On the Microstructures of Platinum Aluminide Bond Coatings Produced by Different Aluminizing Methods: Effects on the Performance of Thermal Barrier Coatings on Ni-Based Superalloys

2018 ◽  
Vol 7 (3) ◽  
pp. 363-369 ◽  
Author(s):  
H. M. Tawancy
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Bond Coatings ◽  
Platinum Aluminide

Mechanism of spallation in platinum aluminide/electron beam physical vapor-deposited thermal barrier coatings

1999 ◽  
Vol 30 (2) ◽  
pp. 427-435 ◽  
Author(s):  
Maurice Gell ◽  
Krishnakumar Vaidyanathan ◽  
Brent Barber ◽  
Eric Jordan ◽  
Jiangtian Cheng
Keyword(s):  
Electron Beam ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Platinum Aluminide

scholarly journals The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Bruce A. Pint ◽  
Michael J. Lance ◽  
J. Allen Haynes
Keyword(s):  
Thermal Barrier Coatings ◽  
Gas Turbines ◽  
Average Lifetime ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Bond Coatings ◽  
Bond Coating ◽  
Negative Effect ◽  
Plasma Sprayed

Several factors are being investigated that affect the performance of thermal barrier coatings (TBC) for use in land-based gas turbines where coatings are mainly thermally sprayed. This study examined high velocity oxygen fuel (HVOF), air plasma-sprayed (APS), and vacuum plasma-sprayed (VPS) MCrAlYHfSi bond coatings with APS YSZ top coatings at 900–1100 °C. For superalloy 247 substrates and VPS coatings tested in 1 h cycles at 1100 °C, removing 0.6 wt %Si had no effect on average lifetime in 1 h cycles at 1100 °C, but adding 0.3%Ti had a negative effect. Rod specimens were coated with APS, HVOF, and HVOF with an outer APS layer bond coating and tested in 100 h cycles in air + 10%H2O at 1100 °C. With an HVOF bond coating, initial results indicate that 12.5 mm diameter rod specimens have much shorter 100 h cycle lifetimes than disk specimens. Much longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.

Sign in / Sign up

Export Citation Format

Share Document