Firing jig and method for manufacturing metal-impregnated ceramic fired body

Abstract

A firing jig for impregnating a metal into a ceramic formed body including a first mounting surface for mounting the ceramic formed body directly, or via the metal in a form of granules, or via a porous support; and a second mounting surface adjacent to the first mounting surface and for placing the metal in the form of granules, wherein the second mounting surface includes a slope that slopes downward toward the first mounting surface.

1 . A firing jig for impregnating a metal into a ceramic formed body,
 the firing jig comprising: a first mounting surface for mounting the ceramic formed body directly, or via the metal in a form of granules, or via a porous support; and a second mounting surface adjacent to the first mounting surface and for placing the metal in the form of granules,   wherein the second mounting surface comprises a slope that slopes downward toward the first mounting surface.   
     
     
         2 . The firing jig according to  claim 1 , wherein the second mounting surface comprises the slope with an average gradient of 5° to 85°. 
     
     
         3 . The firing jig according to  claim 1 , wherein the second mounting surface comprises a partition plate for controlling a direction of flow when the metal in the form of granules is melted and flows on the second mounting surface. 
     
     
         4 . The firing jig according to  claim 1 , wherein the ceramic formed body comprises a hollow portion extending from one end surface to another end surface,
 wherein the firing jig comprises a protrusion for inserting into the hollow portion from a side of the one end surface or the other end surface, and   wherein the protrusion comprises the slope of the second mounting surface.   
     
     
         5 . The firing jig according to  claim 4 , wherein the protrusion has a shape selected from any one of shapes of a cone, a deformed cone obtained by deforming part or all of a generatrix of the cone into a curve, a frustum, and a deformed frustum in which part or all of a generatrix of the frustum is deformed into a curve. 
     
     
         6 . The firing jig according to  claim 4 , wherein a ratio of a height from a lowest point of the first mounting surface to a top of the protrusion to a height from the lowest point of the first mounting surface to a top of the ceramic formed body is 1% to 200%. 
     
     
         7 . The firing jig according to  claim 1 , comprising a wall surface erected so as to surround the first mounting surface. 
     
     
         8 . The firing jig according to  claim 7 , comprising the second mounting surface between the wall surface and the first mounting surface. 
     
     
         9 . The firing jig according to  claim 7 , wherein a ratio of a height from a lowest point of the first mounting surface to a top of the wall surface to a height from the lowest point of the first mounting surface to a top of the ceramic formed body is 1% to 200%. 
     
     
         10 . The firing jig according to  claim 1 , containing 80% by mass or more in total of one or more selected from carbon, silicon carbide, boron nitride, tantalum carbide, alumina, and platinum. 
     
     
         11 . The firing jig according to  claim 1 , wherein one or both of the first mounting surface and the second mounting surface comprises a coating layer containing a material that is inert to all of a material that constitutes the first mounting surface, a material that constitutes the second mounting surface, a material that constitutes the ceramic formed body, and the metal. 
     
     
         12 . The firing jig according to  claim 1 , wherein the ceramic formed body comprises a honeycomb structure portion having an outer peripheral wall and partition walls disposed on an inner peripheral side of the outer peripheral wall and partitioning a plurality of cells forming flow paths from one end surface to another end surface. 
     
     
         13 . The firing jig according to  claim 1 , wherein the ceramic formed body contains silicon carbide, and the metal in the form of granules contains metallic silicon. 
     
     
         14 . A method for manufacturing a metal-impregnated ceramic fired body, comprising:
 preparing the firing jig according to  claim 1 ;   placing the ceramic formed body on the first mounting surface of the firing jig directly, or via the metal in the form of granules, or via the porous support;   placing the metal in the form of granules on the second mounting surface of the firing jig; and   heating the metal at or above a melting point thereof in a state where the ceramic formed body is placed on the first mounting surface and the metal in the form of granules is placed on the second mounting surface, so that the ceramic formed body is fired while the metal is impregnated into the ceramic formed body, thereby obtaining a metal-impregnated ceramic fired body.   
     
     
         15 . The manufacturing method according to  claim 14 , wherein the metal-impregnated ceramic fired body is a heat exchanger. 
     
     
         16 . The manufacturing method according to  claim 14 , wherein the metal-impregnated ceramic fired body has a porosity of 30% or less.