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CVA Technology

Chemical Vapor Aluminizing (CVA) is based on the CVD process and is used for the production of diffusion aluminide coatings for high temperature applications. In the 900 - 1050 °C process, aluminum diffuses into the substrate to produce intermetallic compounds – aluminides.

The CVA process is designed to create homogeneous aluminide diffusion layers with controlled thickness, aluminum content and structure on special high temperature nickel alloys. Both low and high-activity aluminides can be deposited on internal and external areas of components. Besides simple aluminides, the Bernex™ CVA process is capable of delivering precursors for the deposition of complex coatings with the addition of Cr, Si, Co, Hf, Y and other elements.

The aluminides offer remarkable resistance to high temperature oxidation and corrosion. Therefore, they are suitable for blades protection in the hot section of turbines. 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 addition, the Bernex™ CVA guarante

  • Environmentally friendly processes, not generating waste powders
  • Precise control over the deposition process
  • Possibility to coat internal cooling channels
  • Uniform coating thickness over large areas
  • Possibility to produce multi-material coatings
  • Low surface defects density