CVA coatings

Chemical Vapor Aluminizing

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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 Cr, Si, Co, Hf, Y and other elements.

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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

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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.

The degree to which masking can be performed depends on the process. Masking is generally easy in case of the PVD process, which is a line of sight process, but more difficult for the PACVD and very difficult in the case of CVD.

Typical lead times are 3 to 5 days. Test parts and samplings take more time as fixturing and process design is required.