Heat exchanging apparatus and method of manufacture

A method of forming heat exchange surfaces on a core object, comprising:

• arranging a first series of die plates in tandem for linear movement about a first perimeter of a first molding apparatus;
• arranging a second series of die plates in tandem for linear movement about a second perimeter of a second molding apparatus;
• forming each of the first series of die plates to define first parts of one or more heat exchange surfaces;
• forming each of the second series of die plates to define corresponding second parts of one or more of said heat exchange surfaces;
• positioning the first and the second molding apparatus so that corresponding ones of the first and the second die plates face one another while being displaced by the apparatus along an axial direction with respect to an elongated thermally conductive core object;
• placing the core object between the facing ones of the first and the second series of die plates;
• urging the facing die plates to a closed position thus forming full mold cavities corresponding to the heat exchange surfaces about the core object;
• injecting a heated metal slurry into the full mold cavities under a predetermined pressure;
• and
• cooling the heated metal slurry thus forming a substantially continuous void free interface between the core object and the metal slurry when hardened for effective heat transfer across the interface.