GSI – Gesellschaft für Schweißtechnik international mbH
SLV – Schweißtechnische Lehr- und Versuchsanstalten
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Thermal spraying

"Thermal spraying" is a coating procedure from the field of surface technology which can be used in order to produce functional coatings made of metal, ceramic and plastic.

Brief description

The consumable (mostly in a powder or wire form) is fed to a gun where it is partially melted and accelerated and is thus thrown on to the prepared substrate (component).

The procedure is characterised by the fact that the component is mostly not melted completely in this respect and can, so to speak, remain "cold".

The selection of spraying consumables is nearly unlimited since all the materials which exhibit a molten phase can be processed as alloys or mixtures.

Moreover, the components may be made of the most diverse materials, e.g. metal, ceramic and plastic right up to fabric materials.

The energy sources which are utilised for thermal spraying mostly result from the combustion of fuel gas and oxygen (e.g. flame spraying) or an electric energy source (e.g. arc and plasma spraying).

Functional utilisation fields

  • Wear protection
  • Corrosion protection
  • Component repair
  • Electrical conductivity
  • Electrical insulation
  • Special friction or sliding properties
  • Special surface structure (wetting behaviour etc.)
  • Thermal barrier coating etc.

Industrial utilisation fields

  • Printing and paper industries
  • Aerospace
  • Automobile and rail vehicle sectors
  • Mechanical engineering and electrotechnology
  • Medical technology etc.

Utilised materials

  • Metals and alloys
  • Carbides in metal matrices
  • Oxide ceramics
  • Plastics etc.

Most common spraying procedures

  • Detonation spraying
  • Flame spraying (with wire or powder)
  • High-velocity oxy-fuel (HVOF) spraying
  • Cold gas spraying
  • Arc spraying
  • Plasma spraying (atmospheric or in a vacuum) 


With regard to all aspects of the subject of thermal spraying, we offer a wide spectrum of services in cooperation with GSI mbH NL SLV Duisburg. Modern technical equipment which enables the following spraying procedures is used in this respect:

  • Flame spraying with powder
  • Flame spraying with wire
  • Plasma spraying
  • High-velocity oxy-fuel (HVOF) spraying

If you need specialist advice, please get in touch with our experts.

Certification according to DIN EN ISO 9001 and/or the GTS guideline

We are an authorised testing body of the Association of Thermal Sprayers (GTS). For approx. 20 years, we have carried out certification procedures for plants on behalf of GTS.

With a GTS certificate, a spraying plant proves to its interested parties (e.g. client's plant) that it has a quality management system and, in addition, its procedures and personnel are regularly checked by a neutral testing body.

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