Durable transparent coatings for aircraft passenger windows
A duplex coating scheme and associated method of formation, which includes a siloxane based soft coating and a plasma based SiOxCy hard coating used in combination to improve the durability of acrylic substrates used in aircraft window applications.
1. A method of forming a duplex coating on a substrate, the method comprising:
depositing a polysiloxane adherent coating on a surface of the substrate; and
depositing a transparent hard coating of SiO x C y on said polysiloxane adherent coating using a plasma based chemical vapor deposition process.
2. The method of claim 1 , wherein said substrate comprises a stretched acrylic substrate.
3. The method of claim 1 , wherein the polysiloxane adherent coating comprises a thickness of between about 4 and 5 microns.
4. The method of claim 1 , wherein the plasma based chemical vapor deposition coating comprises a thickness of between about 4 and 5 microns.
5. The method of claim 1 , further comprising:
cleaning said polysiloxane adherent coated substrate to remove contaminants.
6. The method of claim 5 , wherein said cleaning comprises ultrasonic cleaning in solvents or aqueous detergents.
7. The method of claim 5 , wherein said cleaning comprises sputter cleaning in a vacuum environment using inert ions and/or oxygen ions.