Automotive & Mechanical Applications
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Materials and Products for Mechanical Applications Automotive & Mechanical Applications Broad Base. Best Solutions.

SGL Group – The Carbon Company We are SGL Group – The Carbon Company, one of the worldwide leading manufacturers of carbon-based products. We have an in-depth materials, production, applications and engineer­ng expertise, a comprehensive graphite and carbon fiberi based product portfolio, and an integrated value chain from carbon fibers to composites. We operate close to our customers through a global sales network and state-of-the-art production sites in Europe, North America and Asia. With this Broad Base, we offer Best Solutions to our customers with the help of our Company philosophy of...

Graphite Specialties Customized Products for Key Industries The Business Line Graphite Specialties includes the four Business Segments Industrial Applications, Electronic Applications, High-Temperature Applications and Automotive & Mechanical Our comprehensive range of materials extends from isostatically molded, extruded, die-molded and vibration-molded graphite through to carbon and graphite felt and carbon fiber-reinforced carbon. We optimize them to the needs of our customers by drawing on our expertise in the planning, design and processing of complex components made from these...

Carbon, Graphite and RIDURID® Carbon and graphite The production stages for carbon materials are comparable to those for ceramics. Products baked at approx. 1,000 °C are known as hard carbon, hard burned carbon or carbon graphite. The product yielded by thermal treatment above 2,500 °C is called electrographite. H igh-grade raw materials from reliable sources Processing Crushing, milling, sieving, mixing, homogenizing Shaping I sostatic molding, extrusion, die molding Baking C arbonization, redensification Graphitizing Formation of ordered graphite lattice Machining Mechanical processing of...

Specialty Graphite A Material with Exceptional Properties Specialty graphite Specialty graphites are materials whose matrix consists of carbon graphite components. They feature good dry-running properties when used in tribological systems. Their graphite lattice structure comprises carbon atoms arranged in planar hexagonal rings with an interlayer distance of 0.335 nm. Owing to the weakness of the van der Waals attractive forces, these planes can be quite easily displaced relative to one another. The physical parameters of carbon materials are governed by the production processes...

Benefits Provided under Extreme Conditions Mechanical strength Unlike most materials, the mechanical strength values of carbon and graphite increase with rising temperatures and reach their maximum value at approx. 2,500 °C in the case of graphite. The value corresponds to an increase of some 100 % compared to the figure measured at room temperature. Carbon materials should be designed to withstand pressure in order to take advantage of their maximum strength potential. Relative strength 200 Thermal expansion coefficients of various materials Good physical compatibility is achieved by...

Thermal shock resistance of various materials 40 Graphite features the highest thermal shock resistance of all 30 familiar materials. The most significant change in thermal shock resistance can be achieved by changing the material’s thermal 20 conductivity. 10 50 Thermal shock resistance is defined as: 0 40 Strength x thermal conductivity = 30 Coefficient of thermal expansion x E-modulus Thermal shock resistance (in %) Thermal conductivity 400 With 12 W/mK and 100 W/mK, carbon and graphite materials 0 display thermal conductivity values similar to those of metals. This is why 300 they have...

The Cost-Effective Solution for Mechanical Applications Counterface materials Counterface materials for carbon materials can be grouped into metals, oxides and carbides. The technically or economically best solution depends on the choice of suitable counterface materials. These can be combined to produce hard-soft and hard-hard mating surfaces. Carbon is an exceptional material in that it is suitable for both dry and wet running, if selected properly. Commonly employed counterface materials are made from ceramically coated metal, but fully ceramic materials are also being used. The abrasion...

Recommended Uses and Production Processes Recommended uses Carbon is an ideal material for use under special operating conditions, e.g. if • he operating temperatures are outside the permitted range t for lubricating oil or grease; • he product to be sealed should not be contaminated t by lubricant; • he machine elements are in contact with oil solvents or t media that do not provide sufficient lubrication; • he corrosion resistance of other materials is not sufficient. t Production processes Semifinished products Finished products Molding process Machining Small-batch production Complex...

Dynamic Sealing Elements Owing to their tribological behavior, carbon materials are used in dynamic sealing elements under both dry- and mixed-running conditions. A distinction is made between the following designs: • xial seals A such as carbon seal faces, ball valve sealing rings, steam joint rings. • adial seals R such as multi-segment packings to seal shafts on ventilators, ships‘ propellers and water turbines, as well as metal-sleeved carbon rings for compressors. • Motion control rings and segments for controlling automated production processes. Typical applications Carbon seal faces...

Components for Compressors and Vacuum Pumps Graphite’s good dry-running properties ensure maximum performance when combined with various counterface materials. • anes and axial end disks V for dry-running and fresh oil-lubricated rotary vane compressors and vacuum pumps. Suitable counterface materials are: • Gray cast iron • Steel • Sintered steel • Cast aluminum • Ceramics • ther carbon graphite O materials • eal rings and metal-sleeved rings S to seal the shafts of rotary compressors such as rotary screw compressors, root compressors and radial blowers. • iston rings and guide rings P for...