Ceramics Properties

 

Items

Alumina

Zirconia

Steatite

Mullite

Cordierite

Main Chemical Compositions

99% AL2O3

92% AL2O3

ZrO2

MgO SiO2

3A12O3. 2SiO2

2MgO.2Al2O3. 5SiO2

Physical Properties

Density

g/cm3

3.9

3.5

6

2.8

3

2.5

Water Absorption

%

0

0

0

0

0

--

Sintering Temperature

1700

1650

---

1350

1300

1350

Mechanical Properties

Hardness

HV

1,700

1,400

1,300

800

1,000

800

Bending Strength

MPa

350

280

140

90

110

90

Compressive Strength

MPa

1200

1050

320

400

600

350

Thermal Properties

Max Working Temperature

1,500

1,400

-------

1,100

1,000

1,000

Coefficient of Thermal Expansion 0-1000O℃

/ ℃

8.0x 10^-6

7.8x 10^-6

9.5x 10^-6

6 x 10^-6

6 x 10^-6

4 x 10^-6

Thermal Shock Resistance

T( ℃ )

200

220

360

200

300

250

Thermal Conductivity

W/m.k(25
℃ ,300 ℃ )

31.4

15.9

21.8

12.6

3

----

2.5

---

4.2

---

1.3

---

Electrical Properties

Volume Resistivity 20 ℃

◎ .cm

>10^12

 >10^12

 >10^12

 >10^12

 >10^12

 >10^12

Dielectric Strength

KV/mm

18

16

-----

10

10

10

Dielectric Constant (100Mhz)

(E)

10

9.4

-----

5.8

6

6

 

 

 

 

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