HEAT PIPE AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a heat pipe that improves heat exchange efficiency and a close contact property between a pipe body and a porous metal body layer. SOLUTION: This heat pipe is provided with a pipe body 1 having a hollow part in the closed state; a porous metal body layer 112 formed on the inner peripheral surface of the pipe body 11; and an operating fluid L filled in the pipe body 11. The porous metal body layer 12 is brought into close contact with the inner surface of the pipe body 11. The porous metal body layer 12 is composed of an outer layer and a porous inner layer arranged inside the outer layer. The outer layer is finer than the inner layer, and the inner layer is formed of a foam metal layer in which a skeleton part covering a large number of pores includes therein a large number of internal fine pores smaller in diameter than the aforementioned pores.