Land Based Gas Turbines

Industrial Gas Turbine Engines (IGT) - similar, in many ways, to aviation turbojet engines, the IGT is designed for the purpose of generating electrical power. One key difference between the two is that land-based IGT`s are generally much larger than their aviation counterparts so IGT frames, bearings, and blades have heavier construction. Similar to Turbojet engines, several components of an IGT engine are coated with thermal spray coating. The most common methods for IGT Engines are Plasma Spray and Gaseous-Fueled HVOF.

Masking for Plasma Spray and Gaseous Fueled HVOF for IGT Engines - Plasma spray and GF-HVOF coatings have extensive use in the gas turbine repair industry for the application of ceramic or thermal barrier coatings (TBCs). TBCs are often applied to the hot zones (combustion zones) of industrial gas turbine components. Wear coatings and abradable coatings are also applied in targeted areas for turbine work. PTFE Group produces tapes, fabrics, and a compound for the purpose of strategic masking against plasma spray coatings. Strategic masking involves the protection of areas where a coating is not desired while allowing for the targeted area to be fully coated.

Key Considerations:

  • Coating Type - Ceramic coatings (TBCs) require a Plasma Spray Masking Tape. Wear coatings may require a Plasma Spray Masking Tape or a heavier HVOF Masking Tape, depending on the equipment being used.
  • Equipment Type - Different systems may  require different masking strategies. 
  • Efficiency - If the customer is currently applying multiple layers of masking tape, a single application of a stronger masking tape will reduce masking time and save cost.
  • Masking Compound - Can HVMC be used as a mould masking material? HVMC may be best for masking of difficult profiles for GF-HVOF.

Recommended Materials

For masking applications of Industrial Gas Turbine components, we recommend:

  • 170-10s Plasma Spray Masking Tape – best for masking intricate profiles for plasma spray
  • 170-20s Double Layer Plasma Spray Masking Tape – best for masking simple profiles or surfaces
  • HVMC (High Velocity Masking Compound) should be recommended for any style of thermal spray coating as a potential reusable masking option
  • 179 series HVOF masking tapes are best for Gas Fuelled HVOF wear coating applications.