COAT AS WELL AS METHOD AND DEVICE FOR COATING

• US 20140023856A1
• Filed: 09/16/2013
• Published: 01/23/2014
• Est. Priority Date: 03/16/2011
• Status: Abandoned Application

• Current Assignee: Eckart GmbH (Eckart), Maschinenfabrik Reinhausen GmbH (Richard Scheubeck Beteiligungs-Gmbh & Co. KG)
• Original Assignee: Eckart GmbH (Eckart), Reinhausen Plasma GmbH (TDK Corporation)
• Inventors: Wolfrum, Christian, Greb, Marco, Bisges, Michael, Rupprecht, Markus
• Application Number:
  US14/027,738
• Publication Number:
  US 20140023856A1
• Time in Patent Office: Days
• US Class Current: 428/329
• CPC Class Codes: B05B 7/1404 Arrangements for supplying particulate material
• CPC Class Codes: B05B 7/226 the material being originally a particulate material
• CPC Class Codes: C23C 16/06 characterised by the deposition of metallic material
• CPC Class Codes: C23C 16/50 using electric discharges generation and control of plasma in discharge tubes for surface treatment H01J37/32, H01J37/34
• CPC Class Codes: C23C 4/12 characterised by the method of spraying
• CPC Class Codes: C23C 4/134 Plasma spraying
• CPC Class Codes: C23C 8/36 using ionised gases, e.g. ionitriding
• CPC Class Codes: H05H 1/34 Details, e.g. electrodes, nozzles
• CPC Class Codes: H05H 1/42 with provisions for introducing materials into the plasma, e.g. powder, liquid arc stabilising or constricting arrangements H05H1/3405; coaxial protecting fluids H05H1/341; electrostatic spraying, spraying apparatus with means for charging the spray electrically B05B5/00 ; cf. B23K9/324, B05B7/22
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide

Abstract

The invention relates to a method and a device for applying a coating to a substrate, where a plasma jet of a low-temperature plasma is produced by conducting a working gas through an excitation zone. The plasma jet is directed at the substrate, and plate-shaped particles having an average thickness between 10 and 50,000 nanometers and a shape factor in a value range from 10 to 2000 are fed into the plasma jet. The plate-shaped particles are fed into the plasma jet by means of a carrier gas. The plasma jet is produced by exciting the working gas by means of an alternating voltage or a pulsed direct voltage.

Claims

1. A method for application of a coat onto a substrate comprising the steps of:

generating a plasma beam of a low temperature plasma by leading a working gas through an excitation zone; and

,

supplying platelet-shaped particles with a mean thickness between 10 and 50,000 nanometers and a form factor in the value range of 10 to 2000 are supplied into the plasma beam directed at the substrate.

2. The method as recited in claim 1, wherein the platelet-shaped particles are supplied with the help of a carrier gas into the plasma beam.

3. The method as recited in claim 2, wherein the volumetric flow of the carrier gas is in a range of 1 l/min to 15 l/min and the pressure is in a range between 0.5 bar and 2 bar.

4. The method as recited in claim 1, wherein the plasma beam and the substrate can be moved at least occasionally relative to one another during the application of the coat.

5. The method as recited in claim 1, wherein the platelet-shaped particles are supplied into the plasma beam transverse to the direction of propagation of the plasma beam.

6. The method as recited in claim 1, wherein the plasma beam is generated with a gas temperature in a core zone of the plasma beam of less than 900°

C.

7. The method as recited in claim 1, wherein the plasma beam is generated under an ambient pressure in a pressure range of 0.5-1.5 bar.

8. The method as recited in claim 1, wherein the plasma beam is generated through excitation of the working gas by means of an alternating voltage or a pulsed direct voltage.

9. The method as recited in claim 8, wherein the alternating voltage or the pulsed direct voltage is between 500 V and 15 kV and the frequency of the alternating voltage or the pulsed direct voltage is between 10 kHz to 100 kHz.

10. The method as recited in claim 1, wherein platelet-shaped particles, made of metal, are supplied in the plasma beam.

11. The method as recited in claim 10, wherein the metal is selected from the group consisting of aluminium, zinc, tin, titanium, iron, copper, silver, gold, tungsten, silicon or alloys or mixtures thereof.

12. The as recited in claim 10, wherein the metal is selected from the group consisting of oxides, carbides, hydroxides, carbonates, chlorides, fluorides, or mixtures thereof.

13. The method as recited in claim 1, wherein the platelet-shaped particles are additionally coated at least partially with a further layer.

14. The method as recited in claim 13, wherein the further layer is formed by a polymer.

15. The method as recited in claim 1, wherein the substrate is selected from the group consisting of metal, wood, plastics, glass, ceramic, biomaterials or paper.

16. A device for application of a coat onto a substrate, comprising:

a beam generator with an inlet for the supply of a flowing working gas;

an outlet for a plasma beam led by the flowing working gas;

an alternating voltage source or a pulsed direct voltage source which are connected two electrodes of the beam generator, to form a discharge path along which the working gas is led; and

,

at least one feed opening of the beam generator is arranged such that it discharging in an area of the discharge path and through which plate-shaped particles are supplied to the plasma beam.

17. The device as recited in claim 16, wherein each feed opening is arranged immediately adjacent to the outlet for the plasma beam.

18. The device as recited in claim 16, wherein each feed opening of the beam generator is connected with a swirl chamber for generation of a mixture made up of the platelet-shaped particles and a carrier gas.

19. A coat on a substrate comprises:

platelet-shaped particles, which are at least partially fused with one another; and

,

the platelet-shaped particles have a mean thickness H between 10 and 50,000 nanometers and a form factor F in the value range of 10 to 2000 for application of the coat onto a substrate using a gas-led plasma beam of a low temperature plasma.