Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique

Thermal barrier coatings (TBCs) on high temperature components in gas turbine engines are in some cases damaged by calcium-magnesium-alumino-silicates (CMAS) resulting from the ingestion of siliceous minerals at high temperatures exceeding 1200°C. An attempt to develop a non-destructive detection te...

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Autores principales:	Yuki HAYASHI, Satoshi YAMAGISHI, Masakazu OKAZAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	thermal barrier coatings calcium-magnesium-alumino-silicates (cmas) infiltration non-destructive detection electric capacitance delamination Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/f073065c599c413b8bbee4c7a4c14297
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spelling	oai:doaj.org-article:f073065c599c413b8bbee4c7a4c142972021-11-26T06:58:32ZNon-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique2187-974510.1299/mej.16-00280https://doaj.org/article/f073065c599c413b8bbee4c7a4c142972016-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/6/3_16-00280/_pdf/-char/enhttps://doaj.org/toc/2187-9745Thermal barrier coatings (TBCs) on high temperature components in gas turbine engines are in some cases damaged by calcium-magnesium-alumino-silicates (CMAS) resulting from the ingestion of siliceous minerals at high temperatures exceeding 1200°C. An attempt to develop a non-destructive detection technique of CMAS damage on TBCs was carried out through an AC impedance technique in this work. The CMAS-affected TBC specimens were prepared by simulating the CMAS damage in laboratory, employing a synthetic CMAS product. The change in electric capacitance was measured by using an LCR meter. It was found that the capacitance of the ceramic top coat showed higher value at CMAS infiltrated areas, compared with that at the non-infiltrated ones. While the capacitance increased with increasing infiltration depth, the change in capacitance of the TBC specimen decreased when the CMAS enhanced the delamination damage of TBC top coat. Some discussion was made on the changes in capacitance using a simple condenser model, so that the present electric technique is applied to the CMAS damage detection and evaluation.Yuki HAYASHISatoshi YAMAGISHIMasakazu OKAZAKIThe Japan Society of Mechanical Engineersarticlethermal barrier coatingscalcium-magnesium-alumino-silicates (cmas)infiltrationnon-destructive detectionelectric capacitancedelaminationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 6, Pp 16-00280-16-00280 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	thermal barrier coatings calcium-magnesium-alumino-silicates (cmas) infiltration non-destructive detection electric capacitance delamination Mechanical engineering and machinery TJ1-1570
spellingShingle	thermal barrier coatings calcium-magnesium-alumino-silicates (cmas) infiltration non-destructive detection electric capacitance delamination Mechanical engineering and machinery TJ1-1570 Yuki HAYASHI Satoshi YAMAGISHI Masakazu OKAZAKI Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique
description	Thermal barrier coatings (TBCs) on high temperature components in gas turbine engines are in some cases damaged by calcium-magnesium-alumino-silicates (CMAS) resulting from the ingestion of siliceous minerals at high temperatures exceeding 1200°C. An attempt to develop a non-destructive detection technique of CMAS damage on TBCs was carried out through an AC impedance technique in this work. The CMAS-affected TBC specimens were prepared by simulating the CMAS damage in laboratory, employing a synthetic CMAS product. The change in electric capacitance was measured by using an LCR meter. It was found that the capacitance of the ceramic top coat showed higher value at CMAS infiltrated areas, compared with that at the non-infiltrated ones. While the capacitance increased with increasing infiltration depth, the change in capacitance of the TBC specimen decreased when the CMAS enhanced the delamination damage of TBC top coat. Some discussion was made on the changes in capacitance using a simple condenser model, so that the present electric technique is applied to the CMAS damage detection and evaluation.
format	article
author	Yuki HAYASHI Satoshi YAMAGISHI Masakazu OKAZAKI
author_facet	Yuki HAYASHI Satoshi YAMAGISHI Masakazu OKAZAKI
author_sort	Yuki HAYASHI
title	Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique
title_short	Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique
title_full	Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique
title_fullStr	Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique
title_full_unstemmed	Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique
title_sort	non-destructive detection of cmas damage on thermal barrier coatings using ac impedance technique
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/f073065c599c413b8bbee4c7a4c14297
work_keys_str_mv	AT yukihayashi nondestructivedetectionofcmasdamageonthermalbarriercoatingsusingacimpedancetechnique AT satoshiyamagishi nondestructivedetectionofcmasdamageonthermalbarriercoatingsusingacimpedancetechnique AT masakazuokazaki nondestructivedetectionofcmasdamageonthermalbarriercoatingsusingacimpedancetechnique
_version_	1718409754336821248

Non-destructive detection of CMAS damage on thermal barrier coatings using AC impedance technique

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