Characteristics of Low Pressure Plasma Sprayed Alumina Coating

2009 ◽  
Vol 24 (1) ◽  
pp. 117-121 ◽  
Author(s):  
Chun-Ming DENG ◽  
Ke-Song ZHOU ◽  
Min LIU ◽  
Chang-Guang DENG ◽  
Jin-Bing SONG ◽  
...  
Keyword(s):  
Low Pressure ◽  
Alumina Coating ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed

Wear behavior of low-pressure plasma-sprayed AlCuFe quasicrystalline coating on titanium alloy

Vacuum ◽  
2006 ◽  
Vol 81 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Fei Cai ◽  
Chungen Zhou ◽  
Na Wang ◽  
Shengkai Gong ◽  
Huibin Xu
Keyword(s):  
Titanium Alloy ◽  
Wear Behavior ◽  
Low Pressure ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed

Low-Pressure Plasma-Spray Coatings for Hot-Corrosion Resistance

1981 ◽  
Vol 103 (1) ◽  
pp. 146-153 ◽  
Author(s):  
R. W. Smith ◽  
W. F. Schilling ◽  
H. M. Fox
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Hot Corrosion ◽  
Low Pressure ◽  
Attractive Alternative ◽  
Test Results ◽  
Al2o3 Scale ◽  
Pressure Plasma ◽  
Low Pressure Plasma ◽  
Plasma Sprayed

The hot corrosion of low-pressure plasma-sprayed coating, GT-29 (Co-29Cr-6Al-1Y) on a γ′-strengthened nickel base superalloy, IN-738, was characterized at both 871 °C and 983 °C in a simulated gas turbine environment. The test results show that at 871 °C the dense, defect-free, low-pressure, plasma-sprayed GT-29 coatings provide good corrosion protection up to 8000 hr. The mechanism of protection was the formation of a dense, adherent Al2O3 scale underneath a mixed oxide scale; scale was maintained by a uniformly dispersed Al rich β(CoAl) reservoir. At 982 °C, the coating corrosion protection exceeded 5000 hours and also utilized a protective Al2O3 scale. Due to the higher test temperature, interdiffusion of O, S, Al, Co, and Cr was higher and internal sulfidation/oxidation of the coating occurred; however, the rates were much lower than uncoated IN-738. Field tests were run (13051 and 19842 hr) to evaluate the low-pressure, plasma-sprayed GT-29 coatings’ corrosion resistance on turbine buckets. Metallographic inspection of the field-tested coatings verified the simulated burner-rig test results and demonstrated that the low-pressure plasma process provides an attractive alternative to other coating processes for producing hot-corrosion resistant coatings.

Sign in / Sign up

Export Citation Format

Share Document