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Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-02-11

An apparatus for plating NdFeB magnet includes a cathode and a target source holder defining a predetermined distance of 5 mm to 200 mm therebetween. A pulse bias power supply having a first positive terminal connected to an anode and a first negative terminal connected to the cathode. A DC bias power supply having a second positive terminal connected to the anode and a second negative terminal connected to the target source holder. The anode is connected to the earth ground. A method for plating the NdFeB magnet includes steps of maintaining the predetermined distance of 5 mm to 200 mm between the cleaned NdFeB magnet and the target source material, increasing a first electric potential to the cathode and a second electric potential to the target source holder with the second electric potential greater than the first electric potential, and maintaining a potential differential of 0V to 500V therebetween.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2015-01-28

The present invention provides an R-T-B-M sintered magnet made from an R-T-B-M alloy via a series of processes steps such as melting, hydrogen decrepitation, milling, molding, sintering, and aging treatment. The process steps of hydrogen decrepitation, milling, and molding are performed under inert conditions. Oxygen is avoided during the milling process. The ultrafine powders, which are abundant in rare earth elements, are not required to be wiped off. R is at least one element selected from rare earth elements including Sc and Y. T is at least one element selected from Fe and Co. B means boron. M is at least one element selected from Ti, Ni, Nb, Al, V, Mn, Sn, Ca, Mg, Pb, Sb, Zn, Si, Zr, Cr, Cu, Ga, Mo, W and Ta. The weight content of the related elements are: 29%R35%, 62%T70%, 0.1%M1.8%, 0.9%B1.2%. The weight content of oxygen in the magnet is equal to or less than 0.07%.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-08-17

According to the present invention there is provided a method for disposing an anti-corrosion coating on Nd-Fe-B permanent magnets and an Nd-Fe-B permanent magnet including an improved anti-corrosion coating. The method includes the steps of:a) Performing a pre-treatment of the Nd-Fe-B permanent magnets;b) Fixing the Nd-Fe-B permanent magnets on a jig and placing the same in a multi-arc sputtering equipment;c) Evacuating the multi-arc sputtering equipment with a vacuum system until the pressure reaches 110^(-2)Pa to 310^(-2)Pa, then introducing argon gas until the pressure reaches 110^(-1)Pa to 510^(-1)Pa, starting bias voltage treatment of the Nd-Fe-B permanent magnets for 1 to 10 minutes at 800V to 1000V;d) Stopping bias voltage treatment and then evacuating the multi-arc sputtering equipment until the pressure reaches 110^(-3)Pa to 810^(-3)Pa, then refilling argon gas until the pressure reaches 310^(-1)Pa to 510^(-1)Pa, then starting arc deposition from a target source and maintain a DC current between 50A to 70A, turn on bias voltage and maintain voltage between 100V to 200V, and maintain coating the magnets for 0.1 to 2h;e) Cooling down on 20C to 100C and taking out the Nd-Fe-B permanent magnets from the multi-arc sputtering equipment;f) Spray coating of the Nd-Fe-B permanent magnets with an epoxy resin; andg) Placing the Nd-Fe-B permanent magnets into an oven and heat-treating the same at a treatment temperature between 100C to 220C for 10min to 120min.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-06-08

According to the present invention there is provided a method of bonding Nd-Fe-B permanent magnets together. The method includes the steps of:a) degreasing and activating adhesion surfaces of the Nd-Fe-B permanent magnets;b) coating an insulating adhesive on the adhesion surfaces of the Nd-Fe-B permanent magnets such that a thickness of an adhesive layer is 1 to 100m;c) initial curing the insulating adhesive at a temperature T1 of 20C to 250C for 0.1 h to 24h;d) stacking the Nd-Fe-B permanent magnets together in a fixing tool (4) and curing the insulating adhesive under pressure of 0.1MPa to 10 MPa and a temperature T2 of 150C to 350C for 0.1h to 12h; ande) stop heating and allow to cool down the bonded Nd-Fe-B permanent magnets to room temperature.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-08-17

According to the present invention there is provided a method for disposing an aluminum coating on Nd-Fe-B permanent magnets. The method includes the steps of:a) Performing a pre-treatment of the Nd-Fe-B permanent magnets;b) Fixing the Nd-Fe-B permanent magnets on a jig and placing the same in a multi-arc sputtering equipment;c) Evacuating the multi-arc sputtering equipment with a vacuum system until the pressure reaches 110^(-2)Pa to 310^(-2)Pa, then introducing argon gas until the pressure reaches 110^(-1)Pa to 510^(-1)Pa, starting bias voltage treatment of the Nd-Fe-B permanent magnets for 1 to 10 minutes at 800V to 1000V;d) Stopping bias voltage treatment and then evacuating the multi-arc sputtering equipment until the pressure reaches 110^(-3)Pa to 810^(-3)Pa, then refilling argon gas until the pressure reaches 310^(-1)Pa to 510^(-1)Pa, then starting arc deposition from a target source and maintain a DC current between 50A to 70A, turn on bias voltage and maintain voltage between 100V to 200V, and maintain coating the magnets for 0.5 to 5h;e) Cooling down on 20C to 100C and taking out the Nd-Fe-B permanent magnets from the multi-arc sputtering equipment; andf) Dipping the Nd-Fe-B permanent magnets into a passivating agent for 1 to 20 minutes and then rinse with water.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-08-17

The present invention provides a coating apparatus for NdFeB magnets and a corresponding coating process. The apparatus includes: a vacuum chamber; a source and a cathode being arranged within the vacuum chamber, the source and cathode being positioned to each other in parallel and equidistant; a thermal shield surrounding the source and the cathode; an anode being arranged at a top of the vacuum chamber, wherein the anode and cathode are connected to a positive electrode and negative electrode of a pulsed bias power supply respectively, the anode and source are connected to the positive electrode and negative electrode of a DC bias power supply respectively, and the anode is grounded; an argon gas entrance positioned at a bottom of the vacuum chamber; a vacuum systems being in communication with the vacuum chamber; a furnace door positioned at a front side of vacuum chamber; an observation window positioned at the central of the furnace door; and an optical thermometer being placed outside of the vacuum chamber. The position of the optical thermometer corresponds to that of the observation window.


According to one aspect of the invention, there is provided a vacuum coating device for surface coating of small sized Nd-Fe-B magnets. The device comprises:- a vacuum furnace chamber ;- a drum with mesh sidewalls being rotatable arranged on a rotary shaft inside the vacuum furnace chamber;- at least one target source for vacuum deposition being arranged within the vacuum furnace chamber;- a gas inlet for connecting an argon source; and- an outlet for connecting a vacuum system. The invention further refers to a corresponding vacuum coating method.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-02-12

A method for depositing a composite film on a permanent NdFeB magnet including step of spraying the anti-corrosive film of a composite resin selected from one of epoxy and phenol on the coated permanent NdFeB magnet and curing the layered permanent NdFeB magnet at a first final temperature of 120 C. for a first time interval of 30 minutes and at a second final temperature of 170 C. for a second time interval of 30 minutes. The method also includes a step of cooling the chamber by feeding a fluid of water at a cooling temperature of between 0 C. and 5 C. through the chamber and the arc source. The method further includes a step of adjusting the target source of metal and a control magnet of the arc source defining a predetermined distance of between 1 cm and 10 cm between the target source of metal and the control magnet of the arc source.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-02-11

The present invention provides a method for depositing aluminum on a permanent NdFeB magnet including a step of cooling the chamber and the arc source by feeding a fluid of water at a cooling temperature of between 0 C. and 5 C. through the chamber and the arc source. The method also includes a step of adjusting a target source and a control magnet of the arc source in the chamber of the multi-arc ion plating apparatus to define a predetermined distance of between 1 cm and 10 cm. The step of depositing the film of aluminum further including steps of applying a current of between 50 A and 70 A and an electrical potential of between 100V and 200V to the target source of aluminum and directing the ions of aluminum using the arc source to the purified permanent NdFeB magnet for a time period of between 0.5 hours and 5 hours.


Patent
Yantai Shougang Magnetic Materials Inc. | Date: 2016-05-11

The present invention provides a method for forming an aluminum hard film coating on the surface of Nd-Fe-B magnets. The method includes the following process steps:a) vacuum plating of aluminum on the surface of Nd-Fe-B magnet thereby forming an aluminum film; andb) forming an aluminum oxide layer on the surface of the aluminum film by anodic oxidation.

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