Method for manufacturing three-dimensional object, three-dimensional object, titanium-containing intermediate three-dimensional object, and titanium-containing three-dimensional object

A three-dimensional object manufactured by a method, the method including:

• a modeling step of modeling an intermediate object by applying a binding fluid to a titanium-containing metal powder, the modeling step further including:
• a metal powder layer forming step of forming a metal powder layer by supplying the titanium-containing metal powder to an area of flat shape;
• and
• a binding fluid application step of applying the binding fluid to a partial area of the metal powder layer based on a planar shape of a three-dimensional modeling side layer among a plurality of three-dimensional modeling side layers into which the three-dimensional object is divided along a predetermined direction, whereby the titanium-containing metal powder in the partial area is bound to form an intermediate modeling side layer of the intermediate object;
• and
• a sintering step of sintering the intermediate object to produce the three-dimensional object, wherein
• the modeling step is performed in a vacuum or inert gas atmosphere,
• the metal powder layer forming step and the binding fluid application step are repeated in order, whereby the intermediate modeling side layers are stacked in succession to form the intermediate object,
• the three-dimensional object comprising:
• a surface layer neighboring area including a topmost three-dimensional modeling side layer of the three-dimensional object stacked in the modeling step has a porosity higher than that of a core area in an inside of the three-dimensional object;
• and
• multiple pits and projections at a surface of the three-dimensional object.