HEAT EXCHANGER AND MANUFACTURING METHOD OF HEAT EXCHANGER

To provide a heat exchanger capable of obtaining a cross-sectional shape capable of reducing pressure loss and suppressing occurrence of corrosion on a dissimilar material interface, in the heat exchanger including fins composed of a composite material.SOLUTION: A heat exchanger 100 includes a base portion 10, and a plurality of plate-shaped radiation fins 2 disposed on a surface of the base portion 10 in a raised manner. The radiation fins 2 each include a first heat transfer material 21 constituting one surface 2a and another surface 2b, and a second heat transfer material 22 having a heat conductivity higher than that of the first heat transfer material 21, and having an outer surface coated with the first heat transfer material 21. The radiation fins 2 each have a first part 20a including the first heat transfer material 21 and the second heat transfer material 22, and a second part 20b disposed at a tip side in a height direction at least with respect to the first part 20a and including the first heat transfer material 21 and having a thickness smaller than that of the first part 20a.SELECTED DRAWING: Figure 4 【課題】複合材料のフィンを備えた熱交換器であって、圧力損失を低減可能な断面形状を得ることができ、かつ、異種材料界面における腐食の発生も抑制可能な熱交換器を提供する。【解決手段】この熱交換器１００は、ベース部１０と、ベース部１０の表面に立ち上がるように設けられた複数の板状の放熱フィン２とを備える。放熱フィン２は、一方表面２ａおよび他方表面２ｂを構成する第１伝熱材２１と、第１伝熱材２１よりも高い熱伝導率を有し、第１伝熱材２１により外表面が覆われた第２伝熱材２２と、を含んで構成される。放熱フィン２は、第１伝熱材２１および第２伝熱材２２を含む第１部分２０ａと、少なくとも第１部分２０ａよりも高さ方向の先端側に設けられ、第１伝熱材２１を含み第１部分２０ａよりも厚みが小さい第２部分２０ｂと、を有する。【選択図】図４