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Ceramic Crucibles



Alumina Ceramic Crucibles


Alumina ceramic crucibles includes: curved crucibles,square crucibles,rectangular crucibles,cylindrical crucible and a variety of irregular shaped crucible. Alumina ceramic crucible is suitable for the analysis and melt of metal or non-metallic samples in a variety of laboratory and industrial applications.


Alumina crucible features:

1. high purity: Al2O3>99%,good chemical resistance

2. temperature resistance, long-term use at 1600℃,1800℃ short-term

3. thermal shock resistance and good resistance to crack

4. slip casting,high density,high purity alumina


99% alumina corundum ceramic crucible specifications: 5ml 10ml 15ml 20ml 25ml 30ml 50ml 100ml 150ml 200ml 250ml


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