Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1994-03-03
1997-04-08
Le, Hoa T.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
427527, 427534, 427563, 427577, 427579, 428336, 428412, 428446, 428447, 4289088, 428913, B32B 904
Patent
active
056186193
ABSTRACT:
An abrasion wear resistant coated substrate product is described comprising a substrate and an abrasion wear resistant coating material comprising carbon, hydrogen, silicon, and oxygen. The abrasion wear resistant coating material has the properties of Nanoindentation hardness in the range of about 2 to about 5 GPa and a strain to microcracking greater than about 1% and a transparency greater than 85% in the visible spectrum. The coated products of the present invention are suitable for use in optical applications such as ophthalmic lenses or laser bar code scanner windows. In the method for making the products, the substrate is first chemically cleaned to remove contaminants. In the second step, the substrate is inserted into a vacuum chamber, and the air in said chamber is evacuated. In the third step, the substrate surface is bombarded with energetic ions and/or reactive species to assist in the removal of residual hydrocarbons and surface oxides, and to activate the surface. After the substrate surface has been etched, a protective, abrasion-resistant coating is deposited by plasma or ion beam deposition. Once the chosen thickness of the coating has been achieved, the deposition process on the substrates is terminated, the vacuum chamber pressure is increased to atmospheric pressure, and the coated substrate products having improved abrasion-resistance are removed from the vacuum chamber.
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Wrobel, A.M., Kryszewski, M. Progr. Colloid Polym. Sci., vol. 85, p. 91 (1991).
Daniels Brian K.
Kimock Fred M.
Knapp Bradley J.
Petrmichl Rudolph H.
Le Hoa T.
Monsanto Company
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