Bending deformation and formation of cracks in aluminum alloys with plasma-sprayed ceramics coating

Abstract

The plasma spraying coatings of Al₂O₃, 3%TiO₂-Al₂O₃, 13%TiO₂-Al₂O₃, TiO₂ and partially stabilized ZrO₂ films on aluminum alloys have been carried out. 13%TiO₂-Al₂O₃ coating shows the best results in the tests of various bendings. The formation of main cracks are clearly detected by the comparison of the bending stress-strain curves of specimens coated with ceramics on tension side and those on compression side. The brittleness of the ceramics coatings is evaluated by the bending test of the specimens without undercoatings.