Investigation of hot corrosion behavior of thermal barrier coating (TBC) systems with rare earth contents

2018 ◽  
Vol 11 (11) ◽  
Author(s):  
Yasin Ozgurluk ◽  
Kadir Mert Doleker ◽  
Hayrettin Ahlatci ◽  
Abdullah Cahit Karaoglanli
Keyword(s):  
Rare Earth ◽  
Thermal Barrier Coating ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Tbc Systems

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.

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

Preparation of plasma sprayed nanostructured GdPO4 thermal barrier coating and its hot corrosion behavior in molten salts

2017 ◽  
Vol 43 (10) ◽  
pp. 7797-7803 ◽  
Author(s):  
Mingzhu Li ◽  
Yuxian Cheng ◽  
Lei Guo ◽  
Chenglong Zhang ◽  
Yuchen Zhang ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Molten Salts ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Plasma Sprayed

Thermal cycling and hot corrosion behavior of a novel LaPO4/YSZ double-ceramic-layer thermal barrier coating

2018 ◽  
Vol 44 (8) ◽  
pp. 8818-8826 ◽  
Author(s):  
Chenglong Zhang ◽  
Jingming Fei ◽  
Lei Guo ◽  
Jianxing Yu ◽  
Binbin Zhang ◽  
...  
Keyword(s):  
Thermal Cycling ◽  
Thermal Barrier Coating ◽  
Corrosion Behavior ◽  
Hot Corrosion ◽  
Ceramic Layer ◽  
Thermal Barrier ◽  
Barrier Coating

Environmental Effect of Hot Corrosion on Creep and Fatigue Failure of Thermal Barrier Coating Systems

2006 ◽  
Vol 522-523 ◽  
pp. 353-360
Author(s):  
Satoru Takahashi ◽  
Masayuki Yoshiba ◽  
Wataru Kakuta ◽  
Sayuri Matsuoka ◽  
Yoshio Harada
Keyword(s):  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Nucleation Site ◽  
Major Constituent ◽  
Failure Behavior ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Failure Life ◽  
Corrosive Environments ◽  
Tbc Systems

In order to clarify the failure behavior of plasma sprayed thermal barrier coating (TBC) systems under the complicated modes of thermal-mechanical-chemical loadings, the stress rupture property evaluation and failure analysis were conducted for Y2O3-ZrO2 (YSZ) and CaO-SiO2-ZrO2 (C2S-CZ) TBC systems in air and two kinds of high-temperature corrosive environments. Static creep loading was found to bring about the typical creep failure for TBC systems even in the aggressive environment so called hot corrosion almost in similar manner to the case in air. On the contrary, it was revealed that the dynamic fatigue loading tends to cause a significant failure life reduction of TBC systems both in air and in corrosive environments. For YSZ TBC system, the penetration crack preexisting through the top-coat layer tends to provide a nucleation site for the fatigue crack even in air, and more significantly a short circuit path for the corrosive species in hot corrosive environment. For C2S-CZ system, on the contrary, the top-coat / bond-coat interface tends to provide easily the nucleation site for a main crack to propagate thereafter toward both the alloy interior and outer surface. Under lower stress level at 950°C, however, the oxide-induced crack closure together with crack tip blunting attributed mainly to the high reactivity of Ca compounds as a major constituent of the TC is effective to suppress substantially the crack propagation, so as to cause the prolonged failure life as compared to YSZ system even in aggressive gaseous environment.

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