Chemical vapour deposition (CVD) is a chemical process by which vaporized precursor materials adhere to the substrate to form a wide array of coatings. Bernex, with over 45 years of experience, is constantly pushing CVD to the limits.

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CVD produces thin film coatings on large variety of substrates such as tungsten carbides, tool steels, high temperature nickel alloys, ceramics and graphite. A heat treatment returns steel tools and components to the required hardness after coating.

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CVD coatings provide excellent: 

  • Wear resistance 
  • Tribological properties 
  • Corrosion and oxidation protection 

Unlike many other types of coatings, CVD can be used to coat the inside surfaces of complex shapes – the chemical vapour diffuses throughout the reactor and the precursor materials find their way to all surface areas. The Bernex chemical vapour infiltration (CVI) systems even take this one step further and can be used to coat the internal surfaces of porous materials such as 3D-printed shapes or fiber-reinforced objects.

With over 45 years of experience, Bernex has the knowledge and skill to meet the highest environmental and safety regulations with its CVD systems, for maximum productivity, reliability and quality.

CVD Technology

45 Years of expertise

The Bernex™ CVD process, developed and improved since the 1970s, uses metal halides such as TiCl4 or AlCl3 as coating precursors. The vaporized precursor materials are dosed into the reactor to produce a film on the substrate. The precursors are continuously fed into the reaction zone and byproducts continuously removed. CVD processes can be carried out under vacuum or at atmospheric pressure.

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The typical process temperatures for Bernex™ CVD coatings are between 900 and 1050 °C for the high temperature CVD and between 720 and 900 °C for the Bernex™ medium temperature CVD process.

CVD coating qualities:

  • Low stress 
  • Exceptional coating adhesion 
  • High load bearing capacity
  • Excellent coating uniformity, independent of part geometry
  • Suitable for coating complex geometries, including inner surfaces
CVA technology

Extreme heat protection

Chemical vapour aluminizing (CVA) is based on CVD and is used for the production of diffusion aluminide coatings. Aluminide coatings offer remarkable resistance to high temperature oxidation and corrosion and are very suitable for blade protection in the hot section of turbines. The coating can be deposited on internal and external areas of components.

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The Bernex™ CVA is an advanced technology that offers an environmentally friendly, better-performing alternative to traditional pack, out-of-pack and slurry technologies. In the CVA process, at 900 to 1150 °C, aluminum diffuses into the substrate. The process is designed to create homogeneous aluminide diffusion layers on special high temperature nickel alloys, with precision control over the coating’s thickness, aluminum content and structure. The Bernex™ CVA process can also be used for complex coatings, by adding performance-enhancing elements such as Cr, Si, Co, Hf and Y.

CVI technology

Coating every fiber

Chemical vapour infiltration (CVI) technology takes CVD to the next level – in addition to being able to coat the internal surface of components, it makes it possible to coat the internal surface of materials. Porous materials such as carbon fiber bundles require coatings to improve their mechanical properties, protect the fibers and tailor the matrix adhesion.

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The CVI innovation was developed from Bernex’s extended knowledge of designing high temperature, very low pressure CVD machines. The infiltration takes place between 1 to 200 mbar and deposition on the surface up to 900 mbar with a process temperature up to 1600 °C. The flexible design allows for coatings to be deposited on large single objects or many small objects. Special holding jigs permit the coating of components on all surfaces.

Would you like to know more?

Please contact Vasileios Papageorgiou
+41 62 287 86 63