氧化铝瓷管Alumina tubes

Item

Properties

Units

High purity corundum

Corundum

1

Al₂O₃content

%

99.7

99.3

2

SiO₂content

%

﹤0.1

—

3

Density

g/cm³

3.93

3.9

4

Water absorption

%

0

<0.01

5

Bending strength

MPa

450

350

6

Camber at high temperature

mm

<0.2 at 1700℃

<0.2 at 1600℃

7

Stick at high temperature

Not stuck at 1700℃

Not stuck at 1600℃

8

Thermal expansion coefficient

10^-6／℃

20—1000℃

8.6

8.2

9

Thermal conductivity

W/m.K

25

25

10

Breakdown strength

KV/mm

20

20

11

12

Resistivity

20℃

Ohm?mm

10¹⁴

10¹⁴

1000℃

MΩ

≥0.08

≥0.08

1300℃

MΩ

≥0.02

≥0.02

Thermal shock

No crack in 6

cycles at 1550℃

No crack in 6

cycles at 1550℃

13

Highest application temperature

℃

1900

1800