Coating technique

Details Coating technique Coating technique

1999-04-01

2001-01-23

Sheehan, John (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S262000, C148S579000, C148S678000, C427S226000, C427S376800

Reexamination Certificate

active

06176945

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to coatings as more particularly to coatings formed from zinc dialkyldithiophosphate derivatives.
2. Description of the Related Art
Surface coatings are of great importance in modern technology. The number of surface coatings applications is considerable and the demands on surface coatings continues to rise. In tribological applications, coatings are used to control friction and wear. The engine oil additive, zinc dialkyldithiophosphate (ZDDP), has been used in engine oil formulations for over 50 years due to its antiwear and antioxdant properties. ZDDP functions as an antiwear agent by forming a protective film or coating at the surfaces in sliding contact. These antiwear or tribochemical (or otherwise known as tribological) films protect the metal surfaces from excessive wear.
The present invention recognizes new applications of these ZDDP materials.
It is an object of the present invention to provide a novel coating technique.
It is another object of the present invention to provide a film formed from a ZDDP derivative material on a substrate.
SUMMARY OF THE INVENTION
Briefly stated, the invention involves a method of forming an annealed film or ZDDP derivative material on a substrate, comprising the steps of
selecting a substrate which is reactive with ZDDP,
exposing said substrate to said atmosphere containing ZDDP for a sufficient period of time and at a sufficient temperature, so as to cause said ZDDP to thermally decompose to form a film on said substrate; and
annealing said film.
In another of its aspects, the invention provides a method of coating a substrate with a zinc dialkyldithiophosphate (ZDDP) material, comprising the steps of:
selecting a substrate which is reactive with the ZDDP material;
providing an atmosphere containing the ZDDP material at a predetermined concentration; and
exposing the substrate to the atmosphere for a sufficient period of time and at a sufficient temperature, so as to cause the ZDDP material to form a layered substrate having a layer of a ZDDP derivative material thereon; and
annealing the layered substrate.
In another of its aspects, the invention provides a substrate having a ZDDP derivative material coated thereon according to the method as defined herein above.
In still another of its aspects, the invention provides a coated material comprising a substrate having gold constituent and a surface having a ZDDP derivative material coated thereon.
In yet another aspect of the present invention, there is provided a substrate with an annealed film of ZDDP derivative material thereon.


REFERENCES:
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patent: 5451333 (1995-09-01), Waddoups et al.
Barcroft et al, The Mechanism of Action of Zinc Thiophosphates as Extreme Pressure Agents, Wear, 77, 1982, pp. 355-383.
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Rhodes & Stair, Effects of ZDP's on Surface Chemistry . . . Iron Substances. Trib. Trans. vol. 36, 1993 pp. 27-34.
Fuller et al, the Use of X-Ray Absorption . . from ZDDP . . . Final Submission to Trib. Letters, Apr. 22, 1999. 21 pages.
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Bancroft et al, Mechanisms of Tribochemical . . . ZDDP Films. Trib. Letters 3, 1997 pp. 47-51.
Fuller et al, X-Ray Absorption . . . Antiwear Films . . Dialkyldithiophosphate. Trib Letters 1995 pp. 367-378.
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Ludema, Kenneth C., “Friction, Wear, Lubrication: A Textbook in Tribology”, 1996, pp. 163-164.

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