Heat exchanger and production method for heat exchanger

Abstract

Disclosed is a heat exchanger that includes first cells through which a first fluid flows, second cells through which a second fluid flows, and partition walls that partition the first cells and the second cells. The heat exchanger exchanges heat between the first fluid and the second fluid. The partition walls include a frame portion having silicon carbide as a main component and a filling portion that covers a surface of the frame portion and is formed from a metal that fills a void in the frame portion. The partition walls have a surface roughness Ra of 1.0 μm or greater.

1 . A heat exchanger, comprising:
 first cells through which a first fluid flows;   second cells through which a second fluid flows; and   partition walls that partition the first cells and the second cells, wherein   the heat exchanger exchanges heat between the first fluid and the second fluid,   the partition walls include a frame portion having silicon carbide as a main component and a filling portion that covers a surface of the frame portion and is formed from a metal that fills a void in the frame portion, and   the partition walls have a surface roughness Ra of 1.0 μm or greater.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the metal is metal silicon. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein the surface roughness Ra of the partition walls is 5.0 μm or less. 
     
     
         4 . A method for manufacturing a heat exchanger, wherein the heat exchanger includes first cells through which a first fluid flows, second cells through which a second fluid flows, and partition walls that partition the first cells and the second cells and exchanges heat between the first fluid and the second fluid, the method comprising:
 molding a molded body from a mixture including silicon carbide particles, an organic binder, and a dispersion medium;   removing the organic binder included in the molded body to obtain a porous degreased body; and   impregnating an inner side of the degreased body with a metal,   wherein the impregnating an inner side of the degreased body includes heating the degreased body in a state contacting a cluster of metal to a melting point of the metal or higher for impregnation of the metal of an amount equivalent to 1.01 to 1.1 times a pore volume of the degreased body.   
     
     
         5 . The method for manufacturing a heat exchanger according to  claim 4 , wherein the metal is metal silicon.