Beads: Alumina

Alumina Al2O3 beads

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

Item N° 

055-0100

Diameter

mm

from 0.40 to 3.30

Composition

Al2O3

Wt %

99.7

MgO

0.15

Others

0.15

Colour

off white

Surface Finish

silky, smooth, shiny

Density

g/cm3

3.95 ±0.05

Bulk Density

kg/l

2.35 ±0.05

Porosity

Nil

Water Absorption

Nil

Hardness on Mohs’ Scale

9+

Hardness on Vickers’s Scale (HV5)

1,600

Crushing Strength (Ø 2 mm)

N

980-1,078

Bead Sphericity 90 %

≥ 0.95

Max. Operating Temperature

°C

1,750

Thermal Expansion Coefficient from 20 to 1,000 °C

10-6K-1

8.4

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

Item N° 

055-0110

Diameter

mm

from 0.40 to 3.30

Composition

Al2O3

Wt %

92.3

SiO2

2.55

MgO

2.45

CaO

2.10

Others

0.60

Colour

white

Surface Finish

abrasive

Density

g/cm3

3.70 ±0.05

Bulk Sensity

kg/l

2.20 ±0.05

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

Bead Sphericity 90 %

≥ 0.95

Max. Operating Temperature

°C

1,400

Thermal Expansion Coefficient from 20 to 1,000 °C

10-6K-1

7.6

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.

Ceramic Beads (207.03k)

Data Sheet: Ceramic Beads