OJSC «SvetlogorskKhimvolokno»
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CARBON-CARBON COMPOSITES MADE FROM RAYON BASED GRAPHITE FABRIC “URAL”

COMPOSITES PROPERTIES

  • Specific gravity 1.4 g/cm3 (PAN-CF - 1.7 g/cm3 );
  • Stability in inert (oxidizer-free) ambience is 3000 C max;
  • Stability in oxidizer ambience 400-450 C max; short-term – 1500 C;
  • Insensitivity to electromagnetic, nuclear and space radiation;
  • Filament Tensile Strength 1.2 - 1.5 GPa;
  • Average Tensile Modulus 60 GPa;
  • High elasticity;
  • High chemical stability to acids, alkalis, solvents (at normal & high temperatures);
  • Electrical conductivity.

APPLICATION 

Examples are based on present state of knowledge we have. Material’s unique properties allow other problems also to be solved. It is a reason of close cooperation with users and processing companies when needed.

  • Carbon-carbon composites for heat insulation;
  • High temperature insulation. Asbestos replacement. CVD/CVI composites. Vacuum furnace heat insulation. Crystal pullers;
  • Corrosion resistant lining;
  • Sliding bearings for shipbuilding;
  • Rigid electrical heaters;
  • Radiowave absorption materials (EMI shielding)

PROPERTIES OF CARBON-CARBON VERSUS GRAPHITE.

CARBON-CARBON MADE FROM GRAPHITE FABRIC “URAL”

Material type

Graphite 1

Graphite 2

Carbon-carbon
PAN CF *

Carbon-carbon
from «Ural» fabric*

Specific gravity, g / cm3

1.55-1.60

1.8-1.9

1.43-1.49

1.4-1.5

Strength at 20 º C, MPa

compressive

60-100

160-400

50-140

150-400

flexural

30-70

30-70

70-170

100-160

tensile

20-30

25-35

40-140

50-120

Thermal conductivity, W / m K

20 º C

90-130

10-80

n.d.

5-7

500 º C

70-75

10-60

30-32

7-11

1000 º C

50-55

15-60

n.d.

10-15

CTE α , 10-6 / º C

20-1000 ºC

7-8

4-5

1-7

3-4

20-1500 ºC

8-9

4.5-5.5

n.d.

3.5-4.5

Porosity η, %

26

6-8

n.d.

4-7

* Parallel to fiber axis

GRAPHITE FABRIC URAL™ SPECIFICATION

TYPE OF FABRIC       →

TM-4

T-P

T-2

T-8S

T-1

T-0.5

Count of thread ends per 5 cm:

Warp

195

98

98

140

98

110

Weft

120

70

65

100

70

80

Surface density, gms/m2

1100±100

335±30

300±30

290±30

170±20

120±20

Width of the fabric, cm

50±5

50±5

42±4

50±5

55±5

55±5

Thickness, mm

1.7-1.9

0.45-0.65

0.40-0.60

~ 0.33

0.25-0.35

0.14-0.20

Breaking strength, N / 5 cm

Warp

2940

981

900

900

750

500

Weft

686

343

300

300

250

200

Ash content, %

0.5

0.5

0.5

0.5

0.5

0.5

Specific resistance, Ohm, max

0.3

0.5

0.5

0.5

1.0

1.5

Humidity, %, max

1.0

1.0

1.0

1.0

1.0

1.0

TM-4 is 4-layer fabric, layers are bonded by linen weaving repeating.
T-P is twill weave 2x2 fabric.         T-1 - twill weave 2x2.      T-2 - linen weave 1x1. T-8S - 8 harness satin.
TEMPERATURE OF GRAPHITATION: 2200 ºC
Fabric is on paper roll ( 60 mm diameter min ).
Roll  length is 700±30 mm. In every roll  only 1 (one) piece of fabric.
Fabric weight: 5 kg min; 3 kg weight is allowed for 10% of pieces in the lot.
Roll of fabric is wrapped into polyethylene (PE) film and then packed into cardboard box.