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HVOF Coating Applications for Modern Gas Turbine Engines

October 2, 2007 by VAC AERO International

In order to maximize efficiency in modern gas turbine engines, manufacturers have developed methods of obtaining minimal clearance between rotating turbine blade tips and stationary engine casings. One method utilized involves allowing the tips of the turbine blades to wear into a rub tolerant surface on the casing. This ensures that when the blades are fully extended due to centrifugal forces during engine operation, only a minimal leak path will exist for the hot gas across the tips of the blades.

In order to minimize blade tip wear, engine manufacturers are now designing blade tips with wear resistant coatings. VAC AERO has developed an HVOF CoCrAlY coating that fulfills this application.

fig1_blade-tips.gif
Blade tips sprayed with HVOF CoCrAlY.  Metal mask set up is shown.
fig3_micrograph.gif
Micrograph showing HVOF CoCrAlY on blade tip (overspray is also shown).

 

 

 

 

 

 

fig2_blade-tips_2.gif
Blade tips sprayed with HVOF CoCrAlY.
fig4_micrograph_2.gif
Micrograph showing HVOF CoCrAlY on blade tip.

 

 

 

 

 

 

For more information please visit our Coatings division.

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