Equipment Brokerage

The Fluoride Ion Cleaning Process

Gas turbine components and, in particular, the turbine blades and vanes are exposed during operation to high temperatures and cyclic stresses, which often result in the formation of thermal fatigue cracks. So that these cracks can be repaired by means of known vacuum brazing methods, oxide products that formed in these cracks during engine service need to be removed. The Fluoride Ion Cleaning (FIC) method was first developed by Keller and Resor of General Electric in 1977 in order to repair nickel based superalloys that were previously non-repairable. Further refinements in the early 80’s based on Chemical Vapor Deposition  production processing equipment, have made the FIC an essential tool for the repair of Aero and Industrial gas turbine components in turbine component repair centers worldwide.

In the FIC process, the components to be cleaned are exposed in a cleaning chamber, at a temperature of approximately 1000 C, to a gas atmosphere containing gaseous fluorine compounds (often introduced as HF gas)  which dissociate to form fluoride ions and in turn, are suitable for reducing the Chromium, Aluminum and Titanium oxides present in the cracks. The cleaned part has a surface layer free of oxides and is depleted of chromium, aluminum and titanium making it more readily brazable. A typical FIC system is comprised of an electrically heated furnace; a reaction chamber (retort); vacuum system; hydrogen and argon delivery system; gaseous HF delivery system; fume neutralization system (scrubber) -- all controlled by a microprocessor based automated control system.

For Sale

  - Dual Station Gas Fired Bell Furnace for Diffusion Coating

Station Gas Fired Bell Furnace for Diffusion Coating

Gas Fired Coating Furnace Equipment Description (pdf) 

  Fully automatic operation, from furnace and cooling car motion to combustion startup and operation,
  using A/B SLC5/04 PLC
  Furnace max temperature:
F (6 hi velocity burners operating in a single zone)
  Load max temperature: 2120F with +/- 25F uniformity
  Load size: 3000 lbs in 48” dia x 55” tall hot zone
  Furnace Bell moves between 2 Heating ‘Stations’, with cooling ‘bells’ that enclose and blow air around load
  during cooldown
  Argon/nitrogen gas controls for controlling atmosphere inside retort covering each load


Ti-Coating 5040 Fluoride Ion Cleaning Unit

5040 Equipment Description (pdf) 

  Top loading, electrically heated, furnace design
  Three (3) independently controlled, SCR fired, temperature zones
  Light weight ceramic fiber insulation Kanthal™ heating elements
  Atmospheric or sub-atmospheric capable operation
  High volume cooling blowers with distributed flow for rapid cooling
Reaction Chamber (retort, cover, gas distribution components & rack)
  50” Dia. X 40” High work zone Atmospheric or sub-atmospheric capable operation (external bell design)
  RA 330 alloy retort and cover
Water cooled O-Ring seal design
  RA 330 alloy Tooling, Heat shields, and gas distribution components

Hydrogen and Argon Gas Distribution system
  Fully enclosed mass-flow based gas delivery circuits
  All stainless, orbital welded piping construction
  316L SS Electropolished Fittings and Tubing
  Integrated combustible leak detection
Hydrogen Fluoride Distribution System
  Power ventilated enclosure with polycarbonate viewing windows Mass-flow based gas delivery
  and purge circuits
  All stainless, orbital welded piping construction
  316L SS Electropolished Fittings and Tubing
  Integrated HF leak detection with Ammonia neutralization
  Integrated HF cylinder heating and emergency cooling system
  Heated HF delivery components and lines
  Cylinder scales with electronic readout, and  built-in loading ramp
  Glove box design to allow cylinder changeover without potential HF exposure
Fume Neutralization System
  Self contained polypropylene tank and fume scrubber
  Integrated circulation pump, with level control
  Caustic metering pump and Ph probe
Microprocessor Based Control System
  Allen-Bradley PLC-5 based programmable controller
  Pre-wired multi-conductor low voltage cabling
Programming and HMI integration not included
Miscellaneous Spare Parts Included with Sale


For further information please contact:

Material Processing Technology, LLC
1965 Forest Park Road; 
Norton Shores, MI 49441

Office 231-780-1265
Mobile 231-740-4091;


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