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Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia

Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia
Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia
Yttria-stabilized zirconia powders, containing different levels of SiO2 and Al2O3, have been plasma sprayed onto metallic substrates. The coatings were detached from their substrates and a dilatometer was used to monitor the dimensional changes they exhibited during prolonged heat treatments. It was found that specimens containing higher levels of silica and alumina exhibited higher rates of linear contraction, in both in-plane and through-thickness directions. The in-plane stiffness and the through-thickness thermal conductivity were also measured after different heat treatments and these were found to increase at a greater rate for specimens with higher impurity (silica and alumina) levels. Changes in the pore architecture during heat treatments were studied using Mercury Intrusion Porosimetry (MIP). Fine scale porosity (<_50 nm) was found to be sharply reduced even by relatively short heat treatments. This is correlated with improvements in inter-splat bonding and partial healing of intra-splat microcracks, which are responsible for the observed changes in stiffness and conductivity, as well as the dimensional changes.
apparent Young?s modulus, plasma spray coatings, porous material, sintering, thermal conductivity
1059-9630
798-803
Paul, S.
83953eee-4704-4a37-a39a-3f885b22af28
Cipitria, A.
53f2ee50-b925-41f3-a195-ecb46fce2c01
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Xie, L.
eb0f012c-02b1-4819-87e9-1ecf04c5a23e
Dorfman, M.R.
7e6d5a68-da64-4dd5-a04f-6ec0a757fe66
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b
Paul, S.
83953eee-4704-4a37-a39a-3f885b22af28
Cipitria, A.
53f2ee50-b925-41f3-a195-ecb46fce2c01
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Xie, L.
eb0f012c-02b1-4819-87e9-1ecf04c5a23e
Dorfman, M.R.
7e6d5a68-da64-4dd5-a04f-6ec0a757fe66
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b

Paul, S., Cipitria, A., Golosnoy, I.O., Xie, L., Dorfman, M.R. and Clyne, T.W. (2007) Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia. Journal of Thermal Spray Technology, 16 (5-6), 798-803. (doi:10.1007/s11666-007-9097-5).

Record type: Article

Abstract

Yttria-stabilized zirconia powders, containing different levels of SiO2 and Al2O3, have been plasma sprayed onto metallic substrates. The coatings were detached from their substrates and a dilatometer was used to monitor the dimensional changes they exhibited during prolonged heat treatments. It was found that specimens containing higher levels of silica and alumina exhibited higher rates of linear contraction, in both in-plane and through-thickness directions. The in-plane stiffness and the through-thickness thermal conductivity were also measured after different heat treatments and these were found to increase at a greater rate for specimens with higher impurity (silica and alumina) levels. Changes in the pore architecture during heat treatments were studied using Mercury Intrusion Porosimetry (MIP). Fine scale porosity (<_50 nm) was found to be sharply reduced even by relatively short heat treatments. This is correlated with improvements in inter-splat bonding and partial healing of intra-splat microcracks, which are responsible for the observed changes in stiffness and conductivity, as well as the dimensional changes.

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Published date: December 2007
Keywords: apparent Young?s modulus, plasma spray coatings, porous material, sintering, thermal conductivity
Organisations: EEE

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Local EPrints ID: 265160
URI: http://eprints.soton.ac.uk/id/eprint/265160
ISSN: 1059-9630
PURE UUID: efb69a39-3cbc-41bf-ae6e-ecd1b7695f92

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Date deposited: 07 Feb 2008 11:43
Last modified: 09 Dec 2019 20:12

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