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US 8,524,050 B2Granted
Stainless steel separator for fuel cell having M/MNx and MOyNz layer and method for manufacturing the same
AssigneeHyundai Hysco
InventorsYoo Taek Jeon, Kyeong Woo Chung, Hyun Sik Myung, Yong Sik Yun, Jong In Park, Eun Young Kim
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Abstract
Disclosed herein is a method of manufacturing a stainless steel separator for a fuel cell. The stainless steel separator includes a stainless steel sheet, a first coating layer comprising metal/metal nitride films (M/MNx) (0.5≦x≦1) on a surface of the stainless steel sheet, and a second coating layer comprising a metal oxynitride film (MOyNz) (0.05≦y≦2, 0.25≦z≦1.0).
Claims9
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/MNx) (0.5≦x≦1) on a surface of the stainless steel sheet;
- and
- 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 (MOyNz) (0.05≦y≦2, 0.25≦z≦1.0) comprising the steps of:
- 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 (MOyNz) (0.05≦y≦2, 0.25≦z≦1.0) on the first coating layer.
5 more elements
A method of manufacturing a stainless steel separator for use in a fuel cell with the separator having:
- a sheet composed essentially of stainless steel;
- a first coating layer comprising at least two metal/metal nitride films (M/MNx) (0.55≦x≦1) on a surface of the stainless steel sheet;
- and
- 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 (MOyNz) (0.05≦y≦2, 0.25≦z≦1.0);
- said method comprising the steps of:
- 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
- heat treating the stainless steel sheet having the first coating layer comprising the metal/metal nitride films (M/MN) in an oxygen atmosphere to form a second coating layer via thermal oxidation or plasma oxidation and for transforming a portion of an outermost metal nitride film into a metal oxynitride film (MOyNz) (0.05≦y≦2, 0.25≦z≦1.0).
6 more elements
Dependencies are inferred from the claim text.