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Thermal Shock Behavior of Flame‐Sprayed Free‐Standing Coatings Based on Al 2 O 3 with TiO 2 ‐ and ZrO 2 ‐Additions
Author(s) -
Aneziris Christos G.,
Gehre Patrick,
Kratschmer Tim,
Berek Harry
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02535.x
Subject(s) - materials science , thermal shock , aluminium , titanate , composite material , shock wave , temperature gradient , thermal , titanium , zirconium , plateau (mathematics) , laminar flow , shock (circulatory) , metallurgy , ceramic , thermodynamics , medicine , physics , mathematical analysis , mathematics , quantum mechanics
Because of the combination of laminar grain structures with special Al 2 O 3 –TiO 2 –ZrO 2 ‐compositions, free‐standing flame spraying coatings with superior thermal shock properties were produced presenting a slightly increasing strength plateau up to 900 K temperature gradient and a secondary low strength plateau at a temperature gradient up to 1300 K. The in situ formation of zirconium titanate‐ and aluminum titanate‐nuclei in an Al 2 O 3 ‐matrix led to a high population of microcracks as well as high interconnection of smaller microcracks with the main propagating cracks and as a result an excellent thermal shock performance was registered.