The Bernex ATL Aluvap CVA (Chemical Vapor Aluminizing) coating systems are designed to deposit an aluminide diffusion layer on hot section turbine components such as turbine blades and stators.  

In the past ten years, the inlet temperature for gas turbines has risen from 1100(°)C to 1230(°)C (gas plus cooling air) and the gas itself can be as hot as 1550(°)C. Due to the high operating temperatures and extreme operating conditions, surface treatments for turbine blades (as well as other hot section parts) have been developed to combat wear, fatigue, creep, corrosion and oxidation.  

The equipment is especially suitable for coating internal cooling channels that cannot be treated by pack / out-of-pack or aluminium slurry processes. Indeed, the Bernex ATL Aluvap process is superior than other processes because it offers:  

• Reduced waste disposal headaches inherent in pack and out-of-pack aluminizing processes
• Increased flexibility and control over active reactants, ability to add other elements for enhanced performance
• Cleaning of the coating is not required after the treatment process
• Superior distribution of the aluminum diffusion layer
• Least surface defect density  
  

The Bernex ATL Aluvap systems are modular in order to satisfy specific user demands. The following items are available, and can also be provided as a retrofit:

• Second retort for increased output
• Additional gas line for coating internal channels
• All graphite retort for very high temperature heat treatment
• FIC (Fluoride Ion Cleaning) module using HF or CF4
• Silicon doping source
• Internal generators for high activity process (using AlCl)
• Chromizing module
• Dedicated work trays
• Exhaust neutralization device
• Gas purification devices  

The automated Bernex ATL Aluvap CVA systems are available with different retort sizes. Special dimensions are available upon request.  

The turn-key Bernex  ATL Aluvap CVA systems are delivered with the most advanced process know-how and recipes to allow ready use on high temperature industrial and aero gas turbine components.

• Low activity aluminizing process
• High activity aluminising process
• Heat treatment
• Hf doped layers
• Zr doped layers
• Si doped layers
• Chromising process