Protective layer for optical coatings with enhanced corrosion and scratch resistance
First Claim
1. A method for making an article with improved corrosion and scratch protection, comprising depositing an optical coating comprising one or more layers on a substrate, depositing a layer comprising an unoxidized or partially oxidized or nitrided metal compound or intermetallic on said optical coating to provide a corrosion and scratch protection layer, wherein said metal compound or intermetallic is selected from the group consisting of metal silicide and metal aluminide, and oxidizing or partially oxidizing said metal compound or intermetallic layer.
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Accused Products
Abstract
An oxidizable metal silicide or metal aluminide is used as one of the outer layers of an optical coating to provide a corrosion and scratch resistant barrier. This layer is initially deposited in an unoxidized or partially oxidized state. In this chemical state it provides corrosion protection to the layers underneath. The metal compound or intermetallic layer has hardness properties greater than most metals and therefore provides significant scratch protection.
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Citations
25 Claims
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1. A method for making an article with improved corrosion and scratch protection, comprising
depositing an optical coating comprising one or more layers on a substrate, depositing a layer comprising an unoxidized or partially oxidized or nitrided metal compound or intermetallic on said optical coating to provide a corrosion and scratch protection layer, wherein said metal compound or intermetallic is selected from the group consisting of metal silicide and metal aluminide, and oxidizing or partially oxidizing said metal compound or intermetallic layer.
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6. The method according to claim 6, wherein said metal portion is zirconium.
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15. An article with improved corrosion and scratch protection, comprising
a substrate, an optical coating comprising one or more layers on the substrate, and an outermost layer comprising a protective metal compound or intermetallic coating, wherein said metal compound or intermetallic is selected from the group consisting of metal silicide and metal aluminide.
Specification