SURFACE MODIFICATION METHOD, SURFACE MODIFICATION DEVICE AND CARBURIZING FURNACE MEMBER.

摘要

To provide a surface modification method that can provide carburization resistance at low cost to an iron alloy base material constituting a carburizing furnace member used in a carburizing furnace, a surface modification device, and a carburizing furnace member. [Solution] The problem is solved by a surface modification method including an aluminization step of plating nickel-containing iron alloy base material 1 with molten aluminium to form aluminum plated film 2 on iron alloy base material 1, an excessive aluminium removal step of thermally melting aluminium plated film 2 to remove an excessive portion of molten aluminium plated film 2, and a diffusion layer formation step of heating iron alloy base material 1 from which the excessive portion of aluminium plated film 2 has been removed at a temperature higher than a heating temperature of the excessive aluminium removal step to mutually diffuse constituent elements of iron alloy base material 1 and aluminium included in aluminium plated film 2 so as to form diffusion layer 3.