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Ceramisis Ltd
29, Harley Street,
London,
W1G 9QR,
England
Tel:44(0)20 7927 6710
Fax:44(0)20 7637 0419
sales@ceramisis.com
 

 

 

                                 

In vacuum substrate heating Vacuum & high temperature materials Vacuum furnace insulation


>High Density Carbon & Graphite Materials Specifications

High density graphite is a very versatile material, and is used in a wide range of applications. Ceramisis offers a complete range of high density graphites to suit every application where graphite materials are required. Our state of the art CNC manufacturing facility can machine graphite components to the highest tolerances. We can cater for both small quantity and high volume orders.

The main properties of graphite are:

        Ability to withstand very high temperatures up to 2800 C (inert atmosphere or in vacuum)

        Good thermal shock resistance

        Self lubricating

        High compressive strength

        Good chemical resistance

        Dimensionally stable

        Low expansion coefficient

        Strength increases with temperature

        Low friction coefficient

        Electrically conductive

        Will start to oxidise in air at 450 C

The materials properties can be further enhanced by applying impregnations, or coatings. The following impregnations and coatings are available:

        Phosphate impregnation for increased oxidation and wear resistance

        Boron inclusion for increased oxidation and wear resistance

        Metal impregnation for increased strength and reduced porosity

        Resin impregnation for reduced porosity at low temperatures

        Pitch densification for reduced porosity at high temperatures

        Vitreous impregnation to eliminate particles

        Vitreous coating for reduced porosity, eliminate particles and give a highly polished finish
        Pyrolytic Graphite coating for zero porosity and particles, electrically conductive.
        Boron Nitride coating for zero porosity and particles, increased oxidation resistance to 900C in air, electrical insulator.
        Silicon Carbide coating for zero porosity and particles, increased oxidation resistance to 1500C in air, increased chemical resistance, very hard coating, electrical insulator. 

General purpose graphite

Main Characteristic

General purpose low spec

General purpose low spec

General purpose mid spec

General purpose high spec

General purpose high spec

Grade

GP10

GP15

GP20

GP25

GP30

Average grain size- microns

15

15

12

5

8

Density -  g/cc

1.78

1.78

1.79

1.83

1.86

Porosity-   %

10%

11%

11%

10%

8%

Thermal Conductivity-W/mK

85

115

92

69

68

CTE-microns/m.degC

4.6

4.5

5.5

5.7

5.9

Flexural Strength- Mpa

43

40

52

75

65

Compressive Strength- Mpa

93

80

106

170

155

Youngs Modulus - Gpa

9.2

9.9

10

13

12

Shore Hardness

53

52

62

79

76

Resistivity- uOhm cm

1600

1100

1340

1540

1640

Max operating temp- in air

500 deg C

500 deg C

500 deg C

500 deg C

500 deg C

-in vacuum

2200 degC

2200 degC

2200 degC

2200 degC

2200 degC

-in innert gas

2000 degC

2000 degC

2000 degC

2000 degC

2000 degC

 

Specialist Graphite Grades

Main Characteristic

Densified

High thermal conductivity

High electrical reststivity

High strength & expansion

High strength & expansion densified

Ultra fine grained high expansion

Grade

SPG35

SPG40

SPG45

SPG50

SPG55

SPG60

Average grain size- microns

13

10

5

4

4

<1

Density -  g/cc

1.88

1.82

1.65

1.77

1.77

1.79

Porosity-   %

4%

10%

25%

20%

4%

20%

Thermal Conductivity-W/mK

111

140

75

95

95

72

CTE-microns/m.degC

5

4.8

7.7

8.1

8.1

8.1

Flexural Strength- Mpa

57

54

53

85

85

110

Compressive Strength- Mpa

126

90

105

140

140

195

Youngs Modulus - Gpa

12.6

11

9

11

11

14.5

Shore Hardness

65

55

68

74

74

85

Resistivity- uOhm cm

1170

900

1900

1500

1500

1750

Max operating temp- in air

500 deg C

500 deg C

500 deg C

500 deg C

500 deg C

500 deg C

-in vacuum

2200 degC

2200 degC

2200 degC

2200 degC

2200 degC

2200 degC

-in innert gas

2000 degC

2000 degC

2000 degC

2000 degC

2000 degC

2000 degC

 

Oxidation Resistant Graphite Grades

Main Characteristic Oxidation resistant plus:

Boronised wear resistant

Phosphated high strength

Phosphated high thermal conductivity

Phosphated General purpose mid spec

Phosphated General purpose high spec

Grade

HTBG210

HTG300

HTG350

HTG400

HTG450

Average grain size- microns

10

5

10

13

5

Density -  g/cc

1.85

1.87

1.82

1.85

1.86

Porosity-   %

10%

21%

10%

11%

10%

Thermal Conductivity-W/mK

30

60

140

85

70

CTE-microns/m.degC

4.6

7.8

4.8

5.2

5.5

Flexural Strength- Mpa

70

96

54

50

84

Compressive Strength- Mpa

120

185

90

130

208

Youngs Modulus - Gpa

20

11

11

14

13

Shore Hardness

60

94

55

65

85

Resistivity- uOhm cm

1300

2000

900

1200

1550

Max operating temp- in air

800 deg C

600 deg C

600 deg C

600 deg C

600 deg C

Max continuous operating temp in air

600 deg C

550 deg C

550 deg C

550 deg C

550 deg C

 

 

 

 

Tel: +44 (0)20 7927 6710 Fax: +44 (0)20 7637 0419 sales@ceramisis.com Ceramisis Ltd, 29, Harley Street, London, W1G 9QR