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GRAPHITE PRODUCTS

 

Siliconized graphite        

It’s erosion proofed and corrosion-resistant material made from silicon carbide, carbon and silicon. It resists to highly aggressive media, high temperatures and repeated thermal shocks and the other aggressive and extreme conditions.


Widely used in metallurgy, chemical and petrochemical engineering as critical friction assemblies (sealing, rings, step bearings, etc.) at the pumps, reactors, separators and other equipment; for the immersion thermocouples protection fitting, for stopper and tapping fittings of metallurgical furnaces and ladles supplies, etc.
 

Mark

СГ-М

СГ-Т

СГ-П, СГ-П-0,5

Density, g / cm3

2,25 - 2,4

2,5 - 2,7

2,4 - 2,6

Tensile strength, MPа:

tensile

30 - 40

40 - 50

60

compressive

130 - 160

300 - 320

420 - 450

flexural

70 - 90

90 - 110

100 - 120

Impact strength, J / cm3

29,56

29,56

40,8

Compressive Modulus, MPa

0,97*104

9,5*104

12,7*104

Thermal conductivity at 100 ° C, W / (m * C)

140 - 200

100 - 120

120 - 140

Temperature coefficient of linear expansion at 20-1000oS, 1 / ° C

4,6*10-6

4,6*10-6

4,2*10-6

friction coefficient

0,05

0,05

0,04

Content, %:

silicon carbide

27

50

45

free silicon

15

25

20

free carbon

other

other

other

               

Siliconized graphite SG-P resistance in aggressive environments

Reagent

 Concentration%

Temperature, ° C

Duration of test, day

weight loss,%

Hydrochloric acid

34

boiling

60

0,02

Acetic acid

98

boiling

60

0,01

Phosphoric acid

85

boiling

60

0,10

Sulfuric acid

94

288

60

0,50

Nitric acid

70

121

60

0,14

Nitric acid

80

110

60

0,50

Formic acid

100

101

60

0,01

Sodium hydroxide

20

boiling

10

10

Hydrofluoric acid

42

20

30

1.5

Methyl chloride

100

20

60

0.01

acetic anhydride

70

140

200

0.09

Multi-dimensionally reinforced carbon-carbon composite materials (Desna T-1, Desna T-4, KM-BM-4D)

• Represent materials based on a carbon matrix and a 3D or 4D frame from carbon fibers
• They are designed for use in products of high-temperature, atomic and space technology
• Multi-dimensionally reinforced carbon-carbon composite materials due to uniquely high thermal strength and erosion resistance are used in the construction of rocket engines of solid fuel and brake devices of modern aircraft
• 3D and 4D carbon-carbon composite materials are made in the form of cylindrical pieces and parallelepipeds due to commercial processes. It called “Desna” and produced by JSC “NIIGRAFIT”.
 

Density, g / cm3

1.9

Tensile strength, MPa

≥100

Tensile Modulus, GPa

≤60

Compressive strength, MPa

≥130

Compressive Modulus, GPa

≤40

The average coefficient of thermal conductivity in the direction of reinforcing axes, W / m ∙ K

≤74

The average temperature coefficient of linear expansion in the temperature range 20 - 2800 ° C, 10 -6 ∙ K-1

≤3,5