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Structural ceramic material

 

 

 

Alumina characteristic

Zirconia/Silicon carbide/Steatite/Cordierite characteristic

 

Material advantages

 

Alumina Material Advantages:
Alumina ceramic is featured with the same crystal structure as sapphire and ruby after sintering process. This material is applied to widely diversified industrial field for its superb material characteristics such as high electrical insulation, high mechanical strength, high wear and chemical resistance.

 

Zirconia Material Advantages:
Excellent Strength and High Fracture Toughness:Zirconia is able to absorb the energy of impact that causes ceramic materials to shatter.
Surface Finish: Zirconia is a highly polishable material that can achieve a 2-4 microinch Ra.
Wear Resistant: Zirconia outperforms conventional components in demanding corrosive, abrasive, and erosive environments.

 

Silicon Carbide Material Advantages:
Silicon carbide maintains its high mechanical strength up to as high temperature as 1,400 degree. Typical application is part for mechanical seal ring and pump due to higher chemical corrosion resistance than other ceramics.

 

Alumina characteristic

Material

Item

Alumina

Alumina content

92%

96%

97%

99%

995%

Color

white

white/red

brown

white

white

Ivory

Density

g/cm3

3.6

3.65

3.7

3.7

3.8

3.85

Water absorption

%

0

0

0

0

0

0

Vickers Hardness
Load 5kg

 

900

1000

1100

1200

1500

1500

Flexural strength

MPa

340

350

350

360

360

370

Young’s Modulus of Elasticity

GPa

270

310

310

340

350

360

Coefficient of Linear

thermal expansion(40-800)

10ˆ-6/℃

8.2

8.2

8.2

8.2

7.9

7.8

Thermal conductivity

w/(m·k)

15

22

23

24

27

30

Specific heat

KJ/(kg·k)

0.78

0.78

0.78

0.78

0.78

0.78

Dielectric strength

10ˆ6v/m

14

15

13

14

14

14

Dielectric constant

--

8.9

9.2

9.0

9.4

9.7

9.7

Main applications

 

 

Electric ceramic

structural ceramic

Ceramic disc
Weld ceramic
Laser ceramic

Electronic ceramic

Ceramic disc
Sealing parts
Pump plunger

Wear parts

Structural ceramic

Precision ceramic
Textile ceramic

Ceramic crucible
Laser ceramic

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Zirconia/Silicon carbide/steatite/cordierite characteristic:

Material

Item

Zirconia

Silicon carbide Steatite Cordierite

Color

white/black

black

white/canary white/yellow

Density

g/cm3

6.0

3.65

2.8 2.6

Water absorption

%

0

0

0 0

Vickers Hardness Load 5kg

 

1200

1300

- -

Flexural strength

MPa

900

400

- -

Young’s Modulus of Elasticity

GPa

200

400

- -

Coefficient of Linear

thermal expansion(40-800)

10-6/℃

11

4.4

8.0 1.5

Thermal conductivity

w/(m·k)

3

60

3 4

Specific heat

KJ/(kg·k)

0.46

0.67

0.73 0.73

Dielectric strength

10ˆ6v/m

-

-

18 19

Dielectric constant

--

-

-

6 4.8

Main applications

 

 

Precision ceramic

Sealing parts

Structral ceramic

Crucible

Pad printer ring

 

Sealing parts

Nozzle

Electronic ceramic

Lighting head

light holder

igniter

Welding ferrule

Refractory

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