CYLINDER BLOCK AND THERMALLY SPRAYED COATING FORMING METHOD

摘要

A cylinder block (1) is provided with a cylinder bore (2) and a thermally sprayed metallic coating disposed on an internal wall (2a) of the cylinder bore (2). The internal wall (2a) has first and second wall sections that are located at different axial locations along the internal wall of the cylinder bore (2). The thermally sprayed metallic coating (3) is disposed on the internal wall (2a) of the cylinder bore (2) by spraying droplets of a molten metal. The thermally sprayed metallic coating (3) includes a first thermally sprayed coating portion (3A) having a first iron oxide concentration and a second thermally sprayed coating portion (3B) having a second iron oxide concentration. The first thermally sprayed coating portion (3A) is disposed on the first wall section. The second thermally sprayed coating portion (3B) is disposed on the second wall section. The second iron oxide concentration is different from the first iron oxide concentration.