Compositions – Magnetic – With wax – bitumen – resin – or gum
Patent
1991-01-24
1992-12-22
Dixon, Jr., William R.
Compositions
Magnetic
With wax, bitumen, resin, or gum
524401, 524434, 524435, 524403, 428418, 428413, C04B 3504, C08K 300
Patent
active
051732068
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.
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Dickens, Jr. E. Douglas
Mazany Anthony M.
Dixon Jr. William R.
Hudak Daniel J.
Lafferty Samuel B.
Marcantoni Paul
Shust Nestor W.
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