TY - JOUR
T1 - Influence of long-term aqueous exposure on surface properties of plasma sprayed oxides Al 2 O 3 , TiO 2 and their mixture Al 2 O 3 -13TiO 2
AU - Harju, Mika
AU - Järn, Mikael
AU - Dahlsten, Per
AU - Rosenholm, Jarl B.
AU - Mäntylä, Tapio
PY - 2008
Y1 - 2008
N2 - The surface properties of plasma sprayed Al 2 O 3 - and TiO 2 -based coating materials were characterized in order to investigate the influence of surface strain and phase inhomogenity. The materials were water exposed up to 8 months. The bulk crystallographic structure, dissolution behaviour, effective charge (zeta potential, isoelectric point), surface compositions and oxidation states were determined. In addition, the properties of the aging solutions, such as conductivity, supernatant pH (point of zero charge), and redox potential, were monitored during aging. It was shown that the materials were stable under aging conditions, but that considerable surface rearrangements, such as dissolution-reprecipitation and surface site redistributions may occur. However, overall only minor changes in surface properties results from this restructuring process. © 2008 Elsevier B.V. All rights reserved.
AB - The surface properties of plasma sprayed Al 2 O 3 - and TiO 2 -based coating materials were characterized in order to investigate the influence of surface strain and phase inhomogenity. The materials were water exposed up to 8 months. The bulk crystallographic structure, dissolution behaviour, effective charge (zeta potential, isoelectric point), surface compositions and oxidation states were determined. In addition, the properties of the aging solutions, such as conductivity, supernatant pH (point of zero charge), and redox potential, were monitored during aging. It was shown that the materials were stable under aging conditions, but that considerable surface rearrangements, such as dissolution-reprecipitation and surface site redistributions may occur. However, overall only minor changes in surface properties results from this restructuring process. © 2008 Elsevier B.V. All rights reserved.
KW - Alumina
KW - Dissolution
KW - IEP
KW - Plasma spraying
KW - Surface state
KW - Titania
KW - Zeta potential
UR - https://www.mendeley.com/catalogue/5f484cef-5555-3631-86ec-70b4fe9b6572/
U2 - 10.1016/j.apsusc.2008.05.312
DO - 10.1016/j.apsusc.2008.05.312
M3 - Article
SN - 0169-4332
VL - 254
SP - 7272
EP - 7279
JO - Applied Surface Science
JF - Applied Surface Science
IS - 22
ER -