Sintered NdFeB magnet having high integral magnetic performance and preparation method thereof
A technology of neodymium iron boron and magnetic properties, which is applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc. Difficult to control and other problems, to achieve the effect of high internal bonding force, good magnetic properties, and improved adhesion
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Embodiment 1
[0022] Example 1: Based on No. 52SH magnet
[0023] A preparation method of sintered NdFeB magnet with high comprehensive magnetic properties:
[0024] S1. Magnet surface pretreatment;
[0025] S2, uniformly spraying a layer of homogenized slurry containing heavy rare earth elements, adhesion improver and plasticizer on the surface of the pretreated magnet;
[0026] S3. Place the spray plate with the magnet coded in S2 in a tunnel-type drying tunnel and bake at 40°C for 2 minutes;
[0027] S4. Form a layer of flexible coating with a thickness of 20 μm on the surface of the sintered NdFeB magnet, and then subject the magnet evenly coated with the flexible coating to high-temperature diffusion heat treatment and low-temperature tempering treatment.
[0028] The magnet pretreatment method in the S1 is to use a self-made derusting agent to derust the surface of the magnetic steel, and then use 3% HNO 3 Pickling in alcohol solution for 30S, then ultrasonic cleaning in clean wate...
Embodiment 2
[0035] Embodiment 2: Based on No. 52SHT magnet
[0036] A preparation method of sintered NdFeB magnet with high comprehensive magnetic properties:
[0037] S1. Magnet surface pretreatment;
[0038] S2, uniformly spraying a layer of homogenized slurry containing heavy rare earth elements, adhesion improver and plasticizer on the surface of the pretreated magnet;
[0039] S3. Place the spray plate with the magnet coded in S2 in a tunnel-type drying tunnel and keep warm at 70°C for 3 minutes;
[0040] S4. A layer of flexible coating with a thickness of 510 μm is formed on the surface of the sintered NdFeB magnet, and then the magnet evenly coated with the flexible coating is subjected to high-temperature diffusion heat treatment and low-temperature tempering treatment.
[0041] The magnet pretreatment method in the S1 is to use a self-made derusting agent to derust the surface of the magnetic steel, and then use 3% HNO 3 Pickling in alcohol solution for 45S, then ultrasonicall...
Embodiment 3
[0048] Embodiment 3: Based on No. 50UH magnet
[0049] A preparation method of sintered NdFeB magnet with high comprehensive magnetic properties:
[0050] S1. Magnet surface pretreatment;
[0051] S2, uniformly spraying a layer of homogenized slurry containing heavy rare earth elements, adhesion improver and plasticizer on the surface of the pretreated magnet;
[0052] S3. Place the spray plate with the magnet coded in S2 in a tunnel-type drying tunnel and keep it warm at 100°C for 5 minutes;
[0053] S4. Forming a layer of flexible coating with a thickness of 1000 μm on the surface of the sintered NdFeB magnet, and then subjecting the magnet evenly coated with the flexible coating to high-temperature diffusion heat treatment and low-temperature tempering treatment.
[0054] The magnet pretreatment method in the S1 is to use a self-made derusting agent to derust the surface of the magnetic steel, and then use 3% HNO 3 Pickling in alcohol solution for 60S, then ultrasonic cl...
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