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:
Dec. 22, 1992
Filed:
Jan. 24, 1991
E Douglas Dickens, Jr, Richfield, OH (US);
Anthony M Mazany, Akron, OH (US);
The B. F. Goodrich Company, Brecksville, OH (US);
Abstract
Oxidation of fully dense rare earth magnets is reduced when a passivating agent such as an oxidation resistant composition or corrosion inhibitor or combinations thereof, is coated thereon. The oxidation resistant composition is a binary or a ternary composition made from (a) at least one amino containing silane compound such as an aminosilane or a polyaminosilane, or (b) at least one epoxy resin, or (c) an epoxy silane compound, or all three such compounds. The oxidation resistant composition, the corrosion inhibitor, or combinations thereof, passivate the surface of the fully dense rare earth magnets and generally form a highly concentrated coating on the surface thereof. Antidegradants are optionally utilized to improve the performance of the fully dense rare earth magnets with regard to improved oxidation resistant properties and generally include organic phosphorus compounds and/or alcohols. One or more layers of the passivating agent and/or one or more layers of the antidegradant are applied to the fully dense magnet which can be in the form of an end product, an article, or any element or component thereof, and which is desirably substantially free of a binder. Such protective fully dense magnets have excellent high temperature oxidation resistance, corrosion resistance, degradation resistance, and the like.