barriercoating
Barrier coating refers to a protective layer applied to a substrate with the aim of limiting the transmission of gases, moisture, vapors, or liquids. By reducing diffusion, barrier coatings help preserve mechanical integrity, electrical performance, and aesthetic quality in environments where exposure to the outside atmosphere would be detrimental.
Common barrier materials include dense inorganic oxides and nitrides such as aluminum oxide, silicon oxide, silicon
Deposition methods vary by material and application. Techniques include chemical vapor deposition (CVD), physical vapor deposition
Key properties of an effective barrier coating are low permeability to relevant species, strong adhesion, chemical
Applications span electronics (encapsulation for displays and organic photovoltaics), food and pharmaceutical packaging (foil or polymer
Performance can be limited by defects such as pinholes, cracks, or interdiffusion at interfaces. Durability depends