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|
Crushing Strength (Ø 2 mm) |
N |
980-1,078 |
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|
Bead Sphericity 90 % |
≥ 0.95 |
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|
Max. Operating Temperature |
°C |
1,750 |
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|
Thermal Expansion Coefficient from 20 to 1,000 °C |
10-6K-1 |
8.4 |
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92 % Alumina Oxide
The composition of these beads differs slightly from that of previous spheres of pure alumina, with a reduced alumina content of 92 %. As a result, these spheres are more cost-effective. This product is also distinguished by increased abrasiveness and reduced thermal output.
Technical Data of 92 % Alumina Oxide Beads
|
Property |
Unit |
92 % Alumina Oxide Beads |
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|
Item N° |
055-0110 |
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|
Diameter |
mm |
from 0.40 to 3.30 |
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|
Composition |
Al2O3 |
Wt % |
92.3 |
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|
SiO2 |
2.55 |
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|
MgO |
2.45 |
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|
CaO |
2.10 |
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|
Others |
0.60 |
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|
Colour |
white |
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|
Surface Finish |
abrasive |
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|
Density |
g/cm3 |
3.70 ±0.05 |
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|
Bulk Sensity |
kg/l |
2.20 ±0.05 |
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|
Porosity |
Nil |
|||||||||||
|
Water Absorption |
Nil |
|||||||||||
|
Hardness on Mohs’ Scale |
9+ |
|||||||||||
|
Hardness on Vickers’s Scale (HV5) |
1,300 |
|||||||||||
|
Crushing Strength (Ø 2 mm) |
N |
882-980 |
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|
Bead Sphericity 90 % |
≥ 0.95 |
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|
Max. Operating Temperature |
°C |
1,400 |
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|
Thermal Expansion Coefficient from 20 to 1,000 °C |
10-6K-1 |
7.6 |
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Physical variables included in this documentation are provided by way of indication only and do not, under any circumstances, constitute a contractual undertaking. Please contact our technical service if you require any additional information.