A method for increasing the coercive force of rare earth magnets
A rare-earth magnet and coercive force technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as increasing costs, and achieve the effects of saving costs, improving coercive force, and high performance
Active Publication Date: 2019-11-19
BEIJING ZHONG KE SAN HUAN HI TECH
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Problems solved by technology
[0007] The invention provides a method for improving the coercive force of rare earth magnets to solve the problem that the prior art uses more expensive rare earth elements to increase the cost, and if the rare earth elements are not used, an additional process other than the conventional grain boundary diffusion process is required. equipment problem
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0059] Step 101, preparing a pre-sintered magnet, wherein the density of the pre-sintered magnet is lower than 7.9g / cm 3 ;
[0060] The alloy is smelted by conventional methods to obtain (Nd,Pr) 8 (Fe,Co) 85 B 7 The main phase alloy A1 strip and (Nd,Dy,Y) 16 (Fe,Co) 71.3 B 5.7 (Cu,Al) 7 Auxiliary alloy A2 ingot block, the alloy A1 and A2 were subjected to mechanical coarse crushing, hydrogen crushing, and jet milling respectively to obtain the main phase alloy A1 powder D50 of 7.5 μm, and the auxiliary alloy A2 powder D50 of 2 μm; and then the above two powders Fully mixed at a mass percentage of 85:15, sintered at 1000°C, 1020°C, and 1030°C for 5 hours after 2.0T orientation magnetic field orientation pressing, 180MPa isostatic pressing, and green body to obtain pre-sintered magnets a1, a2, and a3. The pre-sintered magnet is cut and ground to remove scale, and then the surface is cleaned with lye to obtain a Φ8×7mm cylindrical substrate magnet.
[0061] Step 102, prep...
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Abstract
The invention discloses a method for improving the rare earth magnet coercivity. The method comprises the following steps that 101, a presintered magnet is prepared, wherein the density of the presintered magnet is lower than 7.9 g / cm<3>; 102, a diffusion coating solution is prepared, wherein the diffusion coating solution does not contain heavy rare earth elements; 103, the presintered magnet is coated with the diffusion coating solution; 104, the presintered magnet is subjected to heat treatment. According to the method for improving the rare earth magnet coercivity, precious rare earth elements are not needed, additional equipment except for an ordinary grain boundary diffusion technology is not needed, and the residual magnetism and the square degree of the magnet are not lowered or lowered very little.
Description
technical field [0001] The invention belongs to the technical field of rare earth magnets, in particular to a method for increasing the coercive force of rare earth magnets. Background technique [0002] Sintered NdFeB magnets have excellent magnetic properties and are widely used in electronic information, automobile industry, medical equipment, energy and transportation and other fields. In recent years, sintered NdFeB magnets have new applications in energy-saving and environmental protection fields such as wind power generation, energy-saving home appliances, hybrid electric vehicles, and pure electric vehicles. Many of these applications require magnets to have better heat resistance, that is, magnets are required not only to have a high maximum energy product (BH)max, but also to have high intrinsic coercive force Hcj and squareness. The squareness of the magnet refers to the ratio of the applied magnetic field point Hk corresponding to 90% of the remanence Br on the ...
Claims
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IPC IPC(8): H01F41/02C21D1/773C21D1/74C21D1/00
CPCC21D1/00C21D1/74C21D1/773H01F41/0253H01F41/0273H01F41/0293
Inventor 叶选涨
Owner BEIJING ZHONG KE SAN HUAN HI TECH