Manufacturing method for rare earth permanent magnet alloy, neodymium iron boron rare earth permanent magnet and manufacturing method

A rare-earth permanent magnet and rare-earth permanent magnet technology, which is applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problem that the grain size cannot be refined, the alloy sheet temperature is lower than 700°C, and the To reduce the amount of heavy rare earths and other issues, to achieve the effect of low product cost, saving heavy rare earth resources, fine grain boundary phase

Active Publication Date: 2014-12-31
SHENYANG GENERAL MAGNETIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN97,217,372.2 discloses the vacuum quick-setting equipment of twin-stick cooling, as figure 2 As shown, the alloy liquid of the equipment is cast into the gap between the cooling roll 7 and the cooling roll 8 through the funnel 6 to form an alloy sheet 9; The temperature of the alloy sheet after roll rolling is higher than 800°C. Although the double-roll rolling solves the problem of double-sided cooling, it cannot meet the requirements of refining grains, improving grain consistency, and thus increasing coercive force; In order

Method used

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  • Manufacturing method for rare earth permanent magnet alloy, neodymium iron boron rare earth permanent magnet and manufacturing method
  • Manufacturing method for rare earth permanent magnet alloy, neodymium iron boron rare earth permanent magnet and manufacturing method
  • Manufacturing method for rare earth permanent magnet alloy, neodymium iron boron rare earth permanent magnet and manufacturing method

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Embodiment 1

[0043] use Figure 4 A manufacturing method of NdFeB rare earth permanent magnet quick-setting alloy for equipment. First, 600Kg of NdFeB raw material is added to the melting crucible. The heating temperature of the melting crucible is 1430 ° C. After refining, it is cast into the tundish and passes through the gap of the tundish. , the alloy liquid is cast onto the first rotating roll smoothly, the first rotating roll speed is 1.2m / s, the diameter of the first rotating roll is 610mm, the alloy sheet (24) rotates with the rotating roll, and the rotation of the alloy sheet on the first rotating roll The angle is 140°, and then it falls on the second rotating roller, and the free surface contacts the second rotating roller to form an alloy sheet. The speed of the second rotating roller is 1.6m / s, and the diameter of the second rotating roller is 610mm. The upper rotation angle is 58°, the temperature at which the alloy flakes leave the second rotating roller is 590°C, and then t...

Embodiment 2

[0047] a use Figure 5 The double-alloy rare earth permanent magnet quick-setting alloy method of the double-door vacuum quick-setting equipment shown, firstly, the NdFeB quick-setting alloy raw material containing Pr and Nd is loaded into the crucible of the first side-opening induction heater, Close the side-opening furnace door, start heating after vacuuming, heat up to 800°C, and then fill in argon to continue heating to melt the NdFeB raw material into an alloy and refine it. The refining temperature is 1440°C. After refining, pass the molten alloy liquid through The tundish is cast onto the first rotating roll with water cooling to form alloy flakes, and then the alloy flakes fall onto the second rotating roll to continue cooling to form alloy flakes. The temperature at which the alloy flakes leave the first rotating roll is in the range of 820°C. The rotating speed of the first rotating roller is 1m / s, the diameter of the first rotating roller is 810mm, and the rotation...

Embodiment 3

[0051] First, the raw materials containing the ingredients in Table 3 are batched separately according to the serial number. The raw materials sold in the market are praseodymium neodymium alloy, metal lanthanum, metal cerium, metal neodymium, metal terbium, gadolinium iron, holmium iron, dysprosium iron, pure iron, boron iron, niobium Iron, metal gallium, metal zirconium, metal cobalt, metal aluminum, metal copper are selected, and the pure iron, boron iron, metal cobalt, and metal copper in the NdFeB raw material are heated to a temperature range of 300-1500 ° C under vacuum conditions. Control the vacuum degree 5×10 3 Pa to 5×10 -2 Pa range, after 10-240 minutes, fill in argon and add the remaining NdFeB raw materials, and then cast the alloy liquid in molten state on the outer edge of the water-cooled first rotating roller through the gap of the tundish to form Alloy sheet, the alloy sheet rotates with the first rotating roller, then leaves the rotating roller and falls ...

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Abstract

The invention discloses a manufacturing method for double-roll cooled rare earth permanent magnet rapidly hardened alloy. The manufacturing method comprises the following steps of heating, fusing and refining neodymium iron boron raw materials into fused alloy liquid under a vacuum or protection condition; pouring the alloy liquid to the outer edge of a first water-cooled rotating roll through a gap of a tundish to form an alloy plate; rotating the alloy plate along with the first rotating roll; separating the alloy plate from the first rotating roll so that the alloy plate drops to the outer edge of a second water-cooled rotating roll; rotating the alloy plate along with the second rotating roll; and separating the alloy plate from the second rotating roll so that the alloy plate drops to form a double-surface-cooled alloy plate. The neodymium iron boron permanent magnet which is made of the alloy has R2T14Q main phases and grain boundary phases, wherein R is selected from elements of Pr, Nd, Dy, La, Ce, Gd, Tb and Ho; T is selected from elements of Fe, Co, Al and Mn; Q is selected from elements of B, N and C; the main phases are isolated from one another by the grain boundary phases; and oxides and nitrides of Pr and Nd are distributed in the grain boundary phases.

Description

technical field [0001] The invention belongs to the field of rare-earth permanent magnets, and in particular relates to a manufacturing method of a double-roller cooled rare-earth permanent-magnet quick-setting alloy, a neodymium-iron-boron rare-earth permanent magnet and a manufacturing method thereof. Background technique [0002] NdFeB rare earth permanent magnet materials, with their excellent magnetic properties, have been used more and more, and are widely used in medical nuclear magnetic resonance imaging, computer hard drives, audio, mobile phones, etc.; with the requirements of energy saving and low-carbon economy , NdFeB rare earth permanent magnet materials have begun to be used in auto parts, household appliances, energy saving and control motors, hybrid vehicles, wind power generation and other fields. [0003] U.S. Patent No. 7,585, the manufacture method of the disclosed neodymium-iron-boron rare earth permanent magnet vacuum quick-setting alloy of 378, this m...

Claims

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Application Information

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IPC IPC(8): B22D11/06H01F41/02H01F1/057
Inventor 孙宝玉洪光伟王健杨永泽段永利
Owner SHENYANG GENERAL MAGNETIC
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