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A steady-state Bi-substrate technique for measurement of the thermal conductivity of ceramic coatings

A steady-state Bi-substrate technique for measurement of the thermal conductivity of ceramic coatings
A steady-state Bi-substrate technique for measurement of the thermal conductivity of ceramic coatings
This paper presents a steady-state, bi-substrate technique for measurement of the through-thickness thermal conductivity of ceramic coatings, with a range of specimen thickness and porosity content. The technique is based on establishing unidirectional steady-state heat flow through the sample, sandwiched between a pair of (metallic) substrates with known thermal properties. Comparison between the heat fluxes passing through the two substrates allows a check to be made about the accuracy of the assumption of unidirectional heat flow. The interfacial conductances must be known and these can be estimated by testing samples of different thickness. Measured conductivities are likely to be more accurate if the interfacial conductance is relatively high. This is assisted by the introduction of a thin interfacial layer of a viscous, thermally conductive compound, or thermal pads of some sort, and by maintaining a suitable pressure across the setup. However, if such compounds (pastes) are used, then care must be taken to ensure that it does not enter the specimen via surface-connected pores, since this could significantly affect the measured conductivity. The reliability of the technique has been confirmed by testing fused silica samples of known thermal conductivity. It has also been applied to sprayed zirconia and plasma electrolytic oxide (PEO) alumina coatings. The values obtained were 1.05±0.10 W m?1 K?1 and 1.63±0.35 W m?1 K?1, respectively.
Thermal conductivity, Interfacial thermal conductance, Ceramic coating, Plasma sprayed zirconia, Thermal barrier coating, Plasma electrolytic oxide coating
0257-8972
1414-1420
Tan, J.C.
64748a9f-f771-44c3-ac63-fd554193c592
Tsipas, S.A.
cea7cd1e-9b61-4784-8231-5063b53de887
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Curran, J.A.
7d6d92c4-9bd2-4980-8ca8-d1053837ad92
Paul, S.
83953eee-4704-4a37-a39a-3f885b22af28
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b
Tan, J.C.
64748a9f-f771-44c3-ac63-fd554193c592
Tsipas, S.A.
cea7cd1e-9b61-4784-8231-5063b53de887
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Curran, J.A.
7d6d92c4-9bd2-4980-8ca8-d1053837ad92
Paul, S.
83953eee-4704-4a37-a39a-3f885b22af28
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b

Tan, J.C., Tsipas, S.A., Golosnoy, I.O., Curran, J.A., Paul, S. and Clyne, T.W. (2006) A steady-state Bi-substrate technique for measurement of the thermal conductivity of ceramic coatings. Surface and Coatings Technology, 201 (3-4), 1414-1420.

Record type: Article

Abstract

This paper presents a steady-state, bi-substrate technique for measurement of the through-thickness thermal conductivity of ceramic coatings, with a range of specimen thickness and porosity content. The technique is based on establishing unidirectional steady-state heat flow through the sample, sandwiched between a pair of (metallic) substrates with known thermal properties. Comparison between the heat fluxes passing through the two substrates allows a check to be made about the accuracy of the assumption of unidirectional heat flow. The interfacial conductances must be known and these can be estimated by testing samples of different thickness. Measured conductivities are likely to be more accurate if the interfacial conductance is relatively high. This is assisted by the introduction of a thin interfacial layer of a viscous, thermally conductive compound, or thermal pads of some sort, and by maintaining a suitable pressure across the setup. However, if such compounds (pastes) are used, then care must be taken to ensure that it does not enter the specimen via surface-connected pores, since this could significantly affect the measured conductivity. The reliability of the technique has been confirmed by testing fused silica samples of known thermal conductivity. It has also been applied to sprayed zirconia and plasma electrolytic oxide (PEO) alumina coatings. The values obtained were 1.05±0.10 W m?1 K?1 and 1.63±0.35 W m?1 K?1, respectively.

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More information

Published date: October 2006
Keywords: Thermal conductivity, Interfacial thermal conductance, Ceramic coating, Plasma sprayed zirconia, Thermal barrier coating, Plasma electrolytic oxide coating
Organisations: EEE

Identifiers

Local EPrints ID: 264613
URI: http://eprints.soton.ac.uk/id/eprint/264613
ISSN: 0257-8972
PURE UUID: c8404d93-7bc2-4c8f-b1a5-149f908d177c

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Date deposited: 02 Oct 2007
Last modified: 02 Dec 2019 21:04

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