Sintered alumina 99.7%

Alumina 99.7% sintered ceramic

Final Advanced Materials provides high temperature Alumina Al2O3 sintered ceramics. We can provide rods, plates or machine parts according to your drawings.


Sintered ceramic presentation


Aluminium oxide (Al2O3) is the most important technical sintered oxide ceramic material and has the widest range of applications. Densely sintered aluminium oxide is characterised by :

  • High strength and hardness
  • Temperature stability
  • High wear resistance and corrosion resistance even at high temperatures


These synthetically manufactured materials with aluminium oxide contents ranging from 80 % to more than 99 %, have been proven in practice. The choice of this material is determined by technical and economic criteria. A material with higher aluminium oxide content does not necessarily fulfil the needs of an application best.

Aluminium oxide materials satisfy all the requirements of insulation materials for applications in electrical engineering. Values for bending strength and for resistance to wear and to high temperatures suit the material to mechanical applications.



Sintered ceramic applications



Due to their good price/performance ratio and their generally useful properties, aluminium oxide ceramics are used in :

  • The sanitary industry as a sealing element
  • Electrical engineering as insulation
  • Electronics as a substrate
  • Machine and plant construction as wear protection (wear-resistant material)
  • Chemical industry as corrosion protection (corrosion-resistant material, highly resistant to vapours, melting
  • Protective tube for thermocouples used for high temperature measurements
  • High temperature applications as a burner nozzle or as a support tube for heat conductors

Characteristics tables

Properties

Units

Alumina

Zirconia

Silicon carbide

Boron nitride

Aluminium nitride

Silicon nitride

Aluminium titanate

Reference N°

 

055-0010

055-0020

055-0021

103-0010

200-0090

055-0030

103-0020

036-0010

Purity

 

Al2O3 99,7%

ZrO2-Y2O3

ZrO2-MgO

SSiC

BN HD

AlN

Si3N4

Al2TiO5

Classification DIN ISO

 

C779

C800

C800

-

-

C910

C935

-

Characteristics table

Density

g/cm3

3.9

6

5.6

> 3.1

2.2

3.3

3.18 to 3.4

3.35

Open Porosity

%

0

0

0

0

0

0

0

12.5

Colour

 

ivory

white

yellow

black

white

grey

grey

ivory

Mechanical characteristics 20°C

Hardness Vickers HV10

N/mm2

> 17 000

> 12 000

> 10 000

> 25 000

-

> 10 500

15 200

< 2000

Compression strength

N/mm2

2 500

> 1800

> 1800

> 2 500

142

> 2000

3 000

-

Flexural strength

N/mm2

> 370

> 600

> 600

> 400

45

> 350

769

25

Elasticity modulus

GPa

> 380

> 200

> 200

400

-

> 320

290

17

Toughness

MPa.m1/2

4

7

8

3.5

 

> 3

7.5

-

Weibull Modulus

 

15

20

16

10

 

-

25

-

Thermal characteristics

Max. operating temperature

°C

1700

1000

1000

1900 (1600 on air)

1400 (850 on air)

1000

1400

1500

Specific heat 20°C

J/kg.K

900

400

400

670

-

-

700

-

Thermal conductivity 100°C

W/mK

30

2.5

3

125

47

180

25

1.4

Thermal expansion 20 to 1000°C

10-6/K-1

8.5

11

11

4.5

5.85

4.6

3.2

< 1

Electrical characteristics

Specific resistivity 20°C

Ω.m

1012

1012

> 10 7

10-3 to 106

1012

> 1010

1012

1012

Specific resistivity 600°C

10 6

> 10 3

> 10 3

-

 

-

-

-

Dielectric strength

kV/mm

17

-

-

-

19.6

15

-

-

Do not hesitate to contact us for more information, for the design and machining of your parts.

Sintered technical ceramics (813.69k)

Data Sheet: Sintered technical ceramics