A method of producing a rare earth magnetic powder, the method including: heat-treating a mixture containing a SmFeN-based magnetic powder containing Sm, Fe, and N and a modifier powder containing Zn; and dispersing the heat-treated SmFeN-based magnetic powder using a resin-coated metal media or a resin-coated ceramic media.

The disclosure relates to a preparation device and method of forming a ceramic coating on a sintered type NdFeB permanent magnet. The preparation device comprises a holding barrel, a pump body, a spraying system, and a fixture mechanism. The pump body is connected with the holding barrel and the spraying system and the spraying system is located above the fixture mechanism and there is a distance between the spraying system and the fixture mechanism. The fixture mechanism is connected with a recovery bucket through a pipeline, and the recovery bucket is connected with the holding barrel through the pipeline. The spraying system comprises a nozzle, wherein the inlet of the nozzle is connected with the pipeline of the pump body. The fixture mechanism comprises a support plate, an upper recovery trough plate and a lower recovery trough plate, wherein the lower recovery trough plate is located above the support plate.

This invention is directed to a corrosion resistant permanent magnet, to a method for producing a corrosion resistant permanent magnet, and to an intravascular blood pump comprising the magnet. The magnet is corrosion resistant due to a composite coating comprising a metal layer, optionally a metal oxide layer, a layer formed from poly(2-chloro-p-xylylene), and a linker layer between the metal oxide layer and the poly(2-chloro-p-xylylene) layer.

This invention is directed to a corrosion resistant permanent magnet, to a method for producing a corrosion resistant permanent magnet, and to an intravascular blood pump comprising the magnet. The magnet is corrosion resistant due to a composite coating comprising a metal layer, optionally a metal oxide layer, a layer formed from poly(2-chloro-p-xylylene), and a linker layer between the metal oxide layer and the poly(2-chloro-p-xylylene) layer.

A rare-earth magnet is an R-T-B-based rare-earth magnet containing a rare-earth element R, a transition metal element T, and boron B. The rare-earth magnet further contains Cu and Co, while having a Cu concentration distribution with a gradient along a direction from a surface of the rare-earth magnet to the inside thereof, Cu having a higher concentration on the surface side of the rare-earth magnet than on the inside thereof, and a Co concentration distribution with a gradient along a direction from the surface of the rare-earth magnet to the inside thereof, Co having a higher concentration on the surface side of the rare-earth magnet than on the inside thereof. The rare-earth magnet is excellent in corrosion resistance.

The present invention aims to provide a novel magnet, whose surface's insulating property can be increased, and a motor using the same. The present invention provides a magnet comprising a magnet element containing a rare earth element R, a transition metal element T and boron B, and a phosphate layer including manganese-containing phosphate, wherein the phosphate layer is provided on the surface of the magnet element, and the thickness of the phosphate layer is 0.5 m or more.

A method for protecting a neodymium-iron-boron watch magnet against corrosion is provided. The method includes a sandblasting treatment of the watch magnet surface following by an ion implantation in an oxygen plasma or a nitrogen plasma to obtain an impervious surface layer with all of the surface bonds saturated by the implanted ions acting as a barrier against oxidation and preventing corrosion of the watch magnet in a humid environment, under the usual conditions for wearing watches.

An NdFeB magnet includes a magnet body and a composite coating of metal disposed on the body. The compositing coating has a plurality of plating layers disposed on the magnet body to cover and protect the magnet body and improve corrosion resistance of the magnet body. The plating layers include a first, a second, a third, and a fourth plating layers to cover the magnet body. The first plating layer contains Zn. The second plating layer contains a Zinc-Nickel alloy. The third plating layer contains Copper. The fourth plating layer contains Nickel. A method of depositing on a composite layer on an NdFeB magnet body.

A manufacture method that includes positioning the permanent magnet body of which a surface is coated with a coating film for deterioration prevention, a scheduled cleavage portion of the permanent magnet body being located between two fulcrums, which are edge portions of a die, supporting the permanent magnet body, and cleaving the permanent magnet body into a cleaved magnet body and the magnet piece by pressing the scheduled cleavage portion of the permanent magnet body is provided. The manufacture method also includes cutting the coating-film between the cleaved magnet body and the magnet piece by pressing an end portion of the cleaved magnet piece from a pressing side of the scheduled cleavage portion, the end portion being on a side opposite to a cleavage surface side.

Magnets including a coating and related methods are described herein. The coating may include an aluminum layer. The aluminum layer may be formed in an electroplating process.