Schunk Carbon Technology (Schunk Kohlenstofftechnik): carbon brushes, brush holders, shaft grounding and seal rings

Carbon brushes and brush holders, shaft grounding systems, wind turbine parts, seal rings, SiC30 bearings and pump vanes from Schunk Carbon Technology. Material selection and a quotation for your project.

Carbon brushes for electric motors

Schunk Carbon Technology makes brushes in electrographite, metal graphite and resin-bonded graphite for DC and AC motors. They run in cranes, chemical plants, steel and cement works, paper, printing and textile mills. Litz wires are soldered, crimped or welded.

Electrographite and metal graphite
DC and AC motors
Wear signal wire
Cut-off device at wear limit

Generator and slip ring brushes

For hydro, thermal, biomass and wind generators Schunk selects metal graphite or electrographite brushes for the required current density. Vibration damping, on-load brush replacement and wear indication are available. For slip rings there are low-noise grades for signals.

Metal graphite and electrographite
On-load brush replacement
Low electrical noise on slip rings
Over 100 years of experience

Brush holders and brush rockers

Schunk makes leg, tubular and pocket brush holders and brush rockers for electric drives, generators and machine repair. The holder sets the contact pressure of the brush on the commutator or ring, and integrated wear indication simplifies replacement. Dust extraction serves hydropower plants.

Leg and tubular holders
Brush rockers for generators
Integrated wear indication
Brush dust extraction

Shaft grounding systems

High-frequency parasitic currents from drive controllers pass through bearings and gearboxes and melt the raceway surface. The IPS system diverts current from the shaft through a strand of thousands of coated carbon fibers, and generators use two-layer grounding brushes with holders.

IPS carbon fiber system
Two-layer grounding brushes
About 200,000 fibers per strand
For DC and AC drives

Wind turbine parts

For wind turbines Schunk makes brushes for generators and pitch systems, holders with wear indication, flexible current connectors, lightning protection and carbon azimuth brake pads. The pads do not squeak, produce almost no dust and resist a variety of lubricants.

Pitch system brushes
Azimuth brake pads
Lightning protection systems
Onshore and offshore turbines

Seal rings in carbon and SiC

Carbon-graphite rings impregnated with synthetic resin or metal run dry and resist chemicals. Rings in sintered SSiC and silicon-infiltrated SiSiC are made up to 900 mm in diameter. The range adds segmented rings, metal clad rings for gap seals and the PrimeCarb pairing.

Impregnated carbon-graphite
SiC rings up to 900 mm
Segmented seal rings
PrimeCarb material pairing

SiC30 and graphite slide bearings

SiC30 is made by impregnating porous electrographite with molten silicon, so it combines the strength of SiC with the emergency running properties of graphite. It is used for slide bearings and seal faces in pumps and compressors. Furnaces use dry-running graphite bearings.

SiC30: SiC and graphite composite
Tolerant to edge running
Pump and compressor bearings
Dry-running graphite bearings

Pump vanes and crane wheel lubrication

MarathonCarb vanes for dry-running rotary vane vacuum pumps wear slowly and do not swell in humidity. For crane wheels Schunk makes solid lubricant pins for wheel flanges: a spring presses the pin against the flange, with grades for indoor and outdoor use.

MarathonCarb rotary vanes
Up to three times longer life
Wheel flange lubrication pins
Complete set with holder

How to choose a Schunk Carbon Technology component

Selection starts with the unit.

For electric motors, generators and slip rings Schunk Carbon Technology makes carbon brushes, brush holders and brush rockers; for bearing protection, shaft grounding systems; for pumps and compressors, seal rings, slide bearings and vanes; for furnaces, insulation and fasteners.

Brush material is chosen by electrical properties, sliding speed, environment, counterpart material and vibration level. For rings and bearings the medium, temperature and lubrication regime decide.

Carbon brushes and brush holders

Brushes are made in electrographite, metal graphite and resin-bonded graphite for DC and AC motors, generators in hydro, thermal and wind power, and slip rings. Options include a wear signal wire, a cut-off device at the wear limit and a damping element at the brush head.

Brush holders come as leg, tubular and pocket designs; brush rockers are supplied fully or partially assembled. A dust extraction system serves hydropower plants.

Shaft grounding and wind turbine parts

The IPS system diverts parasitic currents from the shaft through a strand of thousands of coated carbon fibers; it suits DC and AC applications and does not depend on shaft diameter. The wind turbine version uses strands of around 200,000 fibers.

For wind turbines Schunk also makes generator and pitch system brushes, two-layer grounding brushes, lightning protection, flexible current connectors and carbon azimuth brake pads.

Seal rings

Rings in carbon-graphite and high-performance graphite are supplied plain or impregnated with synthetic resin or metal and can run dry. Rings in sintered SSiC and silicon-infiltrated SiSiC are made up to 900 mm in diameter.

Segmented rings seal rotating and oscillating movements, and metal clad rings serve gap ring seals. The PrimeCarb pairing resists blister formation in mechanical seals.

Bearings, vanes and lubrication

SiC30 is made by impregnating highly porous electrographite with molten silicon; its main applications are sliding rings and slide bearings in pumps and compressors. Furnace systems use dry-running graphite bearings.

MarathonCarb vanes serve dry-running rotary vane vacuum pumps. Solid lubricant pins for crane wheel flanges come as a complete set with a holder.

Furnace spare parts and graphite electrodes

For vacuum furnaces Schunk makes hard and soft felt insulation, fastening hardware, carbon fiber-reinforced carbon profiles for edge protection, graphite coating powder, fans and heating elements.

Graphite electrodes for EDM are machined from the customer 2D or 3D CAD design and fit quick clamping systems such as Erowa, 3R or Hirschmann.

The manufacturer

Schunk Carbon Technology is the carbon and graphite business of the Schunk Group; its German legal entity is Schunk Kohlenstofftechnik GmbH in Heuchelheim. Ludwig Schunk founded the group in 1913. In China the business operates as Schunk Carbon Technology (Suzhou) Co., Ltd.

The clamping technology company Schunk GmbH & Co. KG is a separate business. Material grade, dimensions and lead time are stated in the quotation for each project.

Schunk Carbon Technology and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Schunk Carbon Technology and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.