The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 1988
Filed:
Jun. 24, 1986
John E Keem, Bloomfield Hills, MI (US);
James D Flasck, Rochester, MI (US);
Ovonic Synthetic Materials Company, Inc., Troy, MI (US);
Abstract
Multilayer protective coatings that are applied over a substrate that comprise a plurality of superimposed multilayer units and methods of making the coatings are disclosed. Each multilayer unit contains two or more superimposed thin layers in which at least two layers are compositionally different. The properties of the resulting coating are a combination of the properties of the individual layers. One layer of a multilayer unit may provide hardness or wear resistance and another layer may provide lubricity, for example. The thickness of the individual layers can be related to the microscopic surface relief of the substrate to which the protective coating is applied. One disclosed multilayer unit comprises three layers: an oxidation resistant layer; a nitride layer; and a layer of disordered boron and carbon material. A method of making the multilayer coatings is provided that includes depositing over a substrate a plurality of superimposed multilayer units. The deposition may be accomplished by sputtering, for example.