Duplex coated steel composite products and method of manufacturi

Details Duplex coated steel composite products and method of manufacturi Duplex coated steel composite products and method of manufacturi

1999-07-22

2000-09-12

Turner, Archene

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

427299, 427327, 4274197, 427569, 427577, 2041921, 20419211, 20419215, 20419216, C23L 1600

Patent

active

061172804

ABSTRACT:
Duplex coated steel composite products comprising a first layer of a nitrd layer formed by applying glow discharge at a current density from 0.001 to 2.0 mA/cm.sup.2 to the surface of metal parts by using gaseous ammonia and gaseous hydrogen while maintaining the temperature of the metal parts at 300 to 650.degree. C., thereby applying plasma nitriding and a second layer comprising a hard film comprising a nitride, carbide and/or carbonitride of one or more of elements selected from Ti, Zr, Hf, V, Nb, Ta and Cr coated on the first layer by the PVD method of a laminate film or a gradient laminate film of such hard film. The treated products are excellent in adhesion with the substrate and durability and have both oxidation resistance and wear resistance.

REFERENCES:
patent: 4749587 (1988-06-01), Bergmann et al.
patent: 4842710 (1989-06-01), Freller et al.
patent: 5330853 (1994-07-01), Hofmann et al.

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