ALUMINA CERAMIC


Suntek Material has been supplies superior quality customized Alumina Ceramic to international market for many years.

Alumina (Al2O3) in its various degrees of purity is a versatile material that offers a combination of good mechanical and electrical properties and probably the most important oxide ceramic for widely varying technical applications. Depending on the alumina purity, particular the purity ranging from 95% to >99.7%, these aluminum oxide ceramics have variety of properties:


* Good mechanical strength 
* Good heat conductivity 
* Good fire resistance 
* Good corrosion and wear resistance 
* Good sliding properties 
* Very good electric insulation

Alumina is suitable for a wide range of applications including seal rings, laser tubes, electrical insulators, thread guides, refractory devices, electronic substrates, thermocouple tubes, grinding media and wear components. It has a good strength and stiffness, very high hardness and resistance to wear. In addition it can be readily joined to metals or other ceramics using specially developed metallising and brazing techniques.

The technical parameters of Suntek Alumina Ceramic is as follows:


Characteristics

Item

Unit

99.7% Alumina

99% Alumina

95% Alumina

 

 

 

 

 

Mechanical Characteristics

Colour

 

Iory

Light yellow

White

Density

g/cm3

3.91

3.80

3.60

Bending Strength

MPa

370

310

300

Compressive Strength

MPa

2,500

2,200

2,300

Elastic Modulus

GPa

390

340

320

Fracture Toughness

MPam1/2

4

3~4

3~4

Weber Coefficient

M

12

12

12

Vickers Hardness

HV0.5

1,800

1,600

1,400

 

 

Thermal Characteristics

Coefficient of Line Thermal Expansion

10-6K-1

7~8

7~8

7~8

Thermal Conductivity

W/mK

32

29

20

Thermal Shock Resistance (Put in Water)

T°C

280

200

250

Max Working Temperature

°C

1,700

1,600

1,500

 

 

 

Electrical Characteristics

Volume Resistance at 20°C

Ωcm

>1014

>1014

>1014

Dielectric Strength

V/m

15×106

15×106

15×106

Dielectric Constant

εr

10

10

 

One MHZ Dielectric Loss Angle at 20°C

tanδ

0.0001

0.0002

0.0004

 

Chemical Characteristics

Nitric Acid (60%) 90°C

 

 WTLossmg/cm2/day

0.05

0.10

0.10

Sulphuric Acid (95%) 95°C

0.22

0.34

0.30

Caustic Soda (30%) 80°C

0.04

0.95

0.90

 

       

 
 
 
 
       

       

If you have any question, please contact us