High temperature

Graphite and C/C materials for high-temperature applications

While previously steel and cast grids and racks were used, today charging systems made from carbon fibre composites are the number one choice. The high load capacity, combined with tensile and flectional resistance are the decisive arguments for the use of carbon materials, which come into their own in automated processes.

The low density and the light weight of C/C make handling much easier and also ensures an excellent energy balance compared to steel or cast frames. We produce and supply graphite and C/C components for the following applications: 

GTD a competent partner

We have a long-standing experience in the design, production and processing of graphite and C/C. Tasks set by the customer are solved in the design phase with convincing, innovative ideas and concepts. At GTD, we ensure that all of our solutions are in accordance with the latest technical advances within the market; whilst providing provide robust, practical design to meet the long term needs of the customer. Our aim is to find solutions which are as simple as possible, in order to conserve resources and save costs for the end-user.

Design, development, implementation 

Thanks to our manufacturing methods with modern CNC machines, we are able to produce high-quality products very quickly. We are able to handle small quantities as well as mass production. After the delivery of our products, we attach great value to after sales care and always provide direct contact with our customers. This ensures that we share the customers’ product experience, obtain valued feedback and continuously improve our product performance.

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Heat treatment
Heat treatment

If you have questions on our products, please do not hesitate to contact us.

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Your consultant for heat
treatment applications:

     Martin Barthelmie
     Download VCard

    Marco Balzer
     Download VCard

High-temperature applications for C/C and graphite

Vacuum furnaces: Plates and sections to protect the furnace chamber

GTD offers standard products for lining vacuum furnace chambers. Thanks to the use of C/C plates and sections, the sensitive, outer insulation is better protected against damages and thus, the service life of the furnace chamber is significantly extended.

Our standard products are usually available off-the-shelf. Thanks to a high level of availability, long furnace downtimes can be avoided in the event of damage to the existing insulation; thereby reducing operational costs.

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Produktbild CFC-Plattenvielfalt

Vacuum furnaces: C/C connection elements

C/C threaded bars, C/C nuts and C/C washers are particularly well suited as connecting elements for high temperature applications. Unlike heat-resistant metals, C/C is not susceptible to through hardening. Therefore, connecting element do not become brittle and thus have a considerably longer service life.

In addition to the standard sizes, we also produce customized countersunk screws, hammer head screws and many other  screw types; as well as  most types of threads, including UNC and UNF threads.

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C/C connection elements

Heat treatment

The physical properties of carbon fibre-reinforced carbon make it ideally suited for charging systems during high temperature heat treatment of steel in [vacuum furnaces]. The material boasts a high strength combined with little to no distortion of the charging system following many furnace cycles, and is thus ideal for use within these applications.

Furnace energy savings can be made due to the efficient heating and cooling times of C/C charging systems, when compared to standard steel fixtures. Further cost savings can be achieved thanks to shorter cycle times and considerably higher product loading densities; so that despite of higher initial procurement costs, the TCO (Total Cost of Ownership) is reduced.

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Heat treatment

Benefits of C/C charging systems compared to cast and steel frames

  • Low weight
  • Easy handling
  • No distortion
  • Automatable 
  • Low distortion of parts
  • High heat resistance
  • Slimline design

Thanks to the use of C/C hybrid systems the contact reaction between steel and carbon is prevented.

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Heat treatment

Automated charging systems during steel heat treatment

 

The use of C/C charging systems facilitates automatic charging for mass production as the racks retain their shape and geometry following hundreds of heating cycles. Due to the modular design of our C/C charging grilles, it is possible to find a unique and cost-efficient solution and meet all customer specific requirements.

GTD has long-standing experience in the development and design of charging systems and will find a solution for all applications.

For the most common vacuum furnace sizes, we have developed standardised grilles. A modular system for C/C grilles facilitates fast, flexible, cost-efficient and deformation-free charging systems.

 

 

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Soldering – high temperature soldering

Due to increasing quality requirements, (flux inclusions) flux-less sintering at temperatures of up to 1100° Celsius has become more in demand in recent times. This process requires higher temperatures than conventional soldering with flux.

GTD develops and designs the most effective and cost-efficient solution to suit your individual requirements in the field of high-temperature soldering, i.e. soldering procedures in the automotive industry for components carrying fuel, water or gas, such as fuel injectors or oil/water coolers. Due to their stability at high temperatures, Graphite and C/C support systems can prevent component deformation during soldering, in both continuous inert-gas furnaces as well as vacuum furnaces.

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Soldering
Soldering 2

Sintering – high stability and shape retention

There is an ever increasing demand to maintain component shape and dimensional stability during thermal sintering. To achieve this, component conveyors, charging systems and moulds must remain stable when exposed to high processing temperatures. For years, graphite has proven to be mechanically strong at such temperatures, as well as resistant to oxidation and thermal expansion. C/C is also ideally suited to sintering applications, thanks to its low brittleness and strong rigidity. The high strength-to-weight ratio of C/C helps to minimize material use and provides lightweight carriers with low thermal capacities.

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WAFC

WAFC is a high temperature resistant, non-brittle, all oxide ceramic matrix composite (OCMC) material, ideally suited for high temperature applications in high vacuum, in oxidizing or corrosive environments.

The material is produced by the company WPX Faserkeramik GmbH and originally marketed under the name WHIPOX®.

It is possible to realize not only standardized, semi-finished parts (sheets, grids, tubes) but also customer specific solutions (components, systems).

Soldering base and fixture

Soldering bases show negligible heat dissipation, yet maximum tolerance against point loading and temperature gradients.

Separators for C/C carriers

Grids and mesh structures separate the parts from C/C support structures, thereby preventing them from sticking and local Carbon contamination, and avoiding tedious and faulty coating procedures. They are warp free, thermal shock proof and allow automated rack loading.

Product carriers, charging racks

Heavy duty charging racks are very light weight and hence minimize energy loss. They are 100% oxidation resistant, and show no warping or deformation under load, or thermal shock failure under high pressure gas quenching. Their open grid structures facilitate heat flow and homogeneous temperature distribution.

Hybrid solution

The best combination of WAFC and C/C to secure products for bracing and hot pressing in high temperature atmospheres of vacuum furnaces without having contact reactions.

Refractory linings

Ceiling linings and sandwich structures protect against fibre insulation debris caused by high velocity.

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GTD-HybridSystems®

The GTD-HybridSystem®, which was developed solely by GTD in Germany, offers a ground-breaking combination of different materials, such as metal and ceramic, coupled with carbon fiber-reinforced carbon (C/C). This provides a unique synergy of the positive attributes of each material, offering the perfect solution for use in thermal treatment applications above 1000°C. 

>>> Detailed Information on GTD-HybridSystems®

Sintering

Your consultants for high temperature applications:

Martin Barthelmie
 vCard Download

 

Marco Balzer
 Download VCard

What are the benefits provided by our C/C hybrid grilles for heat treatment of high-speed steel?

  • To prevent direct contact between carbon and work piece
  • Process safety during heat treatment
  • Safe handling of charging systems
  • Avoidance of contact reactions

Benefits of the use of C/C compared to steel frames for oil quenching?

  • Low weight of the "dead" mass
  • Higher productivity 
  • Lower deformation
  • Simple handling
  • Extended service life

How does the use of C/C improve the energy balance compared with steel frames?

  • Faster throughput times, as a result reduced unit costs with heat treatment
  • Less "dead" mass