Heat-resistant alloy member, alloy member for fuel cell, collector member for fuel cell, cell stack, and fuel cell apparatus

Abstract

The present invention provides a heat-resistant alloy member which hardly causes external diffusion of Cr, an alloy member for a fuel cell, a collector member for a fuel cell, a cell stack, and a fuel cell apparatus. The surface of a collector base material 201 containing Cr is coated with a Cr diffusion preventing layer 203 made of an oxide containing Zn and Mn and a coating layer 202 made of an oxide containing Zn is formed on the surface of the Cr diffusion preventing layer 203 . The coating layer 202 preferably contains at least one kind of Al and Fe as a trivalent or higher valent positive metal element.

1 . A heat-resistant alloy member comprising a Cr diffusion preventing layer made of an oxide containing Zn and Mn, and an alloy member containing Cr, whose surface is coated with the Cr diffusion preventing layer. 
   
   
       2 . The heat-resistant alloy member according to  claim 1 , wherein a coating layer made of an oxide containing Zn is formed on the surface of the Cr diffusion preventing layer. 
   
   
       3 . The heat-resistant alloy member according to  claim 1 , wherein the Cr diffusion preventing layer and the coating layer have conductivity at high temperature. 
   
   
       4 . The heat-resistant alloy member according to  claim 3 , wherein the coating layer contains Zn and a trivalent or higher valent positive metal element. 
   
   
       5 . The heat-resistant alloy member according to  claim 4 , wherein the coating layer contains at least one kind of Al and Fe as the trivalent or higher valent positive metal element. 
   
   
       6 . The heat-resistant alloy member according to  claim 3 , wherein the coating layer has conductivity of 1 S·cm −1  or more at a temperature of 550 to 900° C. 
   
   
       7 . The heat-resistant alloy member according to  claim 1 , wherein the Cr diffusion preventing layer is made of (Zn,Mn)Mn 2 O 4 . 
   
   
       8 . The heat-resistant alloy member according to  claim 2 , wherein a film containing Zn is formed on the surface of an alloy member containing Mn and Cr and, after subjecting to a heat treatment, the Cr diffusion preventing layer and the coating layer are sequentially formed on the surface of the alloy member. 
   
   
       9 . An alloy member for a fuel cell, comprising the heat-resistant alloy member according to  claim 1  for a fuel cell. 
   
   
       10 . A collector member for a fuel cell, wherein a collector member for collecting a current from a fuel cell is made of the heat-resistant alloy member according to  claims 3 . 
   
   
       11 . A cell stack comprising the collector member for a fuel cell according to  claim 10 , and plural fuel cells which are electrically connected to each other by interposing the collector member for a fuel cell therebetween. 
   
   
       12 . The cell stack according to  claim 11 , wherein the fuel cell and the collector member for a fuel cell are bonded and electrically connected by a conductive binding material. 
   
   
       13 . A fuel cell apparatus comprising a container, and the cell stack according to  claim 11  housed in the container.