CVA coatings
Chemical Vapor Aluminizing
Ionbond™ CVA coating service
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 Ionbond™ CVA process is capable of delivering precursors for the deposition of complex coatings with the addition of chromium (Cr), sillicon (Si), cobalt (Co), hafnium (Hf), yttrium (Y) and other elements.
Ionbond is the one of the best CVA coating companies in the world.
How does CVA coating technology work?
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 aluminides offer remarkable resistance to high temperature oxidation and corrosion. Therefore, they are suitable for blades protection in the hot section of turbines.
The advanced environmental alternative
The Ionbond™ 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 Ionbond™ CVA guarantee:
Environmentally friendly
Environmentally friendly processes, not generating waste powders
Stay in control
Precise control over the deposition process
Coating accessability
Possibility to coat internal cooling channels
Uniformity
Uniform coating thickness over large areas
Multi-material
Possibility to produce multi-material coatings
Reduce defects
Low surface defects density
Frequently asked questions on CVA
CVA coatings reduce long term costs and increase efficiency. Costs are reduced due to longer-lasting components, which results in higher productivity. CVA is an environmentally friendly proces which results in not generating waste powders. CVA coatings furthermore offer remarkable resistance to high temperature oxidation and corrosion.
Prior to coating, substrates (components) need to be free of any foreign matter, oils and grease on the surfaces that are to be coated, but also in all other areas. The cleaning process is an essential element that determines the adhesion and thus influences the performance of the coated part. All parts are cleaned by Ionbond prior to coating, using a designated process. Ionbond encourages customers to discuss the optimum requirements for their substrates in order to ensure top performance.
The CVA processes produce uniform and homogeneous coatings on the outside and the inside of the part, which rests static in the chamber.
Masking is generally easy with PVD, a line-of-sight process, while masking for PACVD is more challenging, and for CVD it is quite difficult. Contact us to discuss masking options for PVD and CVD coatings.
Typical lead times for both PVD and CVD coating services are usually 3 to 5 days. Test parts and sampling may take additional time for fixturing and process design.
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