Cooling device and manufacturing method therefor

A method for manufacturing a cooling device for a heating element of immersed type liquid cooling server, comprising:

• providing a metal substrate, mounting holes being left at four corners of the metal substrate for fastening the metal substrate through the mounting holes with fastening screws to corresponding threaded holes on a substrate of the heating element;
• increasing surface roughness, vaporization cores, bubble generation points, and boiling performance of the heating element by forming a porous metal covering layer on a region of the metal substrate corresponding to the heating element;
• and
• providing the metal substrate above the heating element and covering the heating element, wherein the porous metal covering layer is located above the heating element and covers the heating element, and the porous metal covering layer is exposed on a surface of the metal substrate remote from the heating element and has a thickness of less than 3 mm;
• wherein the step of forming the porous metal covering layer on the region of the metal substrate corresponding to the heating element includes forming the porous metal covering layer by powder sintering the region of the metal substrate corresponding to the heating element.