Alumina ceramic is kind of structural ceramics, with insulation resistance, voltage resistance, high strength, good thermal conductivity, dielectric loss, stable electrical performance characteristics. Used in electronic ceramic substrates, ceramic electrical insulation, vacuum devices, devices porcelain, spark plugs and other products. We can make the part by hot injection pressing, dry pressing, isostatic pressing and extrusion productive technology etc

Item
                                                

Unit                   

95 Al₂O₃

96 Al₂O₃

99 Al₂O₃

Physical Characteristics

Heat resistance

⁰C

1500

1550

1800

Bulk density

g/cm³

3.6

3.6

3.9

Water absorption

%

0

0

0

Mechanical Characteristics

Flexural strength              

Mpa

320

340

360

Hardness vickers

Gpa

12.2

13.5

15.6

Elastic modulus                

Gpa

280

320

370

Poisson’s ratio                     

0.22

0.23

0.23

Thermal Characteristics

Linear expansion coefficient                         

(20-500⁰C) 10^-6/⁰C

7.1

7.2

8

Thermal conductivity            

w/(m.k)

16

24

32

Specific Heat                        

*10^-3J/(kg*K)

0.78

0.78

0.9

Electrical Characteristics

Dielectric constant (1MHZ)

-

9

9.4

9.9

Dielectric loss angle

*10^-4

15

5

1

Dielectric strength             

*10⁶V/m

12

15

15