Abstract: The present invention provides a method for preparing a rare earth permanent magnet material. The preparation method of the present invention comprises atomizing spray process and infiltrating process, wherein the atomizing-sprayed sintered rare earth magnet is placed in a closed container before infiltrating. Through the atomizing spray process a solution containing a heavy rare earth element is coated on the surface of a sintered R1-Fe(Co)—B-A-X-M rare earth magnet, and after baking, heat treatment is performed to infiltrate the sprayed heavy rare earth element to the grain boundary phase of the sintered rare earth magnet. This method decreases the amount of a heavy rare earth element used, increases the coercive force of magnets with a little decrease of remanence, decreases the remanence temperature coefficient and coercive force temperature coefficient of the magnet, and improves resistance of the magnet against demagnetization at a high temperature.

Abstract: The present invention provides a method for preparing a permanent magnet material, the method comprising coating step and infiltrating step, wherein, coating a rare earth element-containing substance on the surface of a permanent magnet, the magnet having a thickness of 10 mm or less at least in one direction, then placing the magnet into a container, vacuuming to an atmospheric pressure of below 10 Pa, closing the passageway, and then heat treating the closed container. Using the method of the present invention enables the rare earth element to infiltrate homogeneously with a high permeability. In addition, the present invention may have a lower production cost, significantly increase coercive force of the permanent magnet material, but decrease the remanence very little.

Abstract: An infiltration device comprises a heating room, a rotary tray, a rotary bracket, a material box, an elevating mechanism and a transmission device, wherein the heating room has an annular groove, and the rotary tray is arranged below an opening end at a lower end of the heating room; the rotary bracket is installed on the rotary tray; the material box is arranged on the rotary bracket; the rotary tray and the material box can move upward and downward under the action of the elevating mechanism; the rotary bracket can spin in the annular groove and revolve around a central axis of the rotary tray under the action of the transmission device. The infiltration method provided by the invention comprises the steps of charging, vacuum-pumping, high temperature infiltrating, cooling, discharging, etc.

Abstract: The present invention provides a method for improving coercive force of magnets, this method comprises steps as follows: S2) coating step: coating a coating material on the surface of a magnet and drying it; and S3) infiltrating step: heat treating the magnet obtained from the coating step S2). The coating material comprises (1) metal calcium particles and (2) particles of a material containing a rare earth element; the rare earth element is at least one selected from Praseodymium, Neodymium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium and Lutetium. The method of the present invention can significantly increase coercive force of a permanent magnet material, while remanence and magnetic energy product hardly decrease. In addition, the method of the present invention can significantly decrease the amount of a rare earth element, and accordingly, decrease the production cost.

Abstract: The disclosure discloses a method for preparing a permanent magnet material. In this method, an ionic liquid electroplating process is used to electroplate a heavy rare earth metal onto a surface of a sintered magnet to form a magnet with a coating, wherein the sintered magnet has a thickness of 10 mm or less in at least one direction; in the ionic liquid electroplating process, an electroplating solution comprises an ionic liquid, a heavy rare earth salt, a group VIII metal salt, an alkali metal salt and an additive, an anode is a heavy rare earth metal or a heavy rare earth alloy, a cathode is the sintered magnet, an electroplating temperature is 20-50° C., an electroplating time is 15-80 min. The preparation method of the disclosure can improve an intrinsic coercive force of the magnet with low cost and high production efficiency. A utilization rate of heavy rare earth is high.

Abstract: A spraying device comprises: a conveyer comprising a mesh crawler belt configured to carry an object to be sprayed; a baking chamber for heating the object to be sprayed; a spraying chamber having at least one atomizing nozzle disposed within the spraying chamber, the atomizing nozzle being configured to uniformly spray a coating solution on a surface of the object to be sprayed; a cleaning chamber for cleaning the mesh crawler belt and recycling the coating solution carried by the mesh crawler belt; and a solution storage apparatus for storing the coating solution that the spraying chamber needs for spraying; wherein the mesh crawler belt passes successively through the baking chamber, the spraying chamber and the cleaning chamber. The device of the present invention can ensure uniformity of the thickness of a coating layer on the magnet. In addition, the device can improve spraying efficiency and save raw material.

Abstract: The present invention provides a method for preparing a permanent magnet material, the method comprising coating step and infiltrating step, wherein, coating a rare earth element-containing substance on the surface of a permanent magnet, the magnet having a thickness of 10 mm or less at least in one direction, then placing the magnet into a container, vacuuming to an atmospheric pressure of below 10 Pa, closing the passageway, and then heat treating the closed container. Using the method of the present invention enables the rare earth element to infiltrate homogeneously with a high permeability. In addition, the present invention may have a lower production cost, significantly increase coercive force of the permanent magnet material, but decrease the remanence very little.

Abstract: The present invention provides a rare earth permanent magnet material and manufacturing method thereof. The manufacturing method of the present invention comprises a multi-arc ion plating step and a infiltrating step, wherein multi-arc ion plating process is adopted to deposit a metal containing a heavy rare earth element on a surface of a sintered neodymium-iron-boron magnet which has a thickness of 10 mm or less in at least one direction; and then heat treatment is performed on the sintered neodymium-iron-boron after deposition. The sum of an intrinsic coercive force (Hcj, in unit of kOe) and a maximum magnetic energy product ((BH)max, in unit of MGOe) of the permanent magnet material of the present invention is 66.8 or more. Moreover, the manufacturing method of the present invention has high production efficiency and does not increase harmful substances, and the price of devices is relatively low.

Abstract: The present invention provides a method for improving coercive force of magnets, this method comprises steps as follows: S2) coating step: coating a coating material on the surface of a magnet and drying it; and S3) infiltrating step: heat treating the magnet obtained from the coating step S2). The coating material comprises (1) metal calcium particles and (2) particles of a material containing a rare earth element; the rare earth element is at least one selected from Praseodymium, Neodymium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium and Lutetium. The method of the present invention can significantly increase coercive force of a permanent magnet material, while remanence and magnetic energy product hardly decrease. In addition, the method of the present invention can significantly decrease the amount of a rare earth element, and accordingly, decrease the production cost.

Abstract: The present invention provides a method for preparing a rare earth permanent magnet material. The preparation method of the present invention comprises atomizing spray process and infiltrating process, wherein the atomizing-sprayed sintered rare earth magnet is placed in a closed container before infiltrating. Through the atomizing spray process a solution containing a heavy rare earth element is coated on the surface of a sintered R1-Fe(Co)—B-A-X-M rare earth magnet, and after baking, heat treatment is performed to infiltrate the sprayed heavy rare earth element to the grain boundary phase of the sintered rare earth magnet. This method decreases the amount of a heavy rare earth element used, increases the coercive force of magnets with a little decrease of remanence, decreases the remanence temperature coefficient and coercive force temperature coefficient of the magnet, and improves resistance of the magnet against demagnetization at a high temperature.