OJSC «SvetlogorskKhimvolokno»
Eng

RAYON BASED CARBON FIBERS. MADE IN BELARUS.

HISTORY

     The first company in the world with activity in rayon based carbon fiber business was «Union Carbide», USA, OH, Parma. It was in 1965 on the basis of R.Bacon’s development. The trade mark of the first commercial rayon carbon fiber was "Thornel-25". The same time similar technology appeared in the USSR.
     Our company started to manufacture carbon fibers more than 30 years ago: test-facility where were only several batch type furnaces. In the beginning of 1980s large shop was erected to produce carbon fabrics for defense. Later it was reorganized to an independent company department and it was equipped with the state-of-the-art production line. The technological process has been developed by NPO "Khimvolokno", Moscow.
     Today we have the world largest rayon filament based carbon fiber capacity.
     And in the same time we produce rayon technical yarn– it is a precursor for carbon fibers.

MARKET

     The world market both of a rayon industrial yarn as well as rayon based carbon materials is globally concentrated and submitted only by several manufacturers. Thus, carbon fibers are produced by not more than 5 companies in the USA, Europe, ex-USSR, and India. The rayon industrial yarn is manufactured by 5 companies in the world (Germany, Austria, Czech, India, Belarus).
     Our main feature: we are the sole company with technological chain from cellulose through manufacturing of rayon industrial yarn to carbon fibers. This definitely expands our opportunities while creating the new material types.

PROPERTIES

     «Ural» carbon fibers have several features caused first of all by properties of initial raw material - rayon industrial yarn:
     Enhanced elasticity, Tunable electric resistance in a range from 10-3 up to 107 Ohm·cm, High sorption capacity of the activated fiber. Both graphitized and activated carbon fibers are biocompatible (versus PAN and pitch based ones).

APPLICATION

     Application areas of carbon fibers constantly extend. Perhaps, since the moment when 50 years ago the first carbon fiber lot was produced, there is no any other type of a chemical fiber, which was used in so many kinds of application. Depending on fiber properties there are 7 basic ways to use carbon fiber:

  1. Heat-resistance and low thermal conduction
  2. Mechanical properties (including tribological and antifriction ones)
  3. High sorption capacity
  4. Electrical properties of carbon fiber
  5. Biocompatibility
  6. Chemical resistance
  7. EMI (electro magnetic induction) shielding

GRAPHITIZED RAYON CARBON FIBERS

SPECIFICATION

Carbon content, %

99 – 99,9

Breaking strength of elementary fiber, GPa

0,5 – 1,2

Tensile modulus , GPa – it is  LOW MODULUS CF!

100 max

Specific gravity, g/cm3

1,4 – 1,5

Diameter of  elementary fiber,  micro meter

6 – 10

Resistance in non-oxidizing medium, ºC

3000 max

Resistance in oxidizing medium (in the air), ºC

450 max

Ash content, %

0,1 – 1

Linear density of carbon yarns, tex

70 – 800

The width of fabrics, tapes, carbon felt, cm

2 – 100

Surface density of carbon fabrics, g/m2

100 – 1200

Thickness of textile materials, mm

0,15 – 2

Thickness of carbon felt, mm

3 – 7

FEATURES

Chemical resistance

Mechanical properties remain in concentrated acids or alkalis at high temp

Textile structure

CLOTH of serge, linen, 8HS weave; TAPES of serge structure, KNITTED cloth, carbon FELT, filament YARNS

Trademarks of graphitized fibers

Ural T–R, Ural T–1,  Ural TM–4, Ural  LO, Ural TR 3/2, Ural LT–1, Ural LT–2 , URAL–N, CARBOPON-22.

ACTIVATED RAYON BASED CARBON FIBRES

Diameter of  elementary fiber,  mkm

6 – 10

Specific surface area, m2/g

700 – 2000

Pores volume, cm3/g

0,3 – 0,9

Specific electrical resistance, Оm·cm

0,02 – 2

Thickness of fabrics, tapes, mm

0,15 – 1,4

Thickness of non-woven material, mm

1,5 – 3

Width, cm

2 – 90

Air-tightness, dm3/ m2 sec

70 – 500

Trademarks of activated fibers

Busofit T-1,Buofit-T, Busofit TМ-4. AUT-M. AUT-milled.  Carbopon-Active.   SAUT-1S.

APPLICATION (in brief)

Heat-resistance and low thermal conductivity

Carbon composites for vacuum furnaces. Carbon felt for thermal insulation of high-temperature furnaces. Rigid felt for thermal insulation. Ablative SRM composites. Solar grade Si-ingot industry: crucible susceptors in the form of basket (CZ-process). Backing strips for soldering and welding (no wetting, no smoldering). Heat-shielding.

Mechanical properties

Sliding bearings and friction units. Carbon brakes. Components of liquid and solid rocket motors (SRM) ablative insulators made of RCC. Carbon fiber reinforced PA and PTFE. Fixing devices (bolts) made of RCC for furnaces.

High sorption capacity

Water purification filters; vodka filtration. Galvanic grouts purification (removes organic substances). Air clearance. CBRN, NBC protective suits; filtering material for protective clothes and gas-masks for contact with toxic substances and poisons. Smell absorbers. Wound dressings and surgical wound dressing, especially when pus-infection and areas containing necrosis; EDLC, or super-capacitors application

Electrical properties

Flexible and rigid heaters, including high-temperature heaters for vacuum furnaces. Heating floor. Infra-red heater. Medical electrodes. Heating tape and fabric. Heating cloth and curtains. Contact brushes for electro-motors. Thermo electrical mats for concrete heating (winter construction), frozen ground heating (winter construction). 3D (high surface area) cathode for rare metal electrochemical extraction.
Electrochemical protection of pipelines: anodes.
EDLC, or super-capacitors application

Biological compatibility

Wound dressing. Artificial joints and bone artificial limbs made from carbon/carbon.
GI (stomach) – adsorbents instead of low effective charcoal.

Chemical resistance

Pipelines and vessel protection. Packing and sealing industry: braiding

EMI shielding

Radar-invisible objects. Computer protection (from information leakage).