Engine piston and method of manufacturing the same

A method of manufacturing an engine piston,

• the method comprising:
• performing upper-body formation of forming an upper body as an upper portion of a piston body in the engine piston by pressing a powder-type sintered material;
• performing lower-body formation of forming a lower body as a lower portion of the piston body in the engine piston by pressing a powder-type sintered material;
• performing bonding of forming the piston body by providing a brazing material between the upper body and the lower body and brazing the upper body and the lower body to each other while simultaneously sintering and bonding a sintered material;
• performing machining of removing pores from a surface of the piston body by machining the surface of the piston body;
• and
• performing heat treatment of forming a passive film by performing at least one of nitriding heat treatment or oxidation heat treatment on the surface of the piston body.