Laser applied multifunctional coatings for marine and aerospace vehicles
A method of producing a functional layer on a substrate, such as metal would include the steps of applying an electrostatic powder as a primer coat to the substrate, after which the primer is cured by a laser. A conductive layer is then applied and cured to form a functional layer, such as conductive tracings over all or a portion of the substrate.
1. A method of applying a functional layer to a substrate, comprising the steps of:
a) spraying an electrostatic powdered primer coat resin onto the surface of the substrate;
b) curing said powdered primer coat;
c) spraying a powdered conductive layer onto said cured powdered primer coat; and
d) curing said powdered conductive layer;
e) spraying an electrostatic powdered top coat layer onto said cured conductive layer;
f) curing said powdered top coat layer;
wherein said cured powdered conductive layer is in the form of conductive traces over the surface of the substrate.
2. The method in accordance with claim 1 , wherein said curing steps b), d) and f) are performed by laser scanning.
3. The method in accordance with claim 2 , consisting of the steps of:
g) dividing the substrate in a plurality of sections covering the entire surface of the substrate;
h) scanning a first set of said plurality of sections with said laser during said curing step b) over the entire surface of said first plurality of sections;
i) scanning, in a sequential manner with said laser, all of the remaining sections of said plurality of sections during curing step b);
j) scanning said first set of said plurality of sections with said laser during curing step d);
k) scanning, in a sequential manner with said laser, all of the remaining sections of said plurality of sections during curing step d);
l) scanning said first set of said plurality of sections with said laser during curing step f); and
m) scanning, in a sequential manner with said laser, all of the remaining sections of said plurality of sections during curing step f).
4. The method in accordance with claim 3 , further including the step of tapering the thermal gradient between adjacent sections of said plurality of sections during curing steps b), d) and f).
5. The method in accordance with claim 4 , further including the step of maintaining the curing temperature at or above the melt temperature of the various coats between adjacent sections of said plurality of sections by utilizing high intensity lamps.
6. The method in accordance with claim 1 , further including the step of applying at least a pigment layer between said top coat layer and said conductive layer.
7. The method in accordance with claim 1 , wherein the substrate is metallic and further including the step of connecting a power source between said metallic substrate and said conductive traces to produce a de-icing device.
8. The method in accordance with claim 1 , wherein the substrate is the metallic surface of a ship's hull and further including the steps of connecting a power source between said metallic substrate and said conductive traces to produce a device for providing chlorine bubbles used to cleanse said metallic substrate.
9. The method in accordance with claim 1 , wherein said powdered conductive layer includes PBT and graphite.
10. The method in accordance with claim 1 , wherein said graphite is 65% by volume of said powdered conductive layer.
11. The method in accordance with claim 10 , wherein said powdered conductive layer includes 2.5% by weight of copper.