Coating formulation and application of organic passivation...

H - Electricity – 01 – F

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H01F 1/057 (2006.01) B22F 1/02 (2006.01) C23C 26/00 (2006.01)

Patent

CA 2546833

The present disclosure relates to coating formulations for neodymium-iron- boron type magnetic powders manufactured from rapid solidification processes for the purpose, inter alia, of corrosion and oxidation resistance when exposed to aggressive environments. The coating formulation preferably contains an epoxy binder, curing agent, an accelerating agent, and a lubricant. By incorporating coupling agents and optionally, other specialty additives with the magnetic powder and the organic epoxy components, additional oxidation and corrosion prevention, enhanced adhesion and dispersion between the filler and matrix phases can be achieved. This disclosure relates to all such rare earth-transition metal-boron (RE~TM-B) powders produced by rapid solidification and encompasses both the bonded magnet products that include combinations of the materials mentioned and the application processes.

La présente invention concerne des formulations de revêtement pour des poudres magnétiques du type néodyme-fer-bore produites selon des procédés de solidification rapide, et devant, entre autres, résister à la corrosion et à l'oxydation lorsqu'elles sont exposées à des environnements agressifs. Une telle formulation de revêtement contient un liant époxy, un durcisseur, un accélérateur et un lubrifiant. En incorporant des agents de couplage et, éventuellement, d'autres additifs spéciaux à la poudre magnétique et au composant époxy organique, on obtient en outre une protection contre l'oxydation et la corrosion, une meilleurs adhérence entre la charge et les phases de matrice et une meilleure dispersion. L'invention concerne toutes les poudres du type terre rare-métal de transition-bore produites par solidification rapide, y compris les produits magnétiques agglomérés comprenant des combinaisons des matériaux mentionnés, ainsi que les procédés d'application associés.

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