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1. (WO2018226966) SYSTÈME DE REVÊTEMENT PAR PLASMA ASSISTÉ PAR CHAMP MAGNÉTIQUE
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

The invention claimed is:

1 . A coating system comprising:

an elongated cathode;

at least one magnetic source located within the cathode; a workpiece surrounding an outer surface of the cathode, the workpiece acting as an anode; and

a vacuum source adapted to create a vacuum around the cathode; the at least one magnetic source being adapted to cause a magnetic field to linearly move along the cathode.

2. The system of Claim 1 , further comprising an interior wall of the workpiece, surrounding the outer surface of the cathode, defining part of a vacuum chamber connected to the vacuum source.

3. The system of Claim 2, further comprising at least one end cap removeably located over at least one opening of the workpiece defining part of the vacuum chamber, the vacuum chamber being entirely within a hollow area inside the workpiece.

4. The system of Claim 2, further comprising at least one seal removeably located over at least one opening of the workpiece to define part of the vacuum chamber, the vacuum chamber being entirely within a hollow area inside the workpiece.

5. The system of Claim 1 , further comprising at least two of the magnetic sources located within the cathode, the magnetic sources being longitudinally arranged relative to each other.

6. The system of Claim 5, wherein the at least two magnetic sources are electromagnets which are longitudinally spaced apart from each other.

7. The system of Claim 1 , further comprising an exterior of the workpiece being exposed to ambient air during plasma coating inside of the workpiece.

8. The system of Claim 1 , further comprising a solid and longitudinally elongated transmission shaft coaxially extending within a hollow center of the cathode, the shaft being attached to the magnetic source and operably moving the magnetic source in longitudinal and rotational directions during plasma coating of an interior wall of the workpiece.

9. The system of Claim 1 , further comprising a process gas emitted into an interior area defined by an interior wall of the workpiece, the gas being used to assist with ionization during plasma arc deposition coating of the interior wall.

10. The system of Claim 1 , wherein the workpiece is a metallic automotive vehicle engine block including an internal piston cylinder which is plasma arc deposition coated with a tetrahedrally bonded amorphous carbon thin film by the cathode.

1 1 . The system of Claim 1 , further comprising:

a plasma arc deposition coating using the cathode having an ion impact energy of at least 10 eV against the workpiece which is metallic; and

a complete coating cycle being no greater than five minutes from when the vacuum is started to when the vacuum ends.

12. A coating system comprising:

an elongated cathode;

at least one magnetic source;

a metallic workpiece including an internal surface defining an internal bore, the internal surface of the workpiece surrounding an outer surface of the cathode; a vacuum chamber being defined by at least the internal surface of the workpiece and at least one member comprising: (a) a removable end cap or (b) a flexible seal, positioned adjacent at least one open end of the bore; and

the at least one magnetic source being located inside the bore of the workpiece during coating of the internal surface of the workpiece.

13. The system of Claim 12, further comprising at least two of the magnetic sources located within the cathode, the magnetic sources being longitudinally arranged relative to each other.

14. The system of Claim 13, wherein the at least two magnetic sources are electromagnets which are longitudinally spaced apart from each other.

15. The system of Claim 12, wherein the at least one magnetic source is located within a hollow center of the cathode.

16. The system of Claim 15, further comprising a solid and longitudinally elongated transmission shaft coaxially extending within the cathode, the shaft being attached to the magnetic source, and the shaft and the magnetic source operably moving longitudinal and rotational directions during plasma coating of the internal surface of the workpiece.

17. The system of Claim 12, further comprising:

a plasma arc deposition coating using the cathode having an ion impact energy of at least 10 eV against the workpiece; and

a complete coating cycle being no greater than five minutes from when vacuum pressure is started to when the vacuum pressure ends.

18. The system of Claim 12, wherein the workpiece is an anode during the coating and a longitudinal length of the cathode is greater than a lateral diameter of the cathode.

19. A coating system comprising:

an elongated cathode;

multiple magnetic sources located within the cathode in a longitudinally spaced apart manner;

a vacuum source connected to a vacuum area surrounding a portion of the cathode; and

the cathode being configured to operably apply a plasma arc deposition coating.

20. The system of Claim 19, wherein the magnetic sources are electromagnets which are energizably controlled by a programmable controller.

21 . The system of Claim 20, further comprising:

an electrical circuit connected to the electromagnets, the controller, the cathode and an anode;

the anode comprising a workpiece to be coated.

22. The system of Claim 19, further comprising:

a workpiece including an elongated internal bore within which is inserted the cathode;

at least one member sealing an open end of the bore; and

the vacuum source reducing pressure within the sealed bore to allow the coating to be applied to an internal and metallic workpiece surface defining the bore.

23. A method for coating a workpiece, the method comprising:

(a) inserting a cathode inside an internal bore of the workpiece;

(b) sealing at least one open end of the bore;

(c) generating an arc in a plasma between the cathode and the workpiece, which acts as an anode; and

(d) using a magnetic field adjacent the cathode to assist in controlling the arc.

24. The method of Claim 23, further comprising:

reducing pressure within the bore for the coating process; and

moving a magnet, internally located within a hollow center of the cathode, relative to the cathode during the coating process.

25. The method of Claim 23, further comprising:

plasma arc deposition coating an internal and metallic workpiece surface surrounding the bore with an ion impact energy of at least 10 eV;

the coating cycle being no greater than five minutes from when vacuum pressure is started to when vacuum pressure ends; and

the internal workpiece surface being coated with a harder material than the remainder of the workpiece adjacent the bore.