Aluminum oxide-based ceramic products (Al2O3)

Aluminum oxide is indispensable in the manufacture of corrosion-resistant, wear-resistant, electrical insulation and heat-resistant products for a wide variety of industries.
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Description
Specifications

Key properties of aluminum oxide (Al2O3):

  • High hardness
  • High thermal conductivity
  • High corrosion resistance
  • Low density
  • Robustness at high temperatures
  • Electric insulation properties
  • Low cost in comparison with other ceramic materials

The main areas of use from corundum (aluminum oxide):

  • Facing of consumable hardware;
  • End seal rings;
  • Drain bushings, wiring, guiding beams;
  • Roller balls;
  • Milling fittings;
  • Burners;
  • Crucibles;
  • Valve components and shut-offs;
  • Nozzles for argon arc welding machines;
  • Electric insulators;

There are few modifications of aluminum oxide depending on the main phase of impurities that differ in strength and chemical stability.

 

Al2O3, % 60 75 80 85 92 95 99 99.7
Density, g/cm3

3.0

3.1

3.3

3.4

3.6

3.7

3.81

3.85

Flexural strength, MPa

205

280

215.7

230

312

304

340

370

Linear thermal expansion coefficient, (25-800оС), 10-6/оС

7.1

7.6

7.6

7.6

7.5

7.3

7.6

7.6

Dielectric strength, kW/mm

10

10

10

10

10

10

10

10

Specific electric resistance

20°С ,Ω•сm

300°С,Ω•сm

>1014

>1013

>1014

>1013

>1014

>1013

>1014

>1013

>1014

>1013

>1014

>1012

>1014

>1010

>1014

>1010

Operating temperature, оС 

1350

1000

1250

1290

1390

1480

1600

1700

Mohs hardness

7.5

7.5

7.5

7.5

8.5

8.8

9.0

9.0

Heat resistance, оС 

1800

1700

1800

1850

1920

2000

2030

2040

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