Production method for aluminum-diamond composite

A production method for an aluminum-diamond composite comprising:

• providing a laminate structure, comprised of a first mold release plate, a first inorganic layer, a composition layer containing a diamond powder, a second inorganic layer, and a second mold release plate in this order, in an opening of a flat plate porous material having the opening so that side surfaces of the laminate structure are separated by a gap from an inner circumferential surface of the flat plate porous material;
• and
• infiltrating a melt of a metal containing aluminum into the porous material and the laminate structure to impregnate the composition layer with the melt, the infiltrating forming in the same infiltrating step each of (a) a composited part containing aluminum and diamond from the composition layer, (b) a metal-containing layer on each of two main surfaces on opposite sides of the composited part, and (c) metal layers on at least side surfaces of the composited part where the gap between the laminate structure and the inner circumferential surface of the porous material had been located,
• wherein the aluminum-diamond composite comprises the composited part containing aluminum and diamond as a flat plate, the metal-containing layers provided on each of the two main surfaces on opposite sides of the composited part, and the metal layers provided on side surfaces of the composited part.