Compositions: coating or plastic – Coating or plastic compositions – Tractive or friction surface
Patent
1990-10-16
1992-11-03
Clingman, A. Lionel
Compositions: coating or plastic
Coating or plastic compositions
Tractive or friction surface
501 96, C04B 3558
Patent
active
051605376
ABSTRACT:
Coating for conferring good friction properties upon a substrate and comprising a non-equilibrium alloy of chromium and nitrogen. The alloy comprises, per one hundred atoms, from 87 to 68 atoms of chromium and from 13 to 32 atoms of nitrogen and two phases, a cubic microcrystalline chromium phase containing included nitrogen and a quadratic chromium nitride phase with a stoichiometric deficient nitrogen content relative to the Cr.sub.2 N nitride. The ratio of the quadratic nitride lattice parameters is between 1.02 and 1.5. This quadratic nitride was previously unknown and probably can exist only in association with chromium. It resists wear up to five times better than known single-phase chromium-nitrogen alloys and is free of the inherent fragility of two-phase alloys containing hexagonal Cr.sub.2 N nitride. The coatings are obtained by magnetron cathode sputtering of chromium with a nitrogen partial presure in a rare gas atmosphere between a maximum and a minimum determined experimentally.
REFERENCES:
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A. Aubert et al., "Hard chrome and molybdenum coatings produced by physical vapour deposition", Thins Solid-Films, Apr. 1985, vol. 126, Nos. 1/2, pp. 61-67.
J. Danroc et al., "Revetements de chrome et molybdene durs elabores par pulverisation cathodique magnetron", Le Vide, Les Couches Minces, Jan.-Feb. 1986, vol. 41, No. 230, pp. 77-83.
G. Cholvy et al., "Obtention et caracteristation de depots realises dans le ternaire Cr-C-N par PVD", Le Vide, Les Couches Minces, Jan.-Feb. 1986, vol. 41, No. 230, pp. 71-75.
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Fort Pascal
Terrat Jean-Paul
Centre Stephanois de Recherches Mecaniques Hydromecanique et Fro
Clingman A. Lionel
DiNunzio Mary
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