Abstract
I had already studied that boundary layer was necessary at flame spray coating of ceramics.
The sprayed ceramics film is more closely adhered if the steel surface is first coated with boundary layer and the flame spray is carried out on it.
The change of boundary layer (hardness, state of solid diffusion and adhesive strength of film at various conditions) was investigated when the ceramics coated steel with boundary layer is exposed to high temperature in vacuum.
As a result, it was found that the boundary layer is diffused to steel and excellently bond film and steel, moreover, protect from oxidation of steel through the open pore of film at high temperature.
