scholarly journals Evaluation of Delamination Life of 8mass%Y2O3 ZrO2/CoNiCrAlY Thermal Barrier Coating under Heat Cycles

2003 ◽  
Vol 52 (12) ◽  
pp. 1450-1457 ◽  
Author(s):  
Keijiro NAKASA ◽  
Lin GAO ◽  
Masahiko KATO ◽  
Hidetaka NISHIDA
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Delamination Life

Proposal of Delamination Life Evaluation of Thermal Barrier Coating

2000 ◽  
Vol 2000 (0) ◽  
pp. 353-354
Author(s):  
Masayuki ARAI ◽  
Toshio SAKUMA ◽  
Uichi IWATA ◽  
Masahiro SAITOH
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Life Evaluation ◽  
Barrier Coating ◽  
Delamination Life

Evaluation on the Delamination Life of Isothermally Aged Plasma Sprayed Thermal Barrier Coating

2009 ◽  
Vol 33 (2) ◽  
pp. 162-168 ◽  
Author(s):  
Dae-Jin Kim ◽  
In-Hwan Shin ◽  
Jae-Mean Koo ◽  
Chang-Sung Seok ◽  
Moon-Young Kim
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Delamination Life ◽  
Plasma Sprayed

Interface Oxidation Process of ZrO2-8%Y2O3 / CoNiCrAlY Thermal Barrier Coating System

2007 ◽  
Vol 345-346 ◽  
pp. 1035-1038 ◽  
Author(s):  
Hiroyuki Waki ◽  
Akira Kobayashi
Keyword(s):  
Thermal Barrier Coating ◽  
Growth Process ◽  
Thermal Barrier ◽  
Temperature Oxidation ◽  
Electron Probe Micro Analyzer ◽  
Barrier Coating ◽  
Delamination Life ◽  
Tbc Systems ◽  
Tgo Growth ◽  
Y2o3 Layer

Thermal barrier coating (TBC) of a gas turbine blade suffers from high temperature oxidation. It is known that thermally growth oxidation (TGO) grows at the interface between ZrO2- 8%Y2O3 and CoNiCrAlY, and the TGO degrades the adhesive strength. The purpose of this study is to clarify the TGO growth process. Thermal aging tests of ZrO2-8%Y2O3 / CoNiCrAlY TBC systems under various temperature conditions were carried out. TGO growth process was observed by an electron probe micro analyzer (EPMA). Both TGO of Al and TGO of other elements were examined, and the thickness of the TGOs were examined. Results are summarized as follows. (1) The delamination occurred at a ZrO2-8%Y2O3 layer beside the interface. (2) The growth rate of complicated TGO which consisted of Co, Ni and Cr increased with an increase of temperature. However, the complicated TGO wasn’t related with the delamination life. (3) The delamination could occur if the thickness of Al TGO increased more than about 3 μm.

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').

Evaluation of Spatial Resolution of Nondestructive Testing of Thermal Barrier Coating by Terahertz Imaging

2012 ◽  
Vol 132 (10) ◽  
pp. 864-870
Author(s):  
Tetsuo Fukuchi ◽  
Norikazu Fuse ◽  
Mitsutoshi Okada ◽  
Tomoharu Fujii ◽  
Maya Mizuno ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Thermal Barrier Coating ◽  
Spatial Resolution ◽  
Terahertz Imaging ◽  
Thermal Barrier ◽  
Barrier Coating

Surface Roughness Measurement of Thermal Barrier Coating using Terahertz Waves

2017 ◽  
Vol 137 (3) ◽  
pp. 147-152 ◽  
Author(s):  
Tetsuo Fukuchi ◽  
Norikazu Fuse ◽  
Mitsutoshi Okada ◽  
Tomoharu Fujii ◽  
Maya Mizuno ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Roughness Measurement ◽  
Terahertz Waves ◽  
Surface Roughness Measurement ◽  
Barrier Coating
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