scholarly journals Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 101
Author(s):  
Kaijin Huang ◽  
Wei Li ◽  
Kai Pan ◽  
Xin Lin ◽  
Aihua Wang
Keyword(s):  
Corrosion Resistance ◽  
Thermal Barrier Coating ◽  
Laser Cladding ◽  
Inconel 718 ◽  
Electrochemical Techniques ◽  
Thermal Barrier ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Barrier Coating ◽  
Inconel 718 Superalloy

In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

HOT-CORROSION BEHAVIOR OF THERMAL BARRIER COATED DZ125 SUPERALLOY EXPOSED TO ATOMIZED SEAWATER AND KEROSENE

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3155-3160
Author(s):  
ZHIMING BAI ◽  
LE ZHOU ◽  
TIANQUAN LIANG ◽  
HONGBO GUO ◽  
SHENGKAI GONG
Keyword(s):  
Corrosion Resistance ◽  
Electron Beam ◽  
Thermal Barrier Coating ◽  
Corrosion Behavior ◽  
Bond Coat ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Average Mass ◽  
Barrier Coating ◽  
Corrosion Behaviors

The bare superalloy DZ 125 alloy, the aluminide coated specimens and electron beam physical vapor deposited (EB-PVD) thermal barrier coating (TBC) consisting of yttria stabilizied zirconia (YSZ) topcoat and NiCoCrAlY bond coat specimens were exposed to atomized seawater and kerosene at 900°C and the cyclic hot-corrosion behaviors of the specimens were investigated. Disastrous spallation of the bare superalloy occurred within 50 h hot-corrosion. In contrast to this, after 100 h hot-corrosion, the average mass change for the aluminized and TBC coated specimens is 0.7 mg/cm2 and 0.63 mg/cm2, respectively, exhibiting excellent hot-corrosion resistance.

scholarly journals Laser Cladding of Embedded Sensors for Thermal Barrier Coating Applications

Coatings ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 176 ◽  
Author(s):  
Yanli Zhang ◽  
Daniel Mack ◽  
Georg Mauer ◽  
Robert Vaßen
Keyword(s):  
Thermal Barrier Coating ◽  
Laser Cladding ◽  
Embedded Sensors ◽  
Thermal Barrier ◽  
Barrier Coating

scholarly journals Development of Thermal Barrier Coating with Hot Corrosion Resistance.

1992 ◽  
Vol 31 (4) ◽  
pp. 336-338 ◽  
Author(s):  
Shinichi Tamura ◽  
Hatsuo Taira ◽  
Shouji Mishima ◽  
Norifumi Nagata ◽  
Noriyuki Mifune
Keyword(s):  
Corrosion Resistance ◽  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Barrier Coating

Oxidation and hot corrosion resistance of HVOF/EB-PVD thermal barrier coating system

2021 ◽  
Vol 409 ◽  
pp. 126862
Author(s):  
Kadir Mert Doleker ◽  
Yasin Ozgurluk ◽  
Yasar Kahraman ◽  
Abdullah Cahit Karaoglanli
Keyword(s):  
Corrosion Resistance ◽  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Coating System ◽  
Thermal Barrier Coating System ◽  
Barrier Coating

scholarly journals Effects of surface roughness on CMAS corrosion behavior for thermal barrier coating applications

2021 ◽  
Vol 10 (3) ◽  
pp. 472-481
Author(s):  
Lei Guo ◽  
Guang Li ◽  
Zhilin Gan
Keyword(s):  
Surface Roughness ◽  
Corrosion Resistance ◽  
Thermal Barrier Coating ◽  
Capillary Force ◽  
Thermal Barrier ◽  
Stabilized Zirconia ◽  
Spreading Area ◽  
Barrier Coating ◽  
Calcium Magnesium ◽  
Yttria Partially Stabilized Zirconia

AbstractCalcium-magnesium-alumina-silicate (CMAS) corrosion is an important cause for thermal barrier coating (TBC) failure, which has attracted increased attentions. In this study, some thermal barrier coating (TBC) materials including YSZ (yttria partially stabilized zirconia), GdPO4, and LaPO4 were prepared into bulks, and the effects of their surface roughness on wettability and spreading characteristics of molten CMAS were investigated. As-fabricated and polished bulks with different surface roughness were exposed to CMAS corrosion at 1250 °C for 1 and 4 h, following by macro and micro observations. Results revealed that compared with the as-fabricated bulks, molten CMAS on the polished samples had lower wettability and a smaller spreading area, mainly attributable to the reduced capillary force to drive the melt spreading. Meanwhile, GdPO4 and LaPO4 bulks exhibited lower CMAS wettability than YSZ bulk. It is thus considered that reducing the surface roughness is beneficial to CMAS corrosion resistance of TBCs.

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