US 8,617,769 B2Granted

Coating body

AssigneeNGK Insulators, Ltd.

InventorsMakoto Ohmori, Takashi Ryu, Toshiyuki Nakamura

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Abstract

Powders of respective metal elements (Mn, Co) constituting a transition metal oxide (MnCo2O4) having a spinel type crystal structure are used as a starting material of the coating film. A film of a paste containing the mixture of the powders is formed on the surface of the interconnector, and with this state, the paste is sintered to form the coating film. In the coating body, a chromia layer including Cr2O3, a first layer including elements of Mn, Co, Fe, Cr, and O, and a second layer including elements of Mn, Co, Fe, and O are provided in this order from the side close to the interconnector at the boundary between the coating film and the interconnector. With this structure, the coating film is difficult to be peeled even if the coating body is placed in a severe temperature change.

Claims7

Dependent claims

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 AB2O4, 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 μm or more, among the plural sides constituting an outline of the crystal face,
wherein a first layer having a thickness of 1 to 7 μm 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 μm.

1 more element

Dependencies are inferred from the claim text.