Patent ID: 8524050
Filing Date: 2013-09-03
Classification: H01M,Y02E,Y02P

Abstract:
1. A method of manufacturing a stainless steel separator for use in a fuel cell having: a sheet composed essentially of stainless steel; a first coating layer comprising at least two metal/metal nitride films (M/MN at least one second coating layer superimposed on the first coating layer having a thickness of up to 100 nm with the second coating layer comprising a metal oxynitride film (MO performing sputtering with a metal target in an argon atmosphere to deposit a metal film on the first coating layer; performing sputtering in a combined argon-nitrogen atmosphere to form a metal nitride film on the first coating layer comprising multiple metal/metal nitride films (M/MN), repeating the sputtering for forming the metal nitride film while alternating between the argon atmosphere and the combined argon-nitrogen atmosphere; and performing sputtering in a combined nitrogen-oxygen atmosphere to form the second coating layer comprising a metal oxynitride film (MO