Patent ID: 8651083
Filing Date: 2014-02-18
Classification: C23C

Abstract:
1. A thermally sprayed coating forming method comprising: forming an upper thermally sprayed coating portion having a first iron oxide concentration on an upper wall section of an internal wall of a cylinder bore of a cylinder block by thermally spraying droplets of a molten metal on the upper wall section of an internal wall of a cylinder bore of a cylinder block; and forming a lower thermally sprayed coating portion having a second iron oxide concentration on a lower wall section of an internal wall of the cylinder bore of the cylinder block by thermally spraying droplets of a molten metal on the lower wall section of the internal wall of the cylinder bore of the cylinder block; the forming of the upper and lower thermally sprayed coating portions being performed by moving a nozzle used to spray the droplets of the molten metal inside the cylinder bore with a varied feed stroke to make the first and second iron oxide concentrations in the upper and lower thermally sprayed coating portions different from each other.