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Thermal Shock Behavior of Flame-Sprayed Free-Standing Coatings Based on Al2O3 with TiO2- and ZrO2-Additions

2010; Wiley; Volume: 8; Issue: 4 Linguagem: Inglês

10.1111/j.1744-7402.2010.02535.x

1744-7402

Christos G. Aneziris, Patrick Gehre, Tim Kratschmer, Harry Berek,

Advanced materials and composites

Because of the combination of laminar grain structures with special Al2O3–TiO2–ZrO2-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 Al2O3-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.