In situ characterization of high temperature elastic modulus and fracture toughness in air plasma sprayed thermal barrier coatings under bending by using digital image correlation

2020 ◽  
Vol 46 (11) ◽  
pp. 18526-18533
Author(s):  
W. Zhu ◽  
Q. Wu ◽  
L. Yang ◽  
Y.C. Zhou
Keyword(s):  
Fracture Toughness ◽  
Thermal Barrier Coatings ◽  
Image Correlation ◽  
Thermal Barrier ◽  
Air Plasma ◽  
In Situ Characterization ◽  
Barrier Coatings ◽  
Plasma Sprayed

Characterization of Plasma Sprayed and Electron Beam-Physical Vapor Deposited Thermal Barrier Coatings

1997 ◽  
Author(s):  
Z. Mutasim ◽  
C. Rimlinger ◽  
W. Brentnall
Keyword(s):  
Electron Beam ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
And Performance ◽  
Plasma Sprayed ◽  
Industrial Gas Turbine ◽  
Tbc Systems

Laboratory testing was conducted on air plasma sprayed (APS) and electron beam-physical vapor deposited (EB-PVD) thermal barrier coatings (TBCs) applied onto nickel alloy specimens. As-coated chemistry, microstructure, and bond strength of the TBC systems were evaluated. Cyclic oxidation tests that simulated industrial gas turbine environments were also conducted on the various thermal barrier coatings. This study evaluated the effects of ceramic and metallic coating compositions and application processes on coatings microstructure and performance. The relative cyclic performance of the TBC systems was determined from the laboratory tests.

scholarly journals HARDNESS AND FRATURE TOUGHNE OF PLASMA SPRAYED ZIRCONIA-CERIA-YTTRIA THERMAL BARRIER COATINGS

2018 ◽  
Vol 18 (2) ◽  
pp. 214-228
Author(s):  
Mohammed J Kadhim ◽  
Mohammed H Hafiz ◽  
Maryam A Ali Bash
Keyword(s):  
Fracture Toughness ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Stabilized Zirconia ◽  
Barrier Coatings ◽  
Mean Values ◽  
The Mean ◽  
Plasma Sprayed

Several studies have been made during the recent years to evaluate the plasma sprayedyttria partially stabilized zirconia thermal barrier coatings but less attention wereundertaken on ceria-yttria stabilized zirconia. In this study, zirconia- 20 wt% ceria-3.6wt% yttria thermal barrier coatings were produced by air plasma spraying deposited onIN 738 LC superalloy substrate. The objective of this study is to analysis the distributionof porosity, hardness and fracture toughness on the deposited coatings. Under optimumplasma spraying conditions, it is dangerous to consider the mean values of hardness andfracture toughness. The distributions of hardness and fracture toughness are highlyscattered. The Weibull distribution is the main parameter to describe the plasma sprayedcoatings hardness and fracture toughness.

scholarly journals An image-based model for the sintering of air plasma sprayed thermal barrier coatings

2021 ◽  
Vol 206 ◽  
pp. 116649
Author(s):  
Xun Zhang ◽  
Alan C.F. Cocks ◽  
Yoshifumi Okajima ◽  
Kazuma Takeno ◽  
Taiji Torigoe
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Plasma Sprayed

NONDESTRUCTIVE IMPEDANCE SPECTROSCOPY EVALUATION OF THE BOND COAT OXIDATION IN THERMAL BARRIER COATINGS

2007 ◽  
Vol 14 (05) ◽  
pp. 935-943 ◽  
Author(s):  
L. YANG ◽  
Y. C. ZHOU ◽  
W. G. MAO ◽  
Q. X. LIU
Keyword(s):  
Impedance Spectroscopy ◽  
Thermal Barrier Coatings ◽  
Bond Coat ◽  
Equivalent Circuit Model ◽  
Isothermal Oxidation ◽  
Thermally Grown Oxide ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Plasma Sprayed

In this paper, the impedance spectroscopy technique was employed to examine nondestructively the isothermal oxidation of air plasma sprayed (APS) thermal barrier coatings (TBCs) in air at 800°C. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were also used to characterize the microstructure evolution of TBCs. After oxidation, the thermally grown oxide (TGO), which was mainly composed of alumina as confirmed by EDX, formed at the upper ceramic coat/bond coat interface, the lower bond coat/substrate interface, and the bond coat. Impedance diagrams obtained from impedance measurements at room temperature were analyzed according to the equivalent circuit model proposed for the TBCs. Various observed electrical responses relating to the growth of oxides and the sintering of YSZ were explained by simulating the impedance spectra of the TBCs.

Sign in / Sign up

Export Citation Format

Share Document