Patent ID: 8617769

Claim:
A coating body comprising: a conductive member made of a metal material containing Fe and Cr; a coating film that is formed to include a transition metal oxide having a spinel type crystal structure represented by a chemical formula AB 2 O 4 , wherein A is at least one type of metal element selected from Mn and Cu, B is at least one type of metal element selected from Co and Mn, and that covers the surface of the conductive member, and spherical particles in which plural crystal faces are exposed to the surface, each of the spherical particles having a side with a length of 1 Î¼m or more, among the plural sides constituting an outline of the crystal face, wherein a first layer having a thickness of 1 to 7 Î¼m and containing elements of A, B, Fe, Cr, and O is interposed at the boundary between the coating film and the conductive member, wherein the Cr concentration in the first layer falls within the range 0.1 to 0.5 times the average value of the Cr concentration in the conductive member, and wherein a diameter of the particles is 5 to 80 Î¼m.