Abstract

Transmission electron microscopy of plasma-sprayed Al 2O 3 coatings shows that the interfaces between lamellae consist of regions of perfect contact and regions in which there are gaps of 0.01–0.1 μm which probably arise from adsorbed or entrapped gas between impinging droplets and previously solidified material. This structure is consistent with a previously suggested model for coating formation and can explain some of the mechanical properties of ceramic coatings.

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