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Recrystallised Alumina KER710 Tubes

Recrystallised Alumina KER710 Tubes

HIGHLION produce a wide range of thermocouple protection sheaths, recrystallised alumina KER710 (Alsint99.7) tubes have very good thermal shock resistance,higher thermal conductivity and mechanical strengths.


Chemical composition and Physical Properties

PROPERTY

UNIT

ALUMINA CERAMIC

Type to DIN EN 60672-3

C530

C610

C795

C799

Al2O3 content

%

78

62

95

99.7

Specific gravity

g/cm3

2.5

2.7

3.68

3.82

Water absorption

%

8-12

0

0

0

Hardness

Mohs

6

8

9

9

Modulus of elasticity

Gpa

100

280

300

Flexural strength

N/mm2

30

120

280

300

Coefficient of linear expansion

20-100

20-300

20-600

20-1000

×10-6/

3.5-5

3.5-5

4-6

4-7

5-6

5-6

5-7

5-7

5-7

6-7.5

6-8

7-9

5-7

6-8

7-8

7-9

Specific heat (20-100)

J/kgK

800-900

850-1050

850-1050

850-1050

Thermal conductivity

W/mk

1.4-2

4-6

16-28

19-30

Maximum thermal stress

K

350

150

140

150

Dialectric strength

KV/mm

17

15

17

Max. Temp. Use

1500

1500

1550

1650

Chemical  resistivity

satisfactory

Good

Good

Good

Thermal shock resistance

Very good

Medium good

medium

Medium