Fabrication of Nanosized Lanthanum Zirconate Powder and Deposition of Thermal Barrier Coating by Plasma Spray Process

2016 ◽  
Vol 25 (7) ◽  
pp. 2570-2575 ◽  
Author(s):  
S. K. Mishra ◽  
N. Jagdeesh ◽  
L. C. Pathak
Keyword(s):  
Thermal Barrier Coating ◽  
Plasma Spray ◽  
Thermal Barrier ◽  
Lanthanum Zirconate ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Barrier Coating

Nanocomposite Lanthanum Zirconate Thermal Barrier Coating Deposited by Suspension Plasma Spray Process

2014 ◽  
Vol 23 (7) ◽  
pp. 1030-1036 ◽  
Author(s):  
Chaohui Wang ◽  
You Wang ◽  
Liang Wang ◽  
Guangzhao Hao ◽  
Xiaoguang Sun ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Plasma Spray ◽  
Suspension Plasma Spray ◽  
Thermal Barrier ◽  
Lanthanum Zirconate ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Barrier Coating

2CaO･SiO2-CaO･ZrO2 Thermal Barrier Coating Formed by Plasma Spray Process

2006 ◽  
Vol 522-523 ◽  
pp. 239-246 ◽  
Author(s):  
Noriyuki Mifune ◽  
Yoshio Harada
Keyword(s):  
Thermal Shock ◽  
Thermal Barrier Coating ◽  
Plasma Spray ◽  
Ceramic Coatings ◽  
Thermal Barrier ◽  
Combustion Gas ◽  
Bond Coating ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Barrier Coating

The applicability of 2CaO·SiO2-CaO·ZrO2 ceramic coatings as thermal barrier coatings (TBCs) was investigated. Coatings consisting of various ratios of 2CaO·SiO2-CaO·ZrO2 bond-coated with NiCrAlY were prepared using the plasma spray process. The structure of the coatings was characterized by scanning electron microscopy and X-ray diffraction analysis. The resistance of the coatings to thermal shock was evaluated with acoustic emission techniques under a thermal cycle from 1273 K to room temperature, and the hot corrosion resistance of the coatings was investigated with V2O5 and Na2SO4 at 1273 K for 3 h. The 2CaO·SiO2-10~30mass%CaO·ZrO2 coatings had excellent thermal shock resistance, because the coatings contained a vertical micro-crack in a single flattened ceramic particle. These coatings possessed excellent corrosion protection preventing direct contact between the corrosive ashes and a NiCrAlY bond coating. The CaO in the coating reacted with vanadium compounds and inhibited the penetration of corrosive ashes to the bond coating. The developed 2CaO·SiO2-20mass%CaO·ZrO2 thermal barrier coating on stationary vanes was evaluated in an actual gas turbine. The ceramic coating did not separate from the bond coating and reacted with SOx in combustion gas to produce a stable sulfate (CaSO4), which fixed in the coating. The TBC effectively protected the metal substrate of the vanes in practical operating condition for 25,000 h.

The Solution Precursor Plasma Spray Process for Making Durable Thermal Barrier Coatings

2005 ◽  
Author(s):  
Maurice Gell ◽  
Fang Wu ◽  
Eric H. Jordan ◽  
Nitin P. Padture ◽  
Baki M. Cetegen ◽  
...  
Keyword(s):  
Plasma Spray ◽  
Plasma Plume ◽  
Thermal Barrier ◽  
Solution Precursor Plasma Spray ◽  
Spray Process ◽  
Plasma Spray Process ◽  
Barrier Coating ◽  
Solution Precursor ◽  
And Control ◽  
Thick Coatings

The Solution Precursor Plasma Spray (SPPS) process involves the injection of atomized droplets of precursor into the plasma plume, instead of powder that is used in conventional plasma spray. The resultant thermal barrier coating (TBC) microstructure consists of (1) through-coating-thickness cracks, (2) ultra-fine splats, and (3) nanometer and micrometer-sized dispersed pores. These unique SPPS microstructural features provide highly durable TBCs. The SPPS TBCs in 1121°C /1 hour cyclic furnace tests exhibit a significantly improved spallation life compared to APS, DVC, and EB-PVD/Pt-Al TBCs. Extensive process diagnostic and modeling studies have been conducted to provide a foundation for understanding and control of the process. Process/microstructure/property relationships have been defined. Extension of the process for making thick coatings (> 3mm) and low thermal conductivity coatings are described.

Sign in / Sign up

Export Citation Format

Share Document