Investigations on oxidation, hot corrosion and thermal gradient performance of low k-La2Mo2O9 thermal barrier coating

2021 ◽  
Vol 44 (1) ◽  
Author(s):  
N Dharuman ◽  
M Arulmozhi ◽  
Mukiri Soban Babu ◽  
L John Berchmans ◽  
Gosipathala Sreedhar
Keyword(s):  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Thermal Gradient ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Low K

HOT CORROSION OF CERIA-YTTRIA STABILIZED ZIRCONIA PLASMA SPRAYED THERMAL BARRIER COATING BY EUTECTIC VANDIUM PENTAOXIDE-SODIUM SULFATE

2018 ◽  
Vol 18 (1) ◽  
pp. 182-192 ◽  
Author(s):  
Mohammed J Kadhim ◽  
Mohammed H Hafiz ◽  
Maryam A Ali Bash
Keyword(s):  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Monoclinic Phase ◽  
Volume Fraction ◽  
High Volume ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Plan View ◽  
Barrier Coating ◽  
Plasma Sprayed

The high temperature corrosion behavior of thermal barrier coating (TBC) systemconsisting of IN-738 LC superalloy substrate, air plasma sprayed Ni24.5Cr6Al0.4Y (wt%)bond coat and air plasma sprayed ZrO2-20 wt% ceria-3.6 wt% yttria (CYSZ) ceramic coatwere characterized. The upper surfaces of CYSZ covered with 30 mg/cm2 , mixed 45 wt%Na2SO4-55 wt% V2O5 salt were exposed at different temperatures from 800 to 1000 oC andinteraction times from 1 up to 8 h. The upper surface plan view of the coatings wereidentified for topography, roughness, chemical composition, phases and reaction productsusing scanning electron microscopy, energy dispersive spectroscopy, talysurf, and X-raydiffraction. XRD analyses of the plasma sprayed coatings after hot corrosion confirmed thephase transformation of nontransformable tetragonal (t') into monoclinic phase, presence ofYVO4 and CeVO4 products. Analysis of the hot corrosion CYSZ coating confirmed theformation of high volume fraction of YVO4, with low volume fractions of CeOV4 and CeO2.The formation of these compounds were combined with formation of monoclinic phase (m)from transformation of nontransformable tetragonal phase (t').

Hot Corrosion Behavior of a Novel Enamel-Based Thermal Barrier Coating

2010 ◽  
Vol 654-656 ◽  
pp. 1944-1947 ◽  
Author(s):  
Ming Li Shen ◽  
Sheng Long Zhu ◽  
Li Xin ◽  
Fu Hui Wang
Keyword(s):  
Weight Loss ◽  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Oxide Scales ◽  
Scale Spallation ◽  
Corrosion Tests ◽  
Internal Oxidation Zone ◽  
Barrier Coating ◽  
No Weight Loss

A novel thermal barrier coating comprised two layers: sputtered bond coat and enamel-zirconia composite top layer. The hot corrosion tests were carried out at 900 °C for 100 h. The salt used in the tests was 25wt% NaCl + 75wt% Na2SO4. Mass loss and spalltion of oxide scales of uncoated K444 specimens was obvious. For the coated specimens, no oxide scale spallation and no weight loss were observed. The TGO formed on the coated specimens was thin layer of mixture oxides of Al, Ti and Cr, while thick multi-layered oxide scales formed on the uncoated specimens. Besides, deep internal oxidation zone was observed on the uncoated specimens. The coatings after hot corrosion tests contained t-ZrO2 and NaAlSi3O8, while the oxide scales formed on the uncoated K444 were TiO2, Cr2O3, NiCr2O4 and Na2Cr2Ti6O16.

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.

Laser Thermal Gradient Testing and Fracture Mechanics Study of a Thermal Barrier Coating

2019 ◽  
Vol 28 (6) ◽  
pp. 1239-1251 ◽  
Author(s):  
Yingsang Wu ◽  
Pei-feng Hsu ◽  
Yao Wang ◽  
Mary Helen McCay ◽  
D. Edward Croy ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Thermal Barrier Coating ◽  
Thermal Gradient ◽  
Thermal Barrier ◽  
Barrier Coating

Hot-corrosion behavior of a La2Ce2O7/YSZ thermal barrier coating exposed to Na2SO4+V2O5 or V2O5 salt at 900°C

2015 ◽  
Vol 41 (5) ◽  
pp. 6604-6609 ◽  
Author(s):  
Xizhong Wang ◽  
Lei Guo ◽  
Hui Peng ◽  
Lei Zheng ◽  
Hongbo Guo ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Barrier Coating
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