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Microstructural characterization of porous thermal barrier coatings by IR gas porosimetry and sintering forecasts

Microstructural characterization of porous thermal barrier coatings by IR gas porosimetry and sintering forecasts
Microstructural characterization of porous thermal barrier coatings by IR gas porosimetry and sintering forecasts
It is known that the thermal diffusivity of plasma sprayed coatings is quite sensitive to the operating conditions, namely the composition and pressure of the operating atmosphere. This makes it possible, in principle, to obtain information, in a non-destructive way, on the microstructure of thermal barrier coatings (TBCs) from thermal diffusivity measurements. An experimental assessment of this idea is presented in this paper. The microstructure of as-sprayed and sintered free-standing atmospheric plasma sprayed YPSZ TBC samples have been characterized by a new technique, named infrared (IR) gas porosimetry, as well as by mercury intrusion porosimetry and image analysis. The results from these different techniques have been compared. Furthermore, the microstructure and thermal diffusivity of sintered samples have been compared with the sintering forecasts produced by Cipitria’s sintering code coupled with the Bruggeman model for thermal diffusivity estimation. Sample-to-sample variations have been discussed and uncertainties in experimental techniques have been analysed. Conditions for accurate microstructural estimations have been obtained and suggestions on the reliability of the statistical evaluation are provided
thermal barrier coatings, microstructure, laser flash, thermal conductivity
1359-6454
248-262
Cernuschi, F.
26b34380-7a3b-4038-a6b4-ed403eebfe0f
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Bison, P.
00905c5f-dc71-442d-a13f-48a8cbf91d48
Moscatelli, A.
6b98211d-e473-4634-bb30-3b6817da58a0
Vassen, R.
16ae4528-5bcd-41d5-9131-0c976e678d16
Bossmann, H.-P.
e33a6c02-e3bb-4367-ab57-2a4ea62c1c2a
Capelli, S.
77ae8b3f-d6bf-4e2a-b32d-5590090cf127
Cernuschi, F.
26b34380-7a3b-4038-a6b4-ed403eebfe0f
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Bison, P.
00905c5f-dc71-442d-a13f-48a8cbf91d48
Moscatelli, A.
6b98211d-e473-4634-bb30-3b6817da58a0
Vassen, R.
16ae4528-5bcd-41d5-9131-0c976e678d16
Bossmann, H.-P.
e33a6c02-e3bb-4367-ab57-2a4ea62c1c2a
Capelli, S.
77ae8b3f-d6bf-4e2a-b32d-5590090cf127

Cernuschi, F., Golosnoy, I.O., Bison, P., Moscatelli, A., Vassen, R., Bossmann, H.-P. and Capelli, S. (2013) Microstructural characterization of porous thermal barrier coatings by IR gas porosimetry and sintering forecasts. Acta Materialia, 61 (1), 248-262.

Record type: Article

Abstract

It is known that the thermal diffusivity of plasma sprayed coatings is quite sensitive to the operating conditions, namely the composition and pressure of the operating atmosphere. This makes it possible, in principle, to obtain information, in a non-destructive way, on the microstructure of thermal barrier coatings (TBCs) from thermal diffusivity measurements. An experimental assessment of this idea is presented in this paper. The microstructure of as-sprayed and sintered free-standing atmospheric plasma sprayed YPSZ TBC samples have been characterized by a new technique, named infrared (IR) gas porosimetry, as well as by mercury intrusion porosimetry and image analysis. The results from these different techniques have been compared. Furthermore, the microstructure and thermal diffusivity of sintered samples have been compared with the sintering forecasts produced by Cipitria’s sintering code coupled with the Bruggeman model for thermal diffusivity estimation. Sample-to-sample variations have been discussed and uncertainties in experimental techniques have been analysed. Conditions for accurate microstructural estimations have been obtained and suggestions on the reliability of the statistical evaluation are provided

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e-pub ahead of print date: 24 October 2012
Published date: January 2013
Keywords: thermal barrier coatings, microstructure, laser flash, thermal conductivity
Organisations: EEE

Identifiers

Local EPrints ID: 349286
URI: https://eprints.soton.ac.uk/id/eprint/349286
ISSN: 1359-6454
PURE UUID: 076cf80e-343f-4c37-830f-d5791e5a6580

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Date deposited: 04 Mar 2013 09:35
Last modified: 11 Nov 2017 10:59

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