EVAPORATOR HAVING CORE FORMATION SITE OF ETCHED FIBER AND MANUFACTURE OF THE SAME

摘要

PURPOSE: To increase the amounts of fluid brought into contact with an evaporation face, and to improve cooling efficiency by constituting the materials of an evaporator to be graphite and Cu, providing plural pin fins on the surface, and providing plural core formation sites in the surface region. ;CONSTITUTION: A heat pipe 10 is constituted of an integrated circuit 12, a package 13, a thermal diffuser 15, a fluid 16, and a condenser 18 or the like, and an evaporator 30 is housed in evaporation 17. The evaporator 30 is formed of a laminate 31 of graphite fibers and Cu. The thermal conductivity of the graphite fibers is made higher in an axial direction, and a thermal expansion coefficient is made lower in the axial direction. Moreover, the evaporator 30 is notched by machine work or the like for increasing a surface area, and pin fins 33 are formed. Core formation sites, having microscopically incurved cavities for holding small bubbles are formed on the surfaces of the pin fins 33. Thus, the surface area can be increased, and the contact face with the fluid 16 can be increased, and heat can be diffused effectively.;COPYRIGHT: (C)1994,JPO